chore: bump version to 1.0.6+28082025

canada health values

WEBDAV_SYNC_IMPLEMENTATION.md

@@ -1,287 +0,0 @@
-# WebDAV Cloud Sync Implementation
-
-## Overview
-
-This document describes the WebDAV cloud sync implementation for the Supplements Tracker Flutter app. The implementation allows users to synchronize their supplement data across multiple devices using WebDAV-compatible servers like Nextcloud, ownCloud, or any standard WebDAV server.
-
-## Architecture
-
-### Core Components
-
-#### 1. Data Models Enhanced with Sync Metadata
-
-All core data models (`Supplement`, `SupplementIntake`, `Ingredient`) have been enhanced with sync metadata:
-
-- `syncId: String` - Unique identifier for sync operations (UUID)
-- `lastModified: DateTime` - Timestamp of last modification
-- `syncStatus: SyncStatus` - Current sync state (pending, synced, modified, conflict, etc.)
-- `isDeleted: bool` - Soft delete flag for sync purposes
-
-#### 2. Sync Enumerations (`lib/models/sync_enums.dart`)
-
-- `SyncStatus` - Track individual record sync states
-- `SyncOperationStatus` - Overall sync operation states
-- `ConflictResolutionStrategy` - How to handle conflicts
-- `SyncFrequency` - Auto-sync timing options
-- `ConflictType` - Types of sync conflicts
-
-#### 3. Sync Data Models (`lib/models/sync_data.dart`)
-
-- `SyncData` - Complete data structure for WebDAV JSON format
-- `SyncConflict` - Represents conflicts between local and remote data
-- `SyncResult` - Results and statistics from sync operations
-- `SyncStatistics` - Detailed sync operation metrics
-
-#### 4. WebDAV Sync Service (`lib/services/webdav_sync_service.dart`)
-
-Core service handling WebDAV communication:
-- Server configuration and authentication
-- Data upload/download operations
-- Conflict detection and basic resolution
-- Network connectivity checking
-- Device identification
-
-#### 5. Sync Provider (`lib/providers/sync_provider.dart`)
-
-State management layer for sync operations:
-- Manages sync status and progress
-- Handles user configuration
-- Coordinates between WebDAV service and UI
-- Manages conflict resolution workflow
-
-#### 6. UI Components
-
-- `SyncSettingsScreen` - Complete WebDAV configuration interface
-- Integration with existing settings screen
-- Real-time sync status indicators
-- Conflict resolution dialogs
-
-### Database Schema Changes
-
-The database has been upgraded to version 6 with sync support:
-
-```sql
--- New sync columns added to existing tables
-ALTER TABLE supplements ADD COLUMN syncId TEXT NOT NULL UNIQUE;
-ALTER TABLE supplements ADD COLUMN lastModified TEXT NOT NULL;
-ALTER TABLE supplements ADD COLUMN syncStatus TEXT NOT NULL DEFAULT 'pending';
-ALTER TABLE supplements ADD COLUMN isDeleted INTEGER NOT NULL DEFAULT 0;
-
--- Similar columns added to supplement_intakes table
-
--- New sync metadata table
-CREATE TABLE sync_metadata (
-  id INTEGER PRIMARY KEY AUTOINCREMENT,
-  key TEXT NOT NULL UNIQUE,
-  value TEXT NOT NULL,
-  lastUpdated TEXT NOT NULL
-);
-
--- Device info table for multi-device conflict resolution
-CREATE TABLE device_info (
-  id INTEGER PRIMARY KEY AUTOINCREMENT,
-  deviceId TEXT NOT NULL UNIQUE,
-  deviceName TEXT NOT NULL,
-  lastSyncTime TEXT,
-  createdAt TEXT NOT NULL
-);
-```
-
-## Sync Process Flow
-
-### 1. Configuration Phase
-1. User enters WebDAV server URL, username, and password/app password
-2. System tests connection and validates credentials
-3. Creates sync directory on server if needed
-4. Stores encrypted credentials locally using `flutter_secure_storage`
-
-### 2. Sync Operation
-1. Check network connectivity
-2. Download remote sync data (JSON file from WebDAV)
-3. Compare with local data using timestamps and sync IDs
-4. Detect conflicts (modification, deletion, creation conflicts)
-5. Merge data according to conflict resolution strategy
-6. Upload merged data back to server
-7. Update local sync status
-
-### 3. Conflict Resolution
-- **Last-write-wins**: Prefer most recently modified record
-- **Prefer Local**: Always keep local changes
-- **Prefer Remote**: Always keep remote changes
-- **Manual**: Present conflicts to user for individual resolution
-
-## Security Considerations
-
-### Data Protection
-- Credentials stored using `flutter_secure_storage` with platform encryption
-- Support for app passwords instead of main account passwords
-- No sensitive data logged in release builds
-
-### Network Security
-- HTTPS enforced for WebDAV connections
-- Connection testing before storing credentials
-- Proper error handling for authentication failures
-
-## Supported WebDAV Servers
-
-### Tested Compatibility
-- **Nextcloud** - Full compatibility with automatic path detection
-- **ownCloud** - Full compatibility with automatic path detection
-- **Generic WebDAV** - Manual path configuration required
-
-### Server Requirements
-- WebDAV protocol support
-- File read/write permissions
-- Directory creation permissions
-- Basic or digest authentication
-
-## Data Synchronization Format
-
-### JSON Structure
-```json
-{
-  "version": 1,
-  "deviceId": "device_12345_67890",
-  "deviceName": "John's Phone",
-  "syncTimestamp": "2024-01-15T10:30:00.000Z",
-  "supplements": [
-    {
-      "syncId": "uuid-supplement-1",
-      "name": "Vitamin D3",
-      "ingredients": [...],
-      "lastModified": "2024-01-15T09:15:00.000Z",
-      "syncStatus": "synced",
-      "isDeleted": false,
-      // ... other supplement fields
-    }
-  ],
-  "intakes": [
-    {
-      "syncId": "uuid-intake-1",
-      "supplementId": 1,
-      "takenAt": "2024-01-15T08:00:00.000Z",
-      "lastModified": "2024-01-15T08:00:30.000Z",
-      "syncStatus": "synced",
-      "isDeleted": false,
-      // ... other intake fields
-    }
-  ],
-  "metadata": {
-    "totalSupplements": 5,
-    "totalIntakes": 150
-  }
-}
-```
-
-## Usage Instructions
-
-### Initial Setup
-1. Navigate to Settings → Cloud Sync
-2. Enter your WebDAV server details:
-   - Server URL (e.g., `https://cloud.example.com`)
-   - Username
-   - Password or app password
-   - Optional device name
-3. Test connection
-4. Configure sync preferences
-
-### Sync Options
-- **Manual Sync**: Sync on demand via button press
-- **Auto Sync**: Automatic background sync at configured intervals
-  - Every 15 minutes
-  - Hourly
-  - Every 6 hours
-  - Daily
-
-### Conflict Resolution
-- Configure preferred resolution strategy in settings
-- Review individual conflicts when they occur
-- Auto-resolve based on chosen strategy
-
-## Implementation Status
-
-### ✅ Completed (Phase 1)
-- Core sync architecture and data models
-- WebDAV service implementation
-- Database schema with sync support
-- Basic UI for configuration and management
-- Manual sync operations
-- Conflict detection
-- Secure credential storage
-
-### 🔄 Future Enhancements (Phase 2+)
-- Background sync scheduling
-- Advanced conflict resolution UI
-- Sync history and logs
-- Client-side encryption option
-- Multiple server support
-- Bandwidth optimization
-- Offline queue management
-
-## Dependencies Added
-
-```yaml
-dependencies:
-  webdav_client: ^1.2.2      # WebDAV protocol client
-  connectivity_plus: ^6.0.5   # Network connectivity checking
-  flutter_secure_storage: ^9.2.2  # Secure credential storage
-  uuid: ^4.5.0               # UUID generation for sync IDs
-  crypto: ^3.0.5             # Data integrity verification
-```
-
-## File Structure
-
-```
-lib/
-├── models/
-│   ├── sync_enums.dart           # Sync-related enumerations
-│   ├── sync_data.dart            # Sync data models
-│   ├── supplement.dart           # Enhanced with sync metadata
-│   ├── supplement_intake.dart    # Enhanced with sync metadata
-│   └── ingredient.dart           # Enhanced with sync metadata
-├── services/
-│   ├── webdav_sync_service.dart  # WebDAV communication
-│   └── database_helper.dart      # Enhanced with sync methods
-├── providers/
-│   └── sync_provider.dart        # Sync state management
-└── screens/
-    └── sync_settings_screen.dart # Sync configuration UI
-```
-
-## Error Handling
-
-The implementation includes comprehensive error handling for:
-- Network connectivity issues
-- Authentication failures
-- Server unavailability
-- Malformed sync data
-- Storage permission issues
-- Conflicting concurrent modifications
-
-## Testing Recommendations
-
-### Unit Tests
-- Sync data serialization/deserialization
-- Conflict detection algorithms
-- Merge logic validation
-
-### Integration Tests
-- WebDAV server communication
-- Database sync operations
-- Cross-device sync scenarios
-
-### User Testing
-- Multi-device sync workflows
-- Network interruption recovery
-- Large dataset synchronization
-- Conflict resolution user experience
-
-## Performance Considerations
-
-- Incremental sync (only changed data)
-- Compression for large datasets
-- Connection timeout handling
-- Memory-efficient JSON processing
-- Background processing for large operations
-
-This implementation provides a solid foundation for cloud synchronization while maintaining data integrity and user experience across multiple devices.

assets/canada_health.json

@@ -0,0 +1,896 @@
+{
+  "source": "Health Canada Dietary Reference Intakes (vitamins & elements)",
+  "note": "Values come from Health Canada DRI tables. rda_type denotes whether the value is an RDA or an AI as published.",
+  "nutrients": {
+    "vitamin_a": {
+      "unit": "µg/day (RAE)",
+      "rda_type": "RDA/AI",
+      "life_stages": [
+        { "age_range": "0-6 mo", "sex": "infant", "value": 400, "ul": 600 },
+        { "age_range": "7-12 mo", "sex": "infant", "value": 500, "ul": 600 },
+        { "age_range": "1-3 y", "sex": "both", "value": 300, "ul": 600 },
+        { "age_range": "4-8 y", "sex": "both", "value": 400, "ul": 900 },
+        { "age_range": "9-13 y", "sex": "male", "value": 600, "ul": 1700 },
+        { "age_range": "9-13 y", "sex": "female", "value": 600, "ul": 1700 },
+        { "age_range": "14-18 y", "sex": "male", "value": 900, "ul": 2800 },
+        { "age_range": "14-18 y", "sex": "female", "value": 700, "ul": 2800 },
+        { "age_range": "19-30 y", "sex": "male", "value": 900, "ul": 3000 },
+        { "age_range": "19-30 y", "sex": "female", "value": 700, "ul": 3000 },
+        { "age_range": "31-50 y", "sex": "male", "value": 900, "ul": 3000 },
+        { "age_range": "31-50 y", "sex": "female", "value": 700, "ul": 3000 },
+        { "age_range": "51-70 y", "sex": "male", "value": 900, "ul": 3000 },
+        { "age_range": "51-70 y", "sex": "female", "value": 700, "ul": 3000 },
+        { "age_range": ">70 y", "sex": "male", "value": 900, "ul": 3000 },
+        { "age_range": ">70 y", "sex": "female", "value": 700, "ul": 3000 },
+        {
+          "age_range": "pregnancy ≤18 y",
+          "sex": "female",
+          "value": 750,
+          "ul": 2800
+        },
+        {
+          "age_range": "pregnancy 19-30 y",
+          "sex": "female",
+          "value": 770,
+          "ul": 3000
+        },
+        {
+          "age_range": "lactation ≤18 y",
+          "sex": "female",
+          "value": 1200,
+          "ul": 2800
+        },
+        {
+          "age_range": "lactation 19-30 y",
+          "sex": "female",
+          "value": 1300,
+          "ul": 3000
+        }
+      ]
+    },
+    "vitamin_c": {
+      "unit": "mg/day",
+      "rda_type": "RDA/AI",
+      "life_stages": [
+        { "age_range": "0-6 mo", "sex": "infant", "value": 40, "ul": null },
+        { "age_range": "7-12 mo", "sex": "infant", "value": 50, "ul": null },
+        { "age_range": "1-3 y", "sex": "both", "value": 15, "ul": 400 },
+        { "age_range": "4-8 y", "sex": "both", "value": 25, "ul": 650 },
+        { "age_range": "9-13 y", "sex": "male", "value": 45, "ul": 1200 },
+        { "age_range": "9-13 y", "sex": "female", "value": 45, "ul": 1200 },
+        { "age_range": "14-18 y", "sex": "male", "value": 75, "ul": 1800 },
+        { "age_range": "14-18 y", "sex": "female", "value": 65, "ul": 1800 },
+        { "age_range": "19-30 y", "sex": "male", "value": 75, "ul": 1800 },
+        { "age_range": "19-30 y", "sex": "female", "value": 90, "ul": 2000 },
+        { "age_range": "31-50 y", "sex": "male", "value": 75, "ul": 2000 },
+        { "age_range": "31-50 y", "sex": "female", "value": 75, "ul": 2000 },
+        { "age_range": "51-70 y", "sex": "both", "value": 75, "ul": 2000 },
+        { "age_range": ">70 y", "sex": "both", "value": 75, "ul": 2000 },
+        {
+          "age_range": "pregnancy ≤18 y",
+          "sex": "female",
+          "value": 80,
+          "ul": 1800
+        },
+        {
+          "age_range": "pregnancy 19-30 y",
+          "sex": "female",
+          "value": 85,
+          "ul": 2000
+        },
+        {
+          "age_range": "lactation ≤18 y",
+          "sex": "female",
+          "value": 115,
+          "ul": 1800
+        },
+        {
+          "age_range": "lactation 19-30 y",
+          "sex": "female",
+          "value": 120,
+          "ul": 2000
+        }
+      ]
+    },
+    "vitamin_d": {
+      "unit": "µg/day",
+      "rda_type": "RDA/AI",
+      "life_stages": [
+        { "age_range": "0-6 mo", "sex": "infant", "value": 10, "ul": 25 },
+        { "age_range": "7-12 mo", "sex": "infant", "value": 15, "ul": 25 },
+        { "age_range": "1-3 y", "sex": "both", "value": 15, "ul": 50 },
+        { "age_range": "4-8 y", "sex": "both", "value": 15, "ul": 50 },
+        { "age_range": "9-13 y", "sex": "both", "value": 15, "ul": 100 },
+        { "age_range": "14-18 y", "sex": "both", "value": 15, "ul": 100 },
+        { "age_range": "19-30 y", "sex": "both", "value": 15, "ul": 100 },
+        { "age_range": "31-50 y", "sex": "both", "value": 15, "ul": 100 },
+        { "age_range": "51-70 y", "sex": "both", "value": 20, "ul": 100 },
+        { "age_range": ">70 y", "sex": "both", "value": 20, "ul": 100 },
+        {
+          "age_range": "pregnancy ≤18 y",
+          "sex": "female",
+          "value": 15,
+          "ul": 100
+        },
+        {
+          "age_range": "pregnancy 19-30 y",
+          "sex": "female",
+          "value": 15,
+          "ul": 100
+        },
+        {
+          "age_range": "lactation ≤18 y",
+          "sex": "female",
+          "value": 15,
+          "ul": 100
+        },
+        {
+          "age_range": "lactation 19-30 y",
+          "sex": "female",
+          "value": 15,
+          "ul": 100
+        }
+      ]
+    },
+    "vitamin_e": {
+      "unit": "mg/day (alpha-tocopherol)",
+      "rda_type": "RDA/AI",
+      "life_stages": [
+        { "age_range": "0-6 mo", "sex": "infant", "value": 4, "ul": null },
+        { "age_range": "7-12 mo", "sex": "infant", "value": 5, "ul": null },
+        { "age_range": "1-3 y", "sex": "both", "value": 6, "ul": 200 },
+        { "age_range": "4-8 y", "sex": "both", "value": 7, "ul": 300 },
+        { "age_range": "9-13 y", "sex": "both", "value": 11, "ul": 600 },
+        { "age_range": "14-18 y", "sex": "both", "value": 15, "ul": 800 },
+        { "age_range": "19-30 y", "sex": "both", "value": 15, "ul": 800 },
+        { "age_range": "31-50 y", "sex": "both", "value": 15, "ul": 800 },
+        { "age_range": "51-70 y", "sex": "both", "value": 15, "ul": 800 },
+        { "age_range": ">70 y", "sex": "both", "value": 15, "ul": 800 },
+        {
+          "age_range": "pregnancy ≤18 y",
+          "sex": "female",
+          "value": 19,
+          "ul": 800
+        },
+        {
+          "age_range": "pregnancy 19-30 y",
+          "sex": "female",
+          "value": 19,
+          "ul": 800
+        },
+        {
+          "age_range": "lactation ≤18 y",
+          "sex": "female",
+          "value": 19,
+          "ul": 800
+        },
+        {
+          "age_range": "lactation 19-30 y",
+          "sex": "female",
+          "value": 19,
+          "ul": 800
+        }
+      ]
+    },
+    "vitamin_k": {
+      "unit": "µg/day",
+      "rda_type": "AI",
+      "life_stages": [
+        { "age_range": "0-6 mo", "sex": "infant", "value": 2, "ul": null },
+        { "age_range": "7-12 mo", "sex": "infant", "value": 2.5, "ul": null },
+        { "age_range": "1-3 y", "sex": "both", "value": 30, "ul": null },
+        { "age_range": "4-8 y", "sex": "both", "value": 55, "ul": null },
+        { "age_range": "9-13 y", "sex": "both", "value": 60, "ul": null },
+        { "age_range": "14-18 y", "sex": "male", "value": 75, "ul": null },
+        { "age_range": "14-18 y", "sex": "female", "value": 75, "ul": null },
+        { "age_range": "19-30 y", "sex": "male", "value": 75, "ul": null },
+        { "age_range": "19-30 y", "sex": "female", "value": 75, "ul": null },
+        { "age_range": "31-50 y", "sex": "male", "value": 75, "ul": null },
+        { "age_range": "31-50 y", "sex": "female", "value": 75, "ul": null },
+        { "age_range": "51-70 y", "sex": "male", "value": 75, "ul": null },
+        { "age_range": "51-70 y", "sex": "female", "value": 75, "ul": null },
+        { "age_range": ">70 y", "sex": "male", "value": 75, "ul": null },
+        { "age_range": ">70 y", "sex": "female", "value": 75, "ul": null },
+        {
+          "age_range": "pregnancy ≤18 y",
+          "sex": "female",
+          "value": 75,
+          "ul": null
+        },
+        {
+          "age_range": "pregnancy 19-30 y",
+          "sex": "female",
+          "value": 75,
+          "ul": null
+        },
+        {
+          "age_range": "lactation ≤18 y",
+          "sex": "female",
+          "value": 75,
+          "ul": null
+        },
+        {
+          "age_range": "lactation 19-30 y",
+          "sex": "female",
+          "value": 75,
+          "ul": null
+        }
+      ]
+    },
+    "vitamin_b1": {
+      "unit": "mg/day",
+      "rda_type": "RDA/AI",
+      "life_stages": [
+        { "age_range": "0-6 mo", "sex": "infant", "value": 0.2, "ul": null },
+        { "age_range": "7-12 mo", "sex": "infant", "value": 0.3, "ul": null },
+        { "age_range": "1-3 y", "sex": "both", "value": 0.5, "ul": null },
+        { "age_range": "4-8 y", "sex": "both", "value": 0.6, "ul": null },
+        { "age_range": "9-13 y", "sex": "male", "value": 0.9, "ul": null },
+        { "age_range": "9-13 y", "sex": "female", "value": 0.9, "ul": null },
+        { "age_range": "14-18 y", "sex": "male", "value": 1.2, "ul": null },
+        { "age_range": "14-18 y", "sex": "female", "value": 1.0, "ul": null },
+        { "age_range": "19-30 y", "sex": "male", "value": 1.2, "ul": null },
+        { "age_range": "19-30 y", "sex": "female", "value": 1.1, "ul": null },
+        { "age_range": "31-50 y", "sex": "male", "value": 1.2, "ul": null },
+        { "age_range": "31-50 y", "sex": "female", "value": 1.1, "ul": null },
+        { "age_range": "51-70 y", "sex": "male", "value": 1.2, "ul": null },
+        { "age_range": "51-70 y", "sex": "female", "value": 1.1, "ul": null },
+        { "age_range": ">70 y", "sex": "male", "value": 1.2, "ul": null },
+        { "age_range": ">70 y", "sex": "female", "value": 1.1, "ul": null },
+        {
+          "age_range": "pregnancy ≤18 y",
+          "sex": "female",
+          "value": 1.4,
+          "ul": null
+        },
+        {
+          "age_range": "pregnancy 19-30 y",
+          "sex": "female",
+          "value": 1.4,
+          "ul": null
+        },
+        {
+          "age_range": "lactation ≤18 y",
+          "sex": "female",
+          "value": 1.5,
+          "ul": null
+        },
+        {
+          "age_range": "lactation 19-30 y",
+          "sex": "female",
+          "value": 1.5,
+          "ul": null
+        }
+      ]
+    },
+    "vitamin_b2": {
+      "unit": "mg/day",
+      "rda_type": "RDA/AI",
+      "life_stages": [
+        { "age_range": "0-6 mo", "sex": "infant", "value": 0.3, "ul": null },
+        { "age_range": "7-12 mo", "sex": "infant", "value": 0.4, "ul": null },
+        { "age_range": "1-3 y", "sex": "both", "value": 0.5, "ul": null },
+        { "age_range": "4-8 y", "sex": "both", "value": 0.6, "ul": null },
+        { "age_range": "9-13 y", "sex": "male", "value": 0.9, "ul": null },
+        { "age_range": "9-13 y", "sex": "female", "value": 0.9, "ul": null },
+        { "age_range": "14-18 y", "sex": "male", "value": 1.3, "ul": null },
+        { "age_range": "14-18 y", "sex": "female", "value": 1.0, "ul": null },
+        { "age_range": "19-30 y", "sex": "male", "value": 1.3, "ul": null },
+        { "age_range": "19-30 y", "sex": "female", "value": 1.1, "ul": null },
+        { "age_range": "31-50 y", "sex": "male", "value": 1.3, "ul": null },
+        { "age_range": "31-50 y", "sex": "female", "value": 1.1, "ul": null },
+        { "age_range": "51-70 y", "sex": "male", "value": 1.3, "ul": null },
+        { "age_range": "51-70 y", "sex": "female", "value": 1.1, "ul": null },
+        { "age_range": ">70 y", "sex": "male", "value": 1.3, "ul": null },
+        { "age_range": ">70 y", "sex": "female", "value": 1.1, "ul": null },
+        {
+          "age_range": "pregnancy ≤18 y",
+          "sex": "female",
+          "value": 1.4,
+          "ul": null
+        },
+        {
+          "age_range": "pregnancy 19-30 y",
+          "sex": "female",
+          "value": 1.4,
+          "ul": null
+        },
+        {
+          "age_range": "lactation ≤18 y",
+          "sex": "female",
+          "value": 1.6,
+          "ul": null
+        },
+        {
+          "age_range": "lactation 19-30 y",
+          "sex": "female",
+          "value": 1.6,
+          "ul": null
+        }
+      ]
+    },
+    "vitamin_b3": {
+      "unit": "mg/day (niacin equivalents, NE)",
+      "rda_type": "RDA/AI",
+      "life_stages": [
+        { "age_range": "0-6 mo", "sex": "infant", "value": 2, "ul": null },
+        { "age_range": "7-12 mo", "sex": "infant", "value": 4, "ul": null },
+        { "age_range": "1-3 y", "sex": "both", "value": 6, "ul": 10 },
+        { "age_range": "4-8 y", "sex": "both", "value": 8, "ul": 15 },
+        { "age_range": "9-13 y", "sex": "both", "value": 12, "ul": 20 },
+        { "age_range": "14-18 y", "sex": "male", "value": 16, "ul": 30 },
+        { "age_range": "14-18 y", "sex": "female", "value": 14, "ul": 30 },
+        { "age_range": "19-30 y", "sex": "male", "value": 16, "ul": 35 },
+        { "age_range": "19-30 y", "sex": "female", "value": 14, "ul": 35 },
+        { "age_range": "31-50 y", "sex": "male", "value": 16, "ul": 35 },
+        { "age_range": "31-50 y", "sex": "female", "value": 14, "ul": 35 },
+        { "age_range": "51-70 y", "sex": "male", "value": 16, "ul": 35 },
+        { "age_range": "51-70 y", "sex": "female", "value": 14, "ul": 35 },
+        { "age_range": ">70 y", "sex": "male", "value": 16, "ul": 35 },
+        { "age_range": ">70 y", "sex": "female", "value": 14, "ul": 35 },
+        {
+          "age_range": "pregnancy ≤18 y",
+          "sex": "female",
+          "value": 18,
+          "ul": 35
+        },
+        {
+          "age_range": "pregnancy 19-30 y",
+          "sex": "female",
+          "value": 18,
+          "ul": 35
+        },
+        {
+          "age_range": "lactation ≤18 y",
+          "sex": "female",
+          "value": 17,
+          "ul": 35
+        },
+        {
+          "age_range": "lactation 19-30 y",
+          "sex": "female",
+          "value": 17,
+          "ul": 35
+        }
+      ]
+    },
+    "vitamin_b5": {
+      "unit": "mg/day",
+      "rda_type": "AI",
+      "life_stages": [
+        { "age_range": "0-6 mo", "sex": "infant", "value": 1.7, "ul": null },
+        { "age_range": "7-12 mo", "sex": "infant", "value": 1.8, "ul": null },
+        { "age_range": "1-3 y", "sex": "both", "value": 2.0, "ul": null },
+        { "age_range": "4-8 y", "sex": "both", "value": 3.0, "ul": null },
+        { "age_range": "9-13 y", "sex": "both", "value": 4.0, "ul": null },
+        { "age_range": "14-18 y", "sex": "both", "value": 5.0, "ul": null },
+        { "age_range": "19-30 y", "sex": "both", "value": 5.0, "ul": null },
+        { "age_range": "31-50 y", "sex": "both", "value": 5.0, "ul": null },
+        { "age_range": "51-70 y", "sex": "both", "value": 5.0, "ul": null },
+        { "age_range": ">70 y", "sex": "both", "value": 5.0, "ul": null },
+        {
+          "age_range": "pregnancy ≤18 y",
+          "sex": "female",
+          "value": 6.0,
+          "ul": null
+        },
+        {
+          "age_range": "pregnancy 19-30 y",
+          "sex": "female",
+          "value": 6.0,
+          "ul": null
+        },
+        {
+          "age_range": "pregnancy 31-50 y",
+          "sex": "female",
+          "value": 6.0,
+          "ul": null
+        },
+        {
+          "age_range": "lactation ≤18 y",
+          "sex": "female",
+          "value": 7.0,
+          "ul": null
+        },
+        {
+          "age_range": "lactation 19-30 y",
+          "sex": "female",
+          "value": 7.0,
+          "ul": null
+        },
+        {
+          "age_range": "lactation 31-50 y",
+          "sex": "female",
+          "value": 7.0,
+          "ul": null
+        }
+      ]
+    },
+    "vitamin_b6": {
+      "unit": "mg/day",
+      "rda_type": "RDA/AI",
+      "life_stages": [
+        { "age_range": "0-6 mo", "sex": "infant", "value": 0.1, "ul": null },
+        { "age_range": "7-12 mo", "sex": "infant", "value": 0.3, "ul": null },
+        { "age_range": "1-3 y", "sex": "both", "value": 0.5, "ul": 30 },
+        { "age_range": "4-8 y", "sex": "both", "value": 0.6, "ul": 40 },
+        { "age_range": "9-13 y", "sex": "both", "value": 1.0, "ul": 60 },
+        { "age_range": "14-18 y", "sex": "male", "value": 1.3, "ul": 80 },
+        { "age_range": "14-18 y", "sex": "female", "value": 1.2, "ul": 80 },
+        { "age_range": "19-50 y", "sex": "male", "value": 1.3, "ul": 100 },
+        { "age_range": "19-50 y", "sex": "female", "value": 1.3, "ul": 100 },
+        { "age_range": "51-70 y", "sex": "male", "value": 1.7, "ul": 100 },
+        { "age_range": "51-70 y", "sex": "female", "value": 1.5, "ul": 100 },
+        { "age_range": ">70 y", "sex": "male", "value": 1.7, "ul": 100 },
+        { "age_range": ">70 y", "sex": "female", "value": 1.5, "ul": 100 },
+        {
+          "age_range": "pregnancy ≤18 y",
+          "sex": "female",
+          "value": 1.9,
+          "ul": 80
+        },
+        {
+          "age_range": "pregnancy 19-30 y",
+          "sex": "female",
+          "value": 1.9,
+          "ul": 80
+        },
+        {
+          "age_range": "lactation ≤18 y",
+          "sex": "female",
+          "value": 2.0,
+          "ul": 100
+        },
+        {
+          "age_range": "lactation 19-30 y",
+          "sex": "female",
+          "value": 2.0,
+          "ul": 100
+        }
+      ]
+    },
+    "vitamin_b12": {
+      "unit": "µg/day",
+      "rda_type": "RDA/AI",
+      "life_stages": [
+        { "age_range": "0-6 mo", "sex": "infant", "value": 0.4, "ul": null },
+        { "age_range": "7-12 mo", "sex": "infant", "value": 0.5, "ul": null },
+        { "age_range": "1-3 y", "sex": "both", "value": 0.9, "ul": null },
+        { "age_range": "4-8 y", "sex": "both", "value": 1.2, "ul": null },
+        { "age_range": "9-13 y", "sex": "both", "value": 1.8, "ul": null },
+        { "age_range": "14-18 y", "sex": "both", "value": 2.4, "ul": null },
+        { "age_range": "19-30 y", "sex": "both", "value": 2.4, "ul": null },
+        { "age_range": "31-50 y", "sex": "both", "value": 2.4, "ul": null },
+        { "age_range": "51-70 y", "sex": "both", "value": 2.4, "ul": null },
+        { "age_range": ">70 y", "sex": "both", "value": 2.4, "ul": null },
+        {
+          "age_range": "pregnancy ≤18 y",
+          "sex": "female",
+          "value": 2.6,
+          "ul": null
+        },
+        {
+          "age_range": "pregnancy 19-30 y",
+          "sex": "female",
+          "value": 2.6,
+          "ul": null
+        },
+        {
+          "age_range": "lactation ≤18 y",
+          "sex": "female",
+          "value": 2.8,
+          "ul": null
+        },
+        {
+          "age_range": "lactation 19-30 y",
+          "sex": "female",
+          "value": 2.8,
+          "ul": null
+        }
+      ]
+    },
+    "iron": {
+      "unit": "mg/day",
+      "rda_type": "RDA/AI",
+      "life_stages": [
+        { "age_range": "0-6 mo", "sex": "infant", "value": 0.27, "ul": 40 },
+        { "age_range": "7-12 mo", "sex": "infant", "value": 11, "ul": 40 },
+        { "age_range": "1-3 y", "sex": "both", "value": 7, "ul": 40 },
+        { "age_range": "4-8 y", "sex": "both", "value": 10, "ul": 40 },
+        { "age_range": "9-13 y", "sex": "male", "value": 8, "ul": 45 },
+        { "age_range": "9-13 y", "sex": "female", "value": 8, "ul": 45 },
+        { "age_range": "14-18 y", "sex": "male", "value": 11, "ul": 45 },
+        { "age_range": "14-18 y", "sex": "female", "value": 15, "ul": 45 },
+        { "age_range": "19-30 y", "sex": "male", "value": 8, "ul": 45 },
+        { "age_range": "19-30 y", "sex": "female", "value": 18, "ul": 45 },
+        { "age_range": "31-50 y", "sex": "male", "value": 8, "ul": 45 },
+        { "age_range": "31-50 y", "sex": "female", "value": 18, "ul": 45 },
+        { "age_range": "51-70 y", "sex": "male", "value": 8, "ul": 45 },
+        { "age_range": "51-70 y", "sex": "female", "value": 8, "ul": 45 },
+        { "age_range": ">70 y", "sex": "male", "value": 8, "ul": 45 },
+        { "age_range": ">70 y", "sex": "female", "value": 8, "ul": 45 },
+        {
+          "age_range": "pregnancy ≤18 y",
+          "sex": "female",
+          "value": 27,
+          "ul": 45
+        },
+        {
+          "age_range": "pregnancy 19-30 y",
+          "sex": "female",
+          "value": 27,
+          "ul": 45
+        },
+        {
+          "age_range": "pregnancy 31-50 y",
+          "sex": "female",
+          "value": 27,
+          "ul": 45
+        },
+        {
+          "age_range": "lactation ≤18 y",
+          "sex": "female",
+          "value": 10,
+          "ul": 45
+        },
+        {
+          "age_range": "lactation 19-30 y",
+          "sex": "female",
+          "value": 9,
+          "ul": 45
+        },
+        {
+          "age_range": "lactation 31-50 y",
+          "sex": "female",
+          "value": 9,
+          "ul": 45
+        }
+      ]
+    },
+    "magnesium": {
+      "unit": "mg/day",
+      "rda_type": "RDA/AI",
+      "note": "UL represents intake from pharmacological agents only, not food or water.",
+      "life_stages": [
+        {
+          "age_range": "0-6 mo",
+          "sex": "infant",
+          "value": 30,
+          "rda_type": "AI",
+          "ul": 40
+        },
+        {
+          "age_range": "7-12 mo",
+          "sex": "infant",
+          "value": 75,
+          "rda_type": "AI",
+          "ul": 40
+        },
+        {
+          "age_range": "1-3 y",
+          "sex": "both",
+          "value": 80,
+          "rda_type": "RDA",
+          "ul": 65
+        },
+        {
+          "age_range": "4-8 y",
+          "sex": "both",
+          "value": 130,
+          "rda_type": "RDA",
+          "ul": 110
+        },
+        {
+          "age_range": "9-13 y",
+          "sex": "male",
+          "value": 240,
+          "rda_type": "RDA",
+          "ul": 350
+        },
+        {
+          "age_range": "9-13 y",
+          "sex": "female",
+          "value": 240,
+          "rda_type": "RDA",
+          "ul": 350
+        },
+        {
+          "age_range": "14-18 y",
+          "sex": "male",
+          "value": 410,
+          "rda_type": "RDA",
+          "ul": 350
+        },
+        {
+          "age_range": "14-18 y",
+          "sex": "female",
+          "value": 360,
+          "rda_type": "RDA",
+          "ul": 350
+        },
+        {
+          "age_range": "19-30 y",
+          "sex": "male",
+          "value": 400,
+          "rda_type": "RDA",
+          "ul": 350
+        },
+        {
+          "age_range": "19-30 y",
+          "sex": "female",
+          "value": 310,
+          "rda_type": "RDA",
+          "ul": 350
+        },
+        {
+          "age_range": "31-50 y",
+          "sex": "male",
+          "value": 420,
+          "rda_type": "RDA",
+          "ul": 350
+        },
+        {
+          "age_range": "31-50 y",
+          "sex": "female",
+          "value": 320,
+          "rda_type": "RDA",
+          "ul": 350
+        },
+        {
+          "age_range": "51-70 y",
+          "sex": "male",
+          "value": 420,
+          "rda_type": "RDA",
+          "ul": 350
+        },
+        {
+          "age_range": "51-70 y",
+          "sex": "female",
+          "value": 320,
+          "rda_type": "RDA",
+          "ul": 350
+        },
+        {
+          "age_range": ">70 y",
+          "sex": "male",
+          "value": 420,
+          "rda_type": "RDA",
+          "ul": 350
+        },
+        {
+          "age_range": ">70 y",
+          "sex": "female",
+          "value": 320,
+          "rda_type": "RDA",
+          "ul": 350
+        },
+        {
+          "age_range": "pregnancy ≤18 y",
+          "sex": "female",
+          "value": 400,
+          "rda_type": "RDA",
+          "ul": 350
+        },
+        {
+          "age_range": "pregnancy 19-30 y",
+          "sex": "female",
+          "value": 350,
+          "rda_type": "RDA",
+          "ul": 350
+        },
+        {
+          "age_range": "pregnancy 31-50 y",
+          "sex": "female",
+          "value": 360,
+          "rda_type": "RDA",
+          "ul": 350
+        },
+        {
+          "age_range": "lactation ≤18 y",
+          "sex": "female",
+          "value": 360,
+          "rda_type": "RDA",
+          "ul": 350
+        },
+        {
+          "age_range": "lactation 19-30 y",
+          "sex": "female",
+          "value": 320,
+          "rda_type": "RDA",
+          "ul": 350
+        },
+        {
+          "age_range": "lactation 31-50 y",
+          "sex": "female",
+          "value": 320,
+          "rda_type": "RDA",
+          "ul": 350
+        }
+      ]
+    },
+    "zinc": {
+      "unit": "mg/day",
+      "rda_type": "RDA/AI",
+      "life_stages": [
+        { "age_range": "0-6 mo", "sex": "infant", "value": 2, "ul": 4 },
+        { "age_range": "7-12 mo", "sex": "infant", "value": 3, "ul": 5 },
+        { "age_range": "1-3 y", "sex": "both", "value": 3, "ul": 7 },
+        { "age_range": "4-8 y", "sex": "both", "value": 5, "ul": 12 },
+        { "age_range": "9-13 y", "sex": "male", "value": 8, "ul": 23 },
+        { "age_range": "9-13 y", "sex": "female", "value": 8, "ul": 23 },
+        { "age_range": "14-18 y", "sex": "male", "value": 11, "ul": 34 },
+        { "age_range": "14-18 y", "sex": "female", "value": 9, "ul": 34 },
+        { "age_range": "19-30 y", "sex": "male", "value": 11, "ul": 40 },
+        { "age_range": "19-30 y", "sex": "female", "value": 8, "ul": 40 },
+        { "age_range": "31-50 y", "sex": "male", "value": 11, "ul": 40 },
+        { "age_range": "31-50 y", "sex": "female", "value": 8, "ul": 40 },
+        { "age_range": "51-70 y", "sex": "male", "value": 11, "ul": 40 },
+        { "age_range": "51-70 y", "sex": "female", "value": 8, "ul": 40 },
+        { "age_range": ">70 y", "sex": "male", "value": 11, "ul": 40 },
+        { "age_range": ">70 y", "sex": "female", "value": 8, "ul": 40 },
+        {
+          "age_range": "pregnancy ≤18 y",
+          "sex": "female",
+          "value": 12,
+          "ul": 40
+        },
+        {
+          "age_range": "pregnancy 19-30 y",
+          "sex": "female",
+          "value": 11,
+          "ul": 40
+        },
+        {
+          "age_range": "pregnancy 31-50 y",
+          "sex": "female",
+          "value": 11,
+          "ul": 40
+        },
+        {
+          "age_range": "lactation ≤18 y",
+          "sex": "female",
+          "value": 13,
+          "ul": 40
+        },
+        {
+          "age_range": "lactation 19-30 y",
+          "sex": "female",
+          "value": 12,
+          "ul": 40
+        },
+        {
+          "age_range": "lactation 31-50 y",
+          "sex": "female",
+          "value": 12,
+          "ul": 40
+        }
+      ]
+    },
+    "creatine": {
+      "unit": "g/day",
+      "rda_type": "Recommended Dosage",
+      "note": "Creatine monohydrate supplementation typically involves a loading phase of 20-25 g/day divided into 4-5 g doses for 5-7 days, followed by a maintenance dose of 3-5 g/day. The UL is not a strict daily maximum but based on safe dosages studied for various durations.",
+      "life_stages": [
+        {
+          "age_range": "adult",
+          "sex": "both",
+          "value_min": 3,
+          "value_max": 5,
+          "description": "Maintenance dose (typical daily intake)"
+        },
+        {
+          "age_range": "adult",
+          "sex": "both",
+          "value": 20,
+          "description": "Loading phase daily dose (divided into 4-5 g servings for 5-7 days)"
+        }
+      ],
+      "ul": {
+        "value": 25,
+        "unit": "g/day",
+        "duration": "up to 14 days",
+        "note": "Doses up to 25 g/day for up to 14 days have been safely used. Long-term doses of 3-5 g/day are considered safe."
+      }
+    },
+    "manganese": {
+      "unit": "mg/day",
+      "rda_type": "AI",
+      "life_stages": [
+        { "age_range": "0-6 mo", "sex": "infant", "value": 0.003, "ul": null },
+        { "age_range": "7-12 mo", "sex": "infant", "value": 0.6, "ul": null },
+        { "age_range": "1-3 y", "sex": "both", "value": 1.2, "ul": 2 },
+        { "age_range": "4-8 y", "sex": "both", "value": 1.5, "ul": 3 },
+        { "age_range": "9-13 y", "sex": "male", "value": 1.9, "ul": 6 },
+        { "age_range": "9-13 y", "sex": "female", "value": 1.6, "ul": 6 },
+        { "age_range": "14-18 y", "sex": "male", "value": 2.2, "ul": 9 },
+        { "age_range": "14-18 y", "sex": "female", "value": 1.6, "ul": 9 },
+        { "age_range": "19-30 y", "sex": "male", "value": 2.3, "ul": 11 },
+        { "age_range": "19-30 y", "sex": "female", "value": 1.8, "ul": 11 },
+        { "age_range": "31-50 y", "sex": "male", "value": 2.3, "ul": 11 },
+        { "age_range": "31-50 y", "sex": "female", "value": 1.8, "ul": 11 },
+        { "age_range": "51-70 y", "sex": "male", "value": 2.3, "ul": 11 },
+        { "age_range": "51-70 y", "sex": "female", "value": 1.8, "ul": 11 },
+        { "age_range": ">70 y", "sex": "male", "value": 2.3, "ul": 11 },
+        { "age_range": ">70 y", "sex": "female", "value": 1.8, "ul": 11 },
+        {
+          "age_range": "pregnancy ≤18 y",
+          "sex": "female",
+          "value": 1.9,
+          "ul": 11
+        },
+        {
+          "age_range": "pregnancy 19-30 y",
+          "sex": "female",
+          "value": 1.8,
+          "ul": 11
+        },
+        {
+          "age_range": "pregnancy 31-50 y",
+          "sex": "female",
+          "value": 1.8,
+          "ul": 11
+        },
+        {
+          "age_range": "lactation ≤18 y",
+          "sex": "female",
+          "value": 2.6,
+          "ul": 11
+        },
+        {
+          "age_range": "lactation 19-30 y",
+          "sex": "female",
+          "value": 2.3,
+          "ul": 11
+        },
+        {
+          "age_range": "lactation 31-50 y",
+          "sex": "female",
+          "value": 2.3,
+          "ul": 11
+        }
+      ]
+    },
+    "folate_dfe": {
+      "unit": "µg/day (DFE)",
+      "rda_type": "RDA/AI",
+      "life_stages": [
+        { "age_range": "0-6 mo", "sex": "infant", "value": 65, "ul": null },
+        { "age_range": "7-12 mo", "sex": "infant", "value": 80, "ul": null },
+        { "age_range": "1-3 y", "sex": "both", "value": 150, "ul": 300 },
+        { "age_range": "4-8 y", "sex": "both", "value": 200, "ul": 400 },
+        { "age_range": "9-13 y", "sex": "male", "value": 300, "ul": 600 },
+        { "age_range": "9-13 y", "sex": "female", "value": 300, "ul": 600 },
+        { "age_range": "14-18 y", "sex": "both", "value": 400, "ul": 800 },
+        { "age_range": "19-30 y", "sex": "female", "value": 400, "ul": 1000 },
+        { "age_range": "19-30 y", "sex": "male", "value": 400, "ul": 1000 },
+        { "age_range": "31-50 y", "sex": "both", "value": 400, "ul": 1000 },
+        { "age_range": "51-70 y", "sex": "both", "value": 400, "ul": 1000 },
+        { "age_range": ">70 y", "sex": "both", "value": 400, "ul": 1000 },
+        {
+          "age_range": "pregnancy ≤18 y",
+          "sex": "female",
+          "value": 600,
+          "ul": 800
+        },
+        {
+          "age_range": "pregnancy 19-30 y",
+          "sex": "female",
+          "value": 600,
+          "ul": 1000
+        },
+        {
+          "age_range": "lactation ≤18 y",
+          "sex": "female",
+          "value": 500,
+          "ul": 800
+        },
+        {
+          "age_range": "lactation 19-30 y",
+          "sex": "female",
+          "value": 500,
+          "ul": 1000
+        }
+      ]
+    }
+  }
+}

lib/data/rda_data.dart

@@ -0,0 +1,71 @@
+// Recommended Daily Allowances (RDA) for common vitamins and minerals.
+// All values are in milligrams (mg) unless otherwise specified.
+const Map<String, Map<String, Map<String, double>>> rdaData = {
+  'Vitamin C': {
+    'Male': {
+      '19-70': 90, // mg
+    },
+    'Female': {
+      '19-70': 75, // mg
+    },
+  },
+  'Vitamin D': {
+    'Male': {
+      '19-70': 15, // mcg
+    },
+    'Female': {
+      '19-70': 15, // mcg
+    },
+  },
+  'Vitamin D3': {
+    'Male': {
+      '19-70': 15, // mcg
+    },
+    'Female': {
+      '19-70': 15, // mcg
+    },
+  },
+  'Vitamin K': {
+    'Male': {
+      '19-100': 120, // mcg
+    },
+    'Female': {
+      '19-100': 90, // mcg
+    },
+  },
+  'Vitamin K2': {
+    'Male': {
+      '19-100': 120, // mcg
+    },
+    'Female': {
+      '19-100': 90, // mcg
+    },
+  },
+  'Calcium': {
+    'Male': {
+      '19-50': 1000, // mg
+      '51-70': 1000, // mg
+    },
+    'Female': {
+      '19-50': 1000, // mg
+      '51-70': 1200, // mg
+    },
+  },
+  'Iron': {
+    'Male': {
+      '19-50': 8, // mg
+    },
+    'Female': {
+      '19-50': 18, // mg
+      '51-70': 8, // mg
+    },
+  },
+  'DHA & EPA': {
+    'Male': {
+      '19-100': 250, // mg
+    },
+    'Female': {
+      '19-100': 250, // mg
+    },
+  },
+};

lib/main.dart

@@ -3,16 +3,23 @@ import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 
 import 'providers/settings_provider.dart';
-import 'providers/supplement_provider.dart';
 import 'providers/simple_sync_provider.dart';
+import 'providers/supplement_provider.dart';
 import 'screens/home_screen.dart';
+import 'screens/profile_setup_screen.dart';
 
-void main() {
-  runApp(const MyApp());
+void main() async {
+  WidgetsFlutterBinding.ensureInitialized();
+  final settingsProvider = SettingsProvider();
+  await settingsProvider.initialize();
+
+  runApp(MyApp(settingsProvider: settingsProvider));
 }
 
 class MyApp extends StatelessWidget {
-  const MyApp({super.key});
+  final SettingsProvider settingsProvider;
+
+  const MyApp({super.key, required this.settingsProvider});
 
   @override
   Widget build(BuildContext context) {
@@ -21,8 +28,8 @@ class MyApp extends StatelessWidget {
         ChangeNotifierProvider(
           create: (context) => SupplementProvider()..initialize(),
         ),
-        ChangeNotifierProvider(
-          create: (context) => SettingsProvider()..initialize(),
+        ChangeNotifierProvider.value(
+          value: settingsProvider,
         ),
         ChangeNotifierProvider(
           create: (context) => SimpleSyncProvider(),
@@ -31,8 +38,11 @@ class MyApp extends StatelessWidget {
       child: Consumer2<SettingsProvider, SimpleSyncProvider>(
         builder: (context, settingsProvider, syncProvider, child) {
           // Set up the sync completion callback to refresh supplement data
+          // and initialize auto-sync integration
           WidgetsBinding.instance.addPostFrameCallback((_) {
             final supplementProvider = context.read<SupplementProvider>();
+
+            // Set up sync completion callback
             syncProvider.setOnSyncCompleteCallback(() async {
               if (kDebugMode) {
                 print('SupplementsLog: Sync completed, refreshing UI data...');
@@ -43,6 +53,14 @@ class MyApp extends StatelessWidget {
                 print('SupplementsLog: UI data refreshed after sync');
               }
             });
+
+            // Initialize auto-sync service
+            syncProvider.initializeAutoSync(settingsProvider);
+
+            // Set up auto-sync callback for data changes
+            supplementProvider.setOnDataChangedCallback(() {
+              syncProvider.triggerAutoSyncIfEnabled();
+            });
           });
 
           return MaterialApp(
@@ -62,7 +80,9 @@ class MyApp extends StatelessWidget {
               useMaterial3: true,
             ),
             themeMode: settingsProvider.themeMode,
-            home: const HomeScreen(),
+            home: (settingsProvider.age == null || settingsProvider.gender == null)
+                ? const ProfileSetupScreen()
+                : const HomeScreen(),
             debugShowCheckedModeBanner: false,
           );
         },

lib/models/nutrient.dart

@@ -0,0 +1,87 @@
+
+
+class Nutrient {
+  final String name;
+  final String unit;
+  final String rdaType;
+  final String? note;
+  final UpperLimit? ul; // nutrient-level UL (optional)
+  final List<LifeStage> lifeStages;
+
+  Nutrient({
+    required this.name,
+    required this.unit,
+    required this.rdaType,
+    this.note,
+    this.ul,
+    required this.lifeStages,
+  });
+
+  factory Nutrient.fromJson(String name, Map<String, dynamic> json) {
+    return Nutrient(
+      name: name,
+      unit: json['unit'],
+      rdaType: json['rda_type'],
+      note: json['note'],
+      ul: (json['ul'] is Map<String, dynamic>) ? UpperLimit.fromJson(json['ul'] as Map<String, dynamic>) : null,
+      lifeStages: (json['life_stages'] as List)
+          .map((stage) => LifeStage.fromJson(stage))
+          .toList(),
+    );
+  }
+}
+
+class LifeStage {
+  final String ageRange;
+  final String sex;
+  final double value;
+  final double? valueMin;
+  final double? valueMax;
+  final double? ul;
+  final String? description;
+
+  LifeStage({
+    required this.ageRange,
+    required this.sex,
+    required this.value,
+    this.valueMin,
+    this.valueMax,
+    this.ul,
+    this.description,
+  });
+
+  factory LifeStage.fromJson(Map<String, dynamic> json) {
+    return LifeStage(
+      ageRange: json['age_range'],
+      sex: json['sex'],
+      value: (json['value'] as num?)?.toDouble() ?? 0.0,
+      valueMin: json['value_min'] != null ? (json['value_min'] as num).toDouble() : null,
+      valueMax: json['value_max'] != null ? (json['value_max'] as num).toDouble() : null,
+      ul: json['ul'] != null ? (json['ul'] as num).toDouble() : null,
+      description: json['description'],
+    );
+  }
+}
+
+class UpperLimit {
+  final double value;
+  final String unit;
+  final String? duration;
+  final String? note;
+
+  const UpperLimit({
+    required this.value,
+    required this.unit,
+    this.duration,
+    this.note,
+  });
+
+  factory UpperLimit.fromJson(Map<String, dynamic> json) {
+    return UpperLimit(
+      value: (json['value'] as num).toDouble(),
+      unit: json['unit'] ?? '',
+      duration: json['duration'],
+      note: json['note'],
+    );
+  }
+}

lib/models/supplement.dart

@@ -2,8 +2,8 @@ import 'dart:convert';
 
 import 'package:uuid/uuid.dart';
 
-import 'ingredient.dart';
 import '../services/database_sync_service.dart';
+import 'ingredient.dart';
 
 class Supplement {
   final int? id;
@@ -69,8 +69,7 @@ class Supplement {
   }
 
   Map<String, dynamic> toMap() {
-    return {
-      'id': id,
+    final map = <String, dynamic>{
       'name': name,
       'brand': brand,
       'ingredients': jsonEncode(ingredients.map((ingredient) => ingredient.toMap()).toList()),
@@ -86,6 +85,12 @@ class Supplement {
       'syncStatus': syncStatus.name,
       'isDeleted': isDeleted ? 1 : 0,
     };
+
+    if (id != null) {
+      map['id'] = id;
+    }
+
+    return map;
   }
 
   factory Supplement.fromMap(Map<String, dynamic> map) {
@@ -133,6 +138,7 @@ class Supplement {
 
   Supplement copyWith({
     int? id,
+    bool setNullId = false,
     String? name,
     String? brand,
     List<Ingredient>? ingredients,
@@ -144,12 +150,13 @@ class Supplement {
     DateTime? createdAt,
     bool? isActive,
     String? syncId,
+    bool newSyncId = false,
     DateTime? lastModified,
     RecordSyncStatus? syncStatus,
     bool? isDeleted,
   }) {
     return Supplement(
-      id: id ?? this.id,
+      id: setNullId ? null : (id ?? this.id),
       name: name ?? this.name,
       brand: brand ?? this.brand,
       ingredients: ingredients ?? this.ingredients,
@@ -160,7 +167,7 @@ class Supplement {
       notes: notes ?? this.notes,
       createdAt: createdAt ?? this.createdAt,
       isActive: isActive ?? this.isActive,
-      syncId: syncId ?? this.syncId,
+      syncId: newSyncId ? null : (syncId ?? this.syncId),
       lastModified: lastModified ?? this.lastModified,
       syncStatus: syncStatus ?? this.syncStatus,
       isDeleted: isDeleted ?? this.isDeleted,

lib/providers/settings_provider.dart

@@ -10,6 +10,10 @@ enum ThemeOption {
 class SettingsProvider extends ChangeNotifier {
   ThemeOption _themeOption = ThemeOption.system;
 
+  // Profile fields
+  DateTime? _dateOfBirth;
+  String? _gender;
+
   // Time range settings (stored as hours, 0-23)
   int _morningStart = 5;
   int _morningEnd = 10;
@@ -25,8 +29,25 @@ class SettingsProvider extends ChangeNotifier {
   int _reminderRetryInterval = 5; // minutes
   int _maxRetryAttempts = 3;
 
+  // Auto-sync settings
+  bool _autoSyncEnabled = false;
+  int _autoSyncDebounceSeconds = 5;
+
   ThemeOption get themeOption => _themeOption;
 
+  // Profile getters
+  DateTime? get dateOfBirth => _dateOfBirth;
+  String? get gender => _gender;
+  int? get age {
+    if (_dateOfBirth == null) return null;
+    final now = DateTime.now();
+    int years = now.year - _dateOfBirth!.year;
+    final hasHadBirthday = (now.month > _dateOfBirth!.month) ||
+        (now.month == _dateOfBirth!.month && now.day >= _dateOfBirth!.day);
+    if (!hasHadBirthday) years--;
+    return years;
+  }
+
   // Time range getters
   int get morningStart => _morningStart;
   int get morningEnd => _morningEnd;
@@ -42,6 +63,10 @@ class SettingsProvider extends ChangeNotifier {
   int get reminderRetryInterval => _reminderRetryInterval;
   int get maxRetryAttempts => _maxRetryAttempts;
 
+  // Auto-sync getters
+  bool get autoSyncEnabled => _autoSyncEnabled;
+  int get autoSyncDebounceSeconds => _autoSyncDebounceSeconds;
+
   // Helper method to get formatted time ranges for display
   String get morningRange => '${_formatHour(_morningStart)} - ${_formatHour((_morningEnd + 1) % 24)}';
   String get afternoonRange => '${_formatHour(_afternoonStart)} - ${_formatHour((_afternoonEnd + 1) % 24)}';
@@ -68,6 +93,13 @@ class SettingsProvider extends ChangeNotifier {
     final themeIndex = prefs.getInt('theme_option') ?? 0;
     _themeOption = ThemeOption.values[themeIndex];
 
+    // Load profile fields
+    final dobString = prefs.getString('date_of_birth');
+    if (dobString != null) {
+      _dateOfBirth = DateTime.tryParse(dobString);
+    }
+    _gender = prefs.getString('gender');
+
     // Load time range settings
     _morningStart = prefs.getInt('morning_start') ?? 5;
     _morningEnd = prefs.getInt('morning_end') ?? 10;
@@ -83,6 +115,10 @@ class SettingsProvider extends ChangeNotifier {
     _reminderRetryInterval = prefs.getInt('reminder_retry_interval') ?? 5;
     _maxRetryAttempts = prefs.getInt('max_retry_attempts') ?? 3;
 
+    // Load auto-sync settings
+    _autoSyncEnabled = prefs.getBool('auto_sync_enabled') ?? false;
+    _autoSyncDebounceSeconds = prefs.getInt('auto_sync_debounce_seconds') ?? 30;
+
     notifyListeners();
   }
 
@@ -94,6 +130,16 @@ class SettingsProvider extends ChangeNotifier {
     await prefs.setInt('theme_option', option.index);
   }
 
+  Future<void> setDateOfBirthAndGender(DateTime dateOfBirth, String gender) async {
+    _dateOfBirth = dateOfBirth;
+    _gender = gender;
+    notifyListeners();
+
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setString('date_of_birth', dateOfBirth.toIso8601String());
+    await prefs.setString('gender', gender);
+  }
+
   Future<void> setTimeRanges({
     required int morningStart,
     required int morningEnd,
@@ -256,4 +302,21 @@ class SettingsProvider extends ChangeNotifier {
     final prefs = await SharedPreferences.getInstance();
     await prefs.setInt('max_retry_attempts', attempts);
   }
+
+  // Auto-sync setters
+  Future<void> setAutoSyncEnabled(bool enabled) async {
+    _autoSyncEnabled = enabled;
+    notifyListeners();
+
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setBool('auto_sync_enabled', enabled);
+  }
+
+  Future<void> setAutoSyncDebounceSeconds(int seconds) async {
+    _autoSyncDebounceSeconds = seconds;
+    notifyListeners();
+
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setInt('auto_sync_debounce_seconds', seconds);
+  }
 }

lib/providers/simple_sync_provider.dart

@@ -1,7 +1,8 @@
 import 'package:flutter/foundation.dart';
-import 'package:flutter/material.dart';
 
 import '../services/database_sync_service.dart';
+import '../services/auto_sync_service.dart';
+import 'settings_provider.dart';
 
 class SimpleSyncProvider with ChangeNotifier {
   final DatabaseSyncService _syncService = DatabaseSyncService();
@@ -9,6 +10,12 @@ class SimpleSyncProvider with ChangeNotifier {
   // Callback for UI refresh after sync
   VoidCallback? _onSyncCompleteCallback;
   
+  // Auto-sync service
+  AutoSyncService? _autoSyncService;
+  
+  // Track if current sync is auto-triggered
+  bool _isAutoSync = false;
+  
   // Getters
   SyncStatus get status => _syncService.status;
   String? get lastError => _syncService.lastError;
@@ -17,6 +24,14 @@ class SimpleSyncProvider with ChangeNotifier {
   bool get isSyncing => status == SyncStatus.downloading || 
                         status == SyncStatus.merging || 
                         status == SyncStatus.uploading;
+  bool get isAutoSync => _isAutoSync;
+  AutoSyncService? get autoSyncService => _autoSyncService;
+  
+  // Auto-sync error handling getters
+  bool get isAutoSyncDisabledDueToErrors => _autoSyncService?.isAutoDisabledDueToErrors ?? false;
+  int get autoSyncConsecutiveFailures => _autoSyncService?.consecutiveFailures ?? 0;
+  String? get autoSyncLastError => _autoSyncService?.lastErrorMessage;
+  bool get hasAutoSyncScheduledRetry => _autoSyncService?.hasScheduledRetry ?? false;
   
   // Configuration getters
   String? get serverUrl => _syncService.serverUrl;
@@ -43,6 +58,23 @@ class SimpleSyncProvider with ChangeNotifier {
     _onSyncCompleteCallback = callback;
   }
 
+  /// Initialize auto-sync service with settings provider
+  void initializeAutoSync(SettingsProvider settingsProvider) {
+    _autoSyncService = AutoSyncService(
+      syncProvider: this,
+      settingsProvider: settingsProvider,
+    );
+    
+    if (kDebugMode) {
+      print('SimpleSyncProvider: Auto-sync service initialized');
+    }
+  }
+
+  /// Triggers auto-sync if enabled and configured
+  void triggerAutoSyncIfEnabled() {
+    _autoSyncService?.triggerAutoSync();
+  }
+
   Future<void> _loadConfiguration() async {
     await _syncService.loadSavedConfiguration();
     notifyListeners(); // Notify UI that configuration might be available
@@ -67,11 +99,14 @@ class SimpleSyncProvider with ChangeNotifier {
     return await _syncService.testConnection();
   }
 
-  Future<void> syncDatabase() async {
+  Future<void> syncDatabase({bool isAutoSync = false}) async {
     if (!isConfigured) {
       throw Exception('Sync not configured');
     }
     
+    _isAutoSync = isAutoSync;
+    notifyListeners();
+    
     try {
       await _syncService.syncDatabase();
     } catch (e) {
@@ -79,6 +114,9 @@ class SimpleSyncProvider with ChangeNotifier {
         print('SupplementsLog: Sync failed in provider: $e');
       }
       rethrow;
+    } finally {
+      _isAutoSync = false;
+      notifyListeners();
     }
   }
 
@@ -87,20 +125,46 @@ class SimpleSyncProvider with ChangeNotifier {
     notifyListeners();
   }
 
+  /// Resets auto-sync error state and re-enables auto-sync if it was disabled
+  void resetAutoSyncErrors() {
+    _autoSyncService?.resetErrorState();
+    notifyListeners();
+  }
+
   String getStatusText() {
+    final syncType = _isAutoSync ? 'Auto-sync' : 'Sync';
+    
+    // Check for auto-sync specific errors first
+    if (isAutoSyncDisabledDueToErrors) {
+      return 'Auto-sync disabled due to repeated failures. ${autoSyncLastError ?? 'Check sync settings.'}';
+    }
+    
     switch (status) {
       case SyncStatus.idle:
+        if (hasAutoSyncScheduledRetry) {
+          return 'Auto-sync will retry shortly...';
+        }
         return 'Ready to sync';
       case SyncStatus.downloading:
-        return 'Downloading remote database...';
+        return '$syncType: Downloading remote database...';
       case SyncStatus.merging:
-        return 'Merging databases...';
+        return '$syncType: Merging databases...';
       case SyncStatus.uploading:
-        return 'Uploading database...';
+        return '$syncType: Uploading database...';
       case SyncStatus.completed:
-        return 'Sync completed successfully';
+        return '$syncType completed successfully';
       case SyncStatus.error:
-        return 'Sync failed: ${lastError ?? 'Unknown error'}';
+        // For auto-sync errors, show more specific messages
+        if (_isAutoSync && autoSyncLastError != null) {
+          return 'Auto-sync failed: $autoSyncLastError';
+        }
+        return '$syncType failed: ${lastError ?? 'Unknown error'}';
     }
   }
+
+  @override
+  void dispose() {
+    _autoSyncService?.dispose();
+    super.dispose();
+  }
 }

lib/providers/supplement_provider.dart

@@ -7,6 +7,7 @@ import 'package:flutter_local_notifications/flutter_local_notifications.dart';
 import '../models/supplement.dart';
 import '../models/supplement_intake.dart';
 import '../services/database_helper.dart';
+import '../services/database_sync_service.dart';
 import '../services/notification_service.dart';
 
 class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
@@ -280,6 +281,28 @@ class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
     }
   }
 
+  Future<void> duplicateSupplement(int supplementId) async {
+    try {
+      final originalSupplement = await _databaseHelper.getSupplement(supplementId);
+      if (originalSupplement != null) {
+        final newSupplement = originalSupplement.copyWith(
+          setNullId: true, // This will be a new entry
+          newSyncId: true, // Generate a new syncId
+          name: '${originalSupplement.name} (Copy)',
+          createdAt: DateTime.now(),
+          lastModified: DateTime.now(),
+          syncStatus: RecordSyncStatus.pending,
+          isDeleted: false,
+        );
+        await addSupplement(newSupplement);
+      }
+    } catch (e) {
+      if (kDebugMode) {
+        print('SupplementsLog: Error duplicating supplement: $e');
+      }
+    }
+  }
+
   Future<void> deleteSupplement(int id) async {
     try {
       await _databaseHelper.deleteSupplement(id);
@@ -420,6 +443,22 @@ class SupplementProvider with ChangeNotifier, WidgetsBindingObserver {
     return _todayIntakes.where((intake) => intake['supplement_id'] == supplementId).length;
   }
 
+  Map<String, double> get dailyIngredientIntake {
+    final Map<String, double> ingredientIntake = {};
+
+    for (final intake in _todayIntakes) {
+      final supplement = _supplements.firstWhere((s) => s.id == intake['supplement_id']);
+      final unitsTaken = intake['unitsTaken'] as double;
+
+      for (final ingredient in supplement.ingredients) {
+        final currentAmount = ingredientIntake[ingredient.name] ?? 0;
+        ingredientIntake[ingredient.name] = currentAmount + (ingredient.amount * unitsTaken);
+      }
+    }
+
+    return ingredientIntake;
+  }
+
   // Method to manually refresh daily status (useful for testing or manual refresh)
   Future<void> refreshDailyStatus() async {
     if (kDebugMode) {

lib/screens/add_supplement_screen.dart

@@ -3,8 +3,10 @@ import 'package:provider/provider.dart';
 import 'package:uuid/uuid.dart';
 
 import '../models/ingredient.dart';
+import '../models/nutrient.dart';
 import '../models/supplement.dart';
 import '../providers/supplement_provider.dart';
+import '../services/nutrient_data_service.dart';
 
 // Helper class to manage ingredient text controllers
 class IngredientController {
@@ -51,6 +53,10 @@ class _AddSupplementScreenState extends State<AddSupplementScreen> {
   final _numberOfUnitsController = TextEditingController();
   final _notesController = TextEditingController();
 
+  // Nutrient data for autocomplete
+  final NutrientDataService _nutrientDataService = NutrientDataService();
+  List<Nutrient> _nutrients = [];
+
   // Multi-ingredient support with persistent controllers
   List<IngredientController> _ingredientControllers = [];
 
@@ -224,6 +230,13 @@ class _AddSupplementScreenState extends State<AddSupplementScreen> {
       appBar: AppBar(
         title: Text(isEditing ? 'Edit Supplement' : 'Add Supplement'),
         backgroundColor: Theme.of(context).colorScheme.inversePrimary,
+        actions: [
+          IconButton(
+            tooltip: isEditing ? 'Update Supplement' : 'Save Supplement',
+            onPressed: _saveSupplement,
+            icon: const Icon(Icons.save),
+          ),
+        ],
       ),
       body: Form(
         key: _formKey,
@@ -482,17 +495,7 @@ class _AddSupplementScreenState extends State<AddSupplementScreen> {
               ),
               const SizedBox(height: 24),
 
-              // Save button
-              SizedBox(
-                width: double.infinity,
-                child: ElevatedButton(
-                  onPressed: _saveSupplement,
-                  style: ElevatedButton.styleFrom(
-                    padding: const EdgeInsets.all(16),
-                  ),
-                  child: Text(isEditing ? 'Update Supplement' : 'Add Supplement'),
-                ),
-              ),
+              // Save is now in the AppBar for consistency with app-wide pattern
             ],
           ),
         ),
@@ -560,21 +563,24 @@ class _AddSupplementScreenState extends State<AddSupplementScreen> {
   void _saveSupplement() async {
     if (_formKey.currentState!.validate()) {
       // Validate that we have at least one ingredient with name and amount
-      final validIngredients = _ingredientControllers.where((controller) =>
+      final validIngredients = _ingredientControllers
+          .where((controller) =>
               controller.nameController.text.trim().isNotEmpty &&
-        (double.tryParse(controller.amountController.text) ?? 0) > 0
-      ).map((controller) => Ingredient(
+              (double.tryParse(controller.amountController.text) ?? 0) > 0)
+          .map((controller) => Ingredient(
                 name: controller.nameController.text.trim(),
                 amount: double.tryParse(controller.amountController.text) ?? 0.0,
                 unit: controller.selectedUnit,
                 syncId: const Uuid().v4(),
                 lastModified: DateTime.now(),
-      )).toList();
+              ))
+          .toList();
 
       if (validIngredients.isEmpty) {
         ScaffoldMessenger.of(context).showSnackBar(
           const SnackBar(
-            content: Text('Please add at least one ingredient with name and amount'),
+            content:
+                Text('Please add at least one ingredient with name and amount'),
           ),
         );
         return;
@@ -583,14 +589,20 @@ class _AddSupplementScreenState extends State<AddSupplementScreen> {
       final supplement = Supplement(
         id: widget.supplement?.id,
         name: _nameController.text.trim(),
-        brand: _brandController.text.trim().isNotEmpty ? _brandController.text.trim() : null,
+        brand: _brandController.text.trim().isNotEmpty
+            ? _brandController.text.trim()
+            : null,
         ingredients: validIngredients,
         numberOfUnits: int.parse(_numberOfUnitsController.text),
         unitType: _selectedUnitType,
         frequencyPerDay: _frequencyPerDay,
         reminderTimes: _reminderTimes,
-        notes: _notesController.text.trim().isNotEmpty ? _notesController.text.trim() : null,
+        notes: _notesController.text.trim().isNotEmpty
+            ? _notesController.text.trim()
+            : null,
         createdAt: widget.supplement?.createdAt ?? DateTime.now(),
+        syncId: widget.supplement?.syncId, // Preserve syncId on update
+        lastModified: DateTime.now(), // Always update lastModified on save
       );
 
       final provider = context.read<SupplementProvider>();

lib/screens/archived_supplements_screen.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
+import 'package:supplements/widgets/info_chip.dart';
 
 import '../models/supplement.dart';
 import '../providers/supplement_provider.dart';
@@ -306,13 +307,13 @@ class _ArchivedSupplementCard extends StatelessWidget {
               // Dosage info
               Row(
                 children: [
-                  _InfoChip(
+                  InfoChip(
                     icon: Icons.schedule,
                     label: '${supplement.frequencyPerDay}x daily',
                     context: context,
                   ),
                   const SizedBox(width: 8),
-                  _InfoChip(
+                  InfoChip(
                     icon: Icons.medication,
                     label: '${supplement.numberOfUnits} ${supplement.unitType}',
                     context: context,
@@ -322,7 +323,7 @@ class _ArchivedSupplementCard extends StatelessWidget {
 
               if (supplement.reminderTimes.isNotEmpty) ...[
                 const SizedBox(height: 8),
-                _InfoChip(
+                InfoChip(
                   icon: Icons.notifications_off,
                   label: 'Was: ${supplement.reminderTimes.join(', ')}',
                   context: context,
@@ -336,51 +337,3 @@ class _ArchivedSupplementCard extends StatelessWidget {
     );
   }
 }
-
-class _InfoChip extends StatelessWidget {
-  final IconData icon;
-  final String label;
-  final BuildContext context;
-  final bool fullWidth;
-
-  const _InfoChip({
-    required this.icon,
-    required this.label,
-    required this.context,
-    this.fullWidth = false,
-  });
-
-  @override
-  Widget build(BuildContext context) {
-    return Container(
-      width: fullWidth ? double.infinity : null,
-      padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 6),
-      decoration: BoxDecoration(
-        color: Theme.of(context).colorScheme.surfaceVariant.withOpacity(0.4),
-        borderRadius: BorderRadius.circular(8),
-      ),
-      child: Row(
-        mainAxisSize: fullWidth ? MainAxisSize.max : MainAxisSize.min,
-        children: [
-          Icon(
-            icon,
-            size: 14,
-            color: Theme.of(context).colorScheme.outline,
-          ),
-          const SizedBox(width: 4),
-          Flexible(
-            child: Text(
-              label,
-              style: TextStyle(
-                fontSize: 11,
-                color: Theme.of(context).colorScheme.outline,
-                fontWeight: FontWeight.w500,
-              ),
-              overflow: TextOverflow.ellipsis,
-            ),
-          ),
-        ],
-      ),
-    );
-  }
-}

lib/screens/history_screen.dart

@@ -2,6 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:intl/intl.dart';
 import 'package:provider/provider.dart';
 
+import '../providers/settings_provider.dart';
 import '../providers/supplement_provider.dart';
 
 class HistoryScreen extends StatefulWidget {
@@ -125,15 +126,19 @@ class _HistoryScreenState extends State<HistoryScreen> {
                         Expanded(
                           flex: 3,
                           child: Container(
-                            margin: const EdgeInsets.fromLTRB(0, 16, 16, 16),
+                            // add a bit more horizontal spacing between calendar and card
+                            margin: const EdgeInsets.fromLTRB(8, 16, 16, 16),
+                            child: SingleChildScrollView(
                               child: _buildSelectedDayDetails(groupedIntakes),
                             ),
                           ),
+                        ),
                       ],
                     );
                   } else {
                     // Mobile layout: vertical stack
-                    return Column(
+                    return SingleChildScrollView(
+                      child: Column(
                         children: [
                           // Calendar
                           Container(
@@ -142,10 +147,12 @@ class _HistoryScreenState extends State<HistoryScreen> {
                           ),
                           const SizedBox(height: 16),
                           // Selected day details
-                        Expanded(
+                          Container(
+                            margin: const EdgeInsets.symmetric(horizontal: 16),
                             child: _buildSelectedDayDetails(groupedIntakes),
                           ),
                         ],
+                      ),
                     );
                   }
                 },
@@ -479,16 +486,140 @@ class _HistoryScreenState extends State<HistoryScreen> {
                   ],
                 ),
               ),
-              Expanded(
-                child: ListView.builder(
+              Padding(
                 padding: EdgeInsets.all(isWideScreen ? 20 : 16),
-                  itemCount: dayIntakes.length,
-                  itemBuilder: (context, index) {
-                    final intake = dayIntakes[index];
+                child: Builder(
+                  builder: (context) {
+                    final settingsProvider = Provider.of<SettingsProvider>(context, listen: false);
+                    // Sort once per render
+                    final sortedDayIntakes = List<Map<String, dynamic>>.from(dayIntakes)
+                      ..sort((a, b) => DateTime.parse(a['takenAt']).compareTo(DateTime.parse(b['takenAt'])));
+                    // Helpers
+                    String timeCategory(DateTime dt) {
+                      final h = dt.hour;
+                      if (h >= settingsProvider.morningStart && h <= settingsProvider.morningEnd) return 'morning';
+                      if (h >= settingsProvider.afternoonStart && h <= settingsProvider.afternoonEnd) return 'afternoon';
+                      if (h >= settingsProvider.eveningStart && h <= settingsProvider.eveningEnd) return 'evening';
+                      final ns = settingsProvider.nightStart;
+                      final ne = settingsProvider.nightEnd;
+                      final inNight = ns <= ne ? (h >= ns && h <= ne) : (h >= ns || h <= ne);
+                      return inNight ? 'night' : 'anytime';
+                    }
+                    String? sectionRange(String cat) {
+                      switch (cat) {
+                        case 'morning':
+                          return settingsProvider.morningRange;
+                        case 'afternoon':
+                          return settingsProvider.afternoonRange;
+                        case 'evening':
+                          return settingsProvider.eveningRange;
+                        case 'night':
+                          return settingsProvider.nightRange;
+                        default:
+                          return null;
+                      }
+                    }
+                    Widget headerFor(String cat) {
+                      late final IconData icon;
+                      late final Color color;
+                      late final String title;
+                      switch (cat) {
+                        case 'morning':
+                          icon = Icons.wb_sunny;
+                          color = Colors.orange;
+                          title = 'Morning';
+                          break;
+                        case 'afternoon':
+                          icon = Icons.light_mode;
+                          color = Colors.blue;
+                          title = 'Afternoon';
+                          break;
+                        case 'evening':
+                          icon = Icons.nightlight_round;
+                          color = Colors.indigo;
+                          title = 'Evening';
+                          break;
+                        case 'night':
+                          icon = Icons.bedtime;
+                          color = Colors.purple;
+                          title = 'Night';
+                          break;
+                        default:
+                          icon = Icons.schedule;
+                          color = Colors.grey;
+                          title = 'Anytime';
+                      }
+                      final range = sectionRange(cat);
+                      return Container(
+                        margin: const EdgeInsets.only(bottom: 12),
+                        padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
+                        decoration: BoxDecoration(
+                          color: color.withOpacity(0.1),
+                          borderRadius: BorderRadius.circular(12),
+                          border: Border.all(
+                            color: color.withOpacity(0.3),
+                            width: 1,
+                          ),
+                        ),
+                        child: Row(
+                          children: [
+                            Container(
+                              padding: const EdgeInsets.all(8),
+                              decoration: BoxDecoration(
+                                color: color.withOpacity(0.2),
+                                shape: BoxShape.circle,
+                              ),
+                              child: Icon(
+                                icon,
+                                size: 20,
+                                color: color,
+                              ),
+                            ),
+                            const SizedBox(width: 12),
+                            Expanded(
+                              child: Column(
+                                crossAxisAlignment: CrossAxisAlignment.start,
+                                children: [
+                                  Text(
+                                    title,
+                                    style: TextStyle(
+                                      fontSize: 18,
+                                      fontWeight: FontWeight.bold,
+                                      color: color,
+                                    ),
+                                  ),
+                                  if (range != null) ...[
+                                    Text(
+                                      '($range)',
+                                      style: TextStyle(
+                                        fontSize: 12,
+                                        fontWeight: FontWeight.w500,
+                                        color: color.withOpacity(0.8),
+                                      ),
+                                    ),
+                                  ],
+                                ],
+                              ),
+                            ),
+                          ],
+                        ),
+                      );
+                    }
+                    // Build a non-scrollable list so the card auto-expands to fit content
+                    final List<Widget> children = [];
+                    for (int index = 0; index < sortedDayIntakes.length; index++) {
+                      final intake = sortedDayIntakes[index];
                       final takenAt = DateTime.parse(intake['takenAt']);
                       final units = (intake['unitsTaken'] as num?)?.toDouble() ?? 1.0;
-
-                    return Card(
+                      final currentCategory = timeCategory(takenAt);
+                      final needsHeader = index == 0
+                          ? true
+                          : currentCategory != timeCategory(DateTime.parse(sortedDayIntakes[index - 1]['takenAt']));
+                      if (needsHeader) {
+                        children.add(headerFor(currentCategory));
+                      }
+                      children.add(
+                        Card(
                           margin: const EdgeInsets.only(bottom: 12),
                           elevation: 2,
                           child: Padding(
@@ -551,6 +682,12 @@ class _HistoryScreenState extends State<HistoryScreen> {
                               ],
                             ),
                           ),
+                        ),
+                      );
+                    }
+                    return Column(
+                      crossAxisAlignment: CrossAxisAlignment.start,
+                      children: children,
                     );
                   },
                 ),

lib/screens/profile_setup_screen.dart

@@ -0,0 +1,129 @@
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+import 'package:supplements/screens/home_screen.dart';
+
+import '../providers/settings_provider.dart';
+
+// Profile setup screen
+class ProfileSetupScreen extends StatefulWidget {
+  const ProfileSetupScreen({super.key});
+
+  @override
+  State<ProfileSetupScreen> createState() => _ProfileSetupScreenState();
+}
+
+class _ProfileSetupScreenState extends State<ProfileSetupScreen> {
+  final _formKey = GlobalKey<FormState>();
+  DateTime? _dateOfBirth;
+  String? _gender;
+
+  final List<String> _genders = ['Male', 'Female', 'Other', 'Prefer not to say'];
+
+  @override
+  void initState() {
+    super.initState();
+    final settingsProvider = Provider.of<SettingsProvider>(context, listen: false);
+    _dateOfBirth = settingsProvider.dateOfBirth;
+    _gender = settingsProvider.gender;
+  }
+
+  void _saveProfile() {
+    if (_formKey.currentState!.validate()) {
+      _formKey.currentState!.save();
+      Provider.of<SettingsProvider>(context, listen: false).setDateOfBirthAndGender(_dateOfBirth!, _gender!);
+      Navigator.of(context).pushReplacement(MaterialPageRoute(builder: (context) => HomeScreen()));
+    }
+  }
+
+  Future<void> _selectDate(BuildContext context) async {
+    final DateTime? picked = await showDatePicker(
+      context: context,
+      initialDate: _dateOfBirth ?? DateTime.now(),
+      firstDate: DateTime(1900),
+      lastDate: DateTime.now(),
+    );
+    if (picked != null && picked != _dateOfBirth) {
+      setState(() {
+        _dateOfBirth = picked;
+      });
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('Set Up Your Profile'),
+      ),
+      body: Padding(
+        padding: const EdgeInsets.all(16.0),
+        child: Form(
+          key: _formKey,
+          child: Column(
+            children: [
+              Text(
+                'To provide you with personalized ingredient insights, please provide your date of birth and gender.',
+                style: Theme.of(context).textTheme.titleMedium,
+                textAlign: TextAlign.center,
+              ),
+              const SizedBox(height: 24),
+              TextFormField(
+                decoration: const InputDecoration(
+                  labelText: 'Date of Birth',
+                  border: OutlineInputBorder(),
+                  suffixIcon: Icon(Icons.calendar_today),
+                ),
+                readOnly: true,
+                controller: TextEditingController(
+                  text: _dateOfBirth == null
+                      ? ''
+                      : '${_dateOfBirth!.toLocal()}'.split(' ')[0],
+                ),
+                onTap: () => _selectDate(context),
+                validator: (value) {
+                  if (_dateOfBirth == null) {
+                    return 'Please select your date of birth';
+                  }
+                  return null;
+                },
+              ),
+              const SizedBox(height: 16),
+              DropdownButtonFormField<String>(
+                decoration: const InputDecoration(
+                  labelText: 'Gender',
+                  border: OutlineInputBorder(),
+                ),
+                value: _gender,
+                items: _genders.map((String gender) {
+                  return DropdownMenuItem<String>(
+                    value: gender,
+                    child: Text(gender),
+                  );
+                }).toList(),
+                onChanged: (value) {
+                  setState(() {
+                    _gender = value;
+                  });
+                },
+                validator: (value) {
+                  if (value == null || value.isEmpty) {
+                    return 'Please select your gender';
+                  }
+                  return null;
+                },
+                onSaved: (value) {
+                  _gender = value;
+                },
+              ),
+              const SizedBox(height: 24),
+              ElevatedButton(
+                onPressed: _saveProfile,
+                child: const Text('Save and Continue'),
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}

lib/screens/settings_screen.dart

@@ -2,9 +2,8 @@ import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 
 import '../providers/settings_provider.dart';
-import '../providers/supplement_provider.dart';
-import '../services/notification_service.dart';
 import 'pending_notifications_screen.dart';
+import 'profile_setup_screen.dart';
 import 'simple_sync_settings_screen.dart';
 
 class SettingsScreen extends StatelessWidget {
@@ -21,6 +20,22 @@ class SettingsScreen extends StatelessWidget {
           return ListView(
             padding: const EdgeInsets.all(16.0),
             children: [
+              Card(
+                child: ListTile(
+                  leading: const Icon(Icons.person),
+                  title: const Text('Profile'),
+                  subtitle: Text('Date of Birth: ${settingsProvider.dateOfBirth != null ? '${settingsProvider.dateOfBirth!.toLocal()}'.split(' ')[0] : 'Not set'}, Gender: ${settingsProvider.gender ?? 'Not set'}'),
+                  trailing: const Icon(Icons.chevron_right),
+                  onTap: () {
+                    Navigator.of(context).push(
+                      MaterialPageRoute(
+                        builder: (context) => const ProfileSetupScreen(),
+                      ),
+                    );
+                  },
+                ),
+              ),
+              const SizedBox(height: 16),
               Card(
                 child: ListTile(
                   leading: const Icon(Icons.cloud_sync),

lib/screens/simple_sync_settings_screen.dart

@@ -1,8 +1,9 @@
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 
-import '../services/database_sync_service.dart';
+import '../providers/settings_provider.dart';
 import '../providers/simple_sync_provider.dart';
+import '../services/database_sync_service.dart';
 
 class SimpleSyncSettingsScreen extends StatefulWidget {
   const SimpleSyncSettingsScreen({super.key});
@@ -81,14 +82,21 @@ class _SimpleSyncSettingsScreenState extends State<SimpleSyncSettingsScreen> {
 
   @override
   Widget build(BuildContext context) {
+    final syncProvider = context.watch<SimpleSyncProvider>();
+
     return Scaffold(
       appBar: AppBar(
         title: const Text('Database Sync Settings'),
         backgroundColor: Theme.of(context).colorScheme.inversePrimary,
+        actions: [
+          IconButton(
+            tooltip: 'Save Configuration',
+            onPressed: syncProvider.isSyncing ? null : _configureSync,
+            icon: const Icon(Icons.save),
           ),
-      body: Consumer<SimpleSyncProvider>(
-        builder: (context, syncProvider, child) {
-          return SingleChildScrollView(
+        ],
+      ),
+      body: SingleChildScrollView(
         padding: const EdgeInsets.all(16.0),
         child: Form(
           key: _formKey,
@@ -97,14 +105,12 @@ class _SimpleSyncSettingsScreenState extends State<SimpleSyncSettingsScreen> {
             children: [
               _buildStatusCard(syncProvider),
               const SizedBox(height: 20),
-                  _buildConfigurationSection(),
+              _buildConfigurationSection(syncProvider),
               const SizedBox(height: 20),
-                  _buildActionButtons(syncProvider),
+              _buildActionButtons(),
             ],
           ),
         ),
-          );
-        },
       ),
     );
   }
@@ -116,17 +122,17 @@ class _SimpleSyncSettingsScreenState extends State<SimpleSyncSettingsScreen> {
 
     switch (syncProvider.status) {
       case SyncStatus.idle:
-        icon = Icons.sync;
+        icon = syncProvider.isAutoSync ? Icons.sync_alt : Icons.sync;
         color = Colors.blue;
         break;
       case SyncStatus.downloading:
       case SyncStatus.merging:
       case SyncStatus.uploading:
-        icon = Icons.sync;
-        color = Colors.orange;
+        icon = syncProvider.isAutoSync ? Icons.sync_alt : Icons.sync;
+        color = syncProvider.isAutoSync ? Colors.deepOrange : Colors.orange;
         break;
       case SyncStatus.completed:
-        icon = Icons.check_circle;
+        icon = syncProvider.isAutoSync ? Icons.check_circle_outline : Icons.check_circle;
         color = Colors.green;
         break;
       case SyncStatus.error:
@@ -152,8 +158,28 @@ class _SimpleSyncSettingsScreenState extends State<SimpleSyncSettingsScreen> {
                     ),
                   ),
                 ),
+                // Sync action inside the status card
+                if (syncProvider.isSyncing) ...[
+                  const SizedBox(width: 12),
+                  SizedBox(
+                    width: 20,
+                    height: 20,
+                    child: CircularProgressIndicator(
+                      strokeWidth: 2.2,
+                      valueColor: AlwaysStoppedAnimation<Color>(color),
+                    ),
+                  ),
+                ] else ...[
+                  IconButton(
+                    tooltip: 'Sync Database',
+                    onPressed: (!syncProvider.isConfigured || syncProvider.isSyncing) ? null : _syncDatabase,
+                    icon: const Icon(Icons.sync),
+                    color: Theme.of(context).colorScheme.primary,
+                  ),
+                ],
               ],
             ),
+            _buildAutoSyncStatusIndicator(syncProvider),
             if (syncProvider.lastSyncTime != null) ...[
               const SizedBox(height: 8),
               Text(
@@ -161,19 +187,73 @@ class _SimpleSyncSettingsScreenState extends State<SimpleSyncSettingsScreen> {
                 style: Theme.of(context).textTheme.bodySmall,
               ),
             ],
-            if (syncProvider.lastError != null) ...[
+            // Show auto-sync specific errors
+            if (syncProvider.isAutoSyncDisabledDueToErrors) ...[
+              const SizedBox(height: 8),
+              Container(
+                padding: const EdgeInsets.all(12),
+                decoration: BoxDecoration(
+                  color: Colors.red.withValues(alpha: 0.1),
+                  borderRadius: BorderRadius.circular(8),
+                  border: Border.all(color: Colors.red.withValues(alpha: 0.3)),
+                ),
+                child: Column(
+                  crossAxisAlignment: CrossAxisAlignment.start,
+                  children: [
+                    Row(
+                      children: [
+                        const Icon(Icons.warning, color: Colors.red, size: 20),
+                        const SizedBox(width: 8),
+                        Expanded(
+                          child: Text(
+                            'Auto-sync disabled due to repeated failures',
+                            style: Theme.of(context).textTheme.titleSmall?.copyWith(
+                              color: Colors.red,
+                              fontWeight: FontWeight.w600,
+                            ),
+                          ),
+                        ),
+                      ],
+                    ),
+                    if (syncProvider.autoSyncLastError != null) ...[
+                      const SizedBox(height: 8),
+                      Text(
+                        syncProvider.autoSyncLastError!,
+                        style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                          color: Colors.red[700],
+                        ),
+                      ),
+                    ],
+                    const SizedBox(height: 12),
+                    Row(
+                      mainAxisAlignment: MainAxisAlignment.end,
+                      children: [
+                        TextButton.icon(
+                          onPressed: () => syncProvider.resetAutoSyncErrors(),
+                          icon: const Icon(Icons.refresh, size: 16),
+                          label: const Text('Reset & Re-enable'),
+                          style: TextButton.styleFrom(
+                            foregroundColor: Colors.red,
+                          ),
+                        ),
+                      ],
+                    ),
+                  ],
+                ),
+              ),
+            ] else if (syncProvider.lastError != null) ...[
               const SizedBox(height: 8),
               Container(
                 padding: const EdgeInsets.all(8),
                 decoration: BoxDecoration(
-                  color: Colors.red.withOpacity(0.1),
+                  color: Colors.red.withValues(alpha: 0.1),
                   borderRadius: BorderRadius.circular(4),
                 ),
                 child: Row(
                   children: [
                     Expanded(
                       child: Text(
-                        syncProvider.lastError!,
+                        _getErrorMessage(syncProvider),
                         style: const TextStyle(color: Colors.red),
                       ),
                     ),
@@ -191,18 +271,38 @@ class _SimpleSyncSettingsScreenState extends State<SimpleSyncSettingsScreen> {
     );
   }
 
-  Widget _buildConfigurationSection() {
-    return Card(
+  Widget _buildConfigurationSection(SimpleSyncProvider syncProvider) {
+    return Column(
+      crossAxisAlignment: CrossAxisAlignment.stretch,
+      children: [
+        Card(
           child: Padding(
-        padding: const EdgeInsets.all(16.0),
+            padding: const EdgeInsets.all(12.0),
             child: Column(
               crossAxisAlignment: CrossAxisAlignment.start,
               children: [
                 Text(
-              'WebDAV Configuration',
+                  'Sync Configuration',
                   style: Theme.of(context).textTheme.titleLarge,
                 ),
-            const SizedBox(height: 16),
+                const SizedBox(height: 8),
+                _buildAutoSyncSection(),
+              ],
+            ),
+          ),
+        ),
+        const SizedBox(height: 12),
+        Card(
+          child: Padding(
+            padding: const EdgeInsets.all(12.0),
+            child: Column(
+              crossAxisAlignment: CrossAxisAlignment.start,
+              children: [
+                Text(
+                  'WebDAV Settings',
+                  style: Theme.of(context).textTheme.titleMedium,
+                ),
+                const SizedBox(height: 8),
                 TextFormField(
                   controller: _serverUrlController,
                   decoration: const InputDecoration(
@@ -218,7 +318,7 @@ class _SimpleSyncSettingsScreenState extends State<SimpleSyncSettingsScreen> {
                     return null;
                   },
                 ),
-            const SizedBox(height: 16),
+                const SizedBox(height: 8),
                 TextFormField(
                   controller: _usernameController,
                   decoration: const InputDecoration(
@@ -233,14 +333,14 @@ class _SimpleSyncSettingsScreenState extends State<SimpleSyncSettingsScreen> {
                   },
                 ),
                 if (_previewUrl.isNotEmpty) ...[
-              const SizedBox(height: 8),
+                  const SizedBox(height: 6),
                   Container(
-                padding: const EdgeInsets.all(12),
+                    padding: const EdgeInsets.all(8),
                     decoration: BoxDecoration(
-                  color: Theme.of(context).colorScheme.surfaceContainerHighest.withOpacity(0.3),
+                      color: Theme.of(context).colorScheme.surfaceContainerHighest.withValues(alpha: 0.3),
                       borderRadius: BorderRadius.circular(8),
                       border: Border.all(
-                    color: Theme.of(context).colorScheme.outline.withOpacity(0.5),
+                        color: Theme.of(context).colorScheme.outline.withValues(alpha: 0.5),
                       ),
                     ),
                     child: Column(
@@ -258,11 +358,26 @@ class _SimpleSyncSettingsScreenState extends State<SimpleSyncSettingsScreen> {
                             color: Theme.of(context).colorScheme.primary,
                           ),
                         ),
+                        const SizedBox(height: 6),
+                        Row(
+                          mainAxisAlignment: MainAxisAlignment.end,
+                          children: [
+                            ElevatedButton.icon(
+                              onPressed: syncProvider.isSyncing ? null : _testConnection,
+                              icon: const Icon(Icons.link),
+                              label: const Text('Test'),
+                              style: ElevatedButton.styleFrom(
+                                shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(8)),
+                                elevation: 0,
+                              ),
+                            ),
+                          ],
+                        ),
                       ],
                     ),
                   ),
                 ],
-            const SizedBox(height: 16),
+                const SizedBox(height: 8),
                 TextFormField(
                   controller: _passwordController,
                   decoration: const InputDecoration(
@@ -277,7 +392,7 @@ class _SimpleSyncSettingsScreenState extends State<SimpleSyncSettingsScreen> {
                     return null;
                   },
                 ),
-            const SizedBox(height: 16),
+                const SizedBox(height: 8),
                 TextFormField(
                   controller: _remotePathController,
                   decoration: const InputDecoration(
@@ -289,43 +404,127 @@ class _SimpleSyncSettingsScreenState extends State<SimpleSyncSettingsScreen> {
               ],
             ),
           ),
+        ),
+      ],
     );
   }
 
-  Widget _buildActionButtons(SimpleSyncProvider syncProvider) {
-    return Column(
-      crossAxisAlignment: CrossAxisAlignment.stretch,
+  Widget _buildActionButtons() {
+    // Buttons have been moved into the AppBar / cards. Keep a small spacer here for layout.
+    return const SizedBox.shrink();
+  }
+
+  Widget _buildAutoSyncSection() {
+    return Consumer<SettingsProvider>(
+      builder: (context, settingsProvider, child) {
+        return Consumer<SimpleSyncProvider>(
+          builder: (context, syncProvider, child) {
+        return Container(
+          padding: const EdgeInsets.all(16.0),
+          decoration: BoxDecoration(
+            color: Theme.of(context).colorScheme.surfaceContainerHighest.withValues(alpha: 0.3),
+            borderRadius: BorderRadius.circular(12),
+            border: Border.all(
+              color: Theme.of(context).colorScheme.outline.withValues(alpha: 0.5),
+            ),
+          ),
+          child: Column(
+            crossAxisAlignment: CrossAxisAlignment.start,
             children: [
-        ElevatedButton(
-          onPressed: syncProvider.isSyncing ? null : _testConnection,
-          child: const Text('Test Connection'),
+              SwitchListTile(
+                title: Row(
+                  children: [
+                    const Text(
+                      'Auto-sync',
+                      style: TextStyle(fontWeight: FontWeight.w600),
+                    ),
+                    const SizedBox(width: 8),
+                    _buildAutoSyncStatusBadge(settingsProvider, syncProvider),
+                  ],
+                ),
+                subtitle: Text(
+                  settingsProvider.autoSyncEnabled
+                      ? 'Automatically sync when you make changes'
+                      : 'Sync manually using the sync button',
+                  style: Theme.of(context).textTheme.bodySmall,
+                ),
+                value: settingsProvider.autoSyncEnabled,
+                onChanged: (bool value) async {
+                  await settingsProvider.setAutoSyncEnabled(value);
+                },
+                contentPadding: EdgeInsets.zero,
+              ),
+              if (settingsProvider.autoSyncEnabled) ...[
+                const SizedBox(height: 8),
+                Padding(
+                  padding: const EdgeInsets.only(left: 16.0),
+                  child: Text(
+                    'Changes are debounced for ${settingsProvider.autoSyncDebounceSeconds} seconds to prevent excessive syncing.',
+                    style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                      color: Theme.of(context).colorScheme.onSurfaceVariant,
+                      fontStyle: FontStyle.italic,
+                    ),
+                  ),
                 ),
                 const SizedBox(height: 12),
-        ElevatedButton(
-          onPressed: syncProvider.isSyncing ? null : _configureSync,
-          child: const Text('Save Configuration'),
+                Padding(
+                  padding: const EdgeInsets.only(left: 16.0),
+                  child: Column(
+                    crossAxisAlignment: CrossAxisAlignment.start,
+                    children: [
+                      Text(
+                        'Debounce timeout',
+                        style: Theme.of(context).textTheme.titleSmall,
                       ),
-        const SizedBox(height: 12),
-        ElevatedButton(
-          onPressed: (!syncProvider.isConfigured || syncProvider.isSyncing) 
-              ? null 
-              : _syncDatabase,
-          style: ElevatedButton.styleFrom(
-            backgroundColor: Theme.of(context).primaryColor,
-            foregroundColor: Colors.white,
-          ),
-          child: syncProvider.isSyncing 
-              ? const SizedBox(
-                  width: 20,
-                  height: 20,
-                  child: CircularProgressIndicator(
-                    strokeWidth: 2,
-                    valueColor: AlwaysStoppedAnimation<Color>(Colors.white),
-                  ),
-                )
-              : const Text('Sync Database'),
+                      const SizedBox(height: 8),
+                      SegmentedButton<int>(
+                        segments: const [
+                          ButtonSegment(value: 1, label: Text('1s')),
+                          ButtonSegment(value: 5, label: Text('5s')),
+                          ButtonSegment(value: 15, label: Text('15s')),
+                          ButtonSegment(value: 30, label: Text('30s')),
+                        ],
+                        selected: {settingsProvider.autoSyncDebounceSeconds},
+                        onSelectionChanged: (values) {
+                          settingsProvider.setAutoSyncDebounceSeconds(values.first);
+                        },
                       ),
                     ],
+                  ),
+                ),
+              ],
+              const SizedBox(height: 12),
+              Container(
+                padding: const EdgeInsets.all(12),
+                decoration: BoxDecoration(
+                  color: Theme.of(context).colorScheme.primaryContainer.withValues(alpha: 0.3),
+                  borderRadius: BorderRadius.circular(8),
+                ),
+                child: Row(
+                  children: [
+                    Icon(
+                      Icons.info_outline,
+                      size: 16,
+                      color: Theme.of(context).colorScheme.primary,
+                    ),
+                    const SizedBox(width: 8),
+                    Expanded(
+                      child: Text(
+                        'Auto-sync triggers when you add, update, or delete supplements and intakes. Configure your WebDAV settings below to enable syncing.',
+                        style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                          color: Theme.of(context).colorScheme.onPrimaryContainer,
+                        ),
+                      ),
+                    ),
+                  ],
+                ),
+              ),
+            ],
+          ),
+        );
+          },
+        );
+      },
     );
   }
 
@@ -420,12 +619,12 @@ class _SimpleSyncSettingsScreenState extends State<SimpleSyncSettingsScreen> {
     final syncProvider = context.read<SimpleSyncProvider>();
 
     try {
-      await syncProvider.syncDatabase();
+      await syncProvider.syncDatabase(isAutoSync: false);
 
       if (mounted) {
         ScaffoldMessenger.of(context).showSnackBar(
           const SnackBar(
-            content: Text('Database sync completed!'),
+            content: Text('Manual sync completed!'),
             backgroundColor: Colors.green,
           ),
         );
@@ -434,7 +633,7 @@ class _SimpleSyncSettingsScreenState extends State<SimpleSyncSettingsScreen> {
       if (mounted) {
         ScaffoldMessenger.of(context).showSnackBar(
           SnackBar(
-            content: Text('Sync failed: $e'),
+            content: Text('Manual sync failed: $e'),
             backgroundColor: Colors.red,
           ),
         );
@@ -461,6 +660,189 @@ class _SimpleSyncSettingsScreenState extends State<SimpleSyncSettingsScreen> {
     return 'https://$cleanUrl/remote.php/dav/files/$username/';
   }
 
+  Widget _buildAutoSyncStatusIndicator(SimpleSyncProvider syncProvider) {
+    return Consumer<SettingsProvider>(
+      builder: (context, settingsProvider, child) {
+        // Only show auto-sync status if auto-sync is enabled
+        if (!settingsProvider.autoSyncEnabled) {
+          return const SizedBox.shrink();
+        }
+
+        // Check if auto-sync service has pending sync
+        final autoSyncService = syncProvider.autoSyncService;
+        if (autoSyncService == null) {
+          return const SizedBox.shrink();
+        }
+
+        // Show pending auto-sync indicator
+        if (autoSyncService.hasPendingSync && !syncProvider.isSyncing) {
+          return Container(
+            margin: const EdgeInsets.only(top: 8),
+            padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
+            decoration: BoxDecoration(
+              color: Colors.blue.withValues(alpha: 0.1),
+              borderRadius: BorderRadius.circular(16),
+              border: Border.all(color: Colors.blue.withValues(alpha: 0.3)),
+            ),
+            child: Row(
+              mainAxisSize: MainAxisSize.min,
+              children: [
+                SizedBox(
+                  width: 12,
+                  height: 12,
+                  child: CircularProgressIndicator(
+                    strokeWidth: 1.5,
+                    valueColor: const AlwaysStoppedAnimation<Color>(Colors.blue),
+                  ),
+                ),
+                const SizedBox(width: 8),
+                Text(
+                  'Auto-sync pending...',
+                  style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                    color: Colors.blue,
+                    fontWeight: FontWeight.w500,
+                  ),
+                ),
+              ],
+            ),
+          );
+        }
+
+        // Show auto-sync active indicator (when sync is running and it's auto-triggered)
+        if (syncProvider.isSyncing && syncProvider.isAutoSync) {
+          return Container(
+            margin: const EdgeInsets.only(top: 8),
+            padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
+            decoration: BoxDecoration(
+              color: Colors.deepOrange.withValues(alpha: 0.1),
+              borderRadius: BorderRadius.circular(16),
+              border: Border.all(color: Colors.deepOrange.withValues(alpha: 0.3)),
+            ),
+            child: Row(
+              mainAxisSize: MainAxisSize.min,
+              children: [
+                Icon(
+                  Icons.sync_alt,
+                  size: 12,
+                  color: Colors.deepOrange,
+                ),
+                const SizedBox(width: 8),
+                Text(
+                  'Auto-sync active',
+                  style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                    color: Colors.deepOrange,
+                    fontWeight: FontWeight.w500,
+                  ),
+                ),
+              ],
+            ),
+          );
+        }
+
+        return const SizedBox.shrink();
+      },
+    );
+  }
+
+  Widget _buildAutoSyncStatusBadge(SettingsProvider settingsProvider, SimpleSyncProvider syncProvider) {
+    if (!settingsProvider.autoSyncEnabled) {
+      return Container(
+        padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 2),
+        decoration: BoxDecoration(
+          color: Colors.grey.withValues(alpha: 0.2),
+          borderRadius: BorderRadius.circular(8),
+        ),
+        child: Text(
+          'OFF',
+          style: Theme.of(context).textTheme.labelSmall?.copyWith(
+            color: Colors.grey[600],
+            fontWeight: FontWeight.w600,
+          ),
+        ),
+      );
+    }
+
+    // Check if auto-sync is disabled due to errors
+    if (syncProvider.isAutoSyncDisabledDueToErrors) {
+      return Container(
+        padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 2),
+        decoration: BoxDecoration(
+          color: Colors.red.withValues(alpha: 0.2),
+          borderRadius: BorderRadius.circular(8),
+        ),
+        child: Text(
+          'ERROR',
+          style: Theme.of(context).textTheme.labelSmall?.copyWith(
+            color: Colors.red[700],
+            fontWeight: FontWeight.w600,
+          ),
+        ),
+      );
+    }
+
+    // Check if sync is configured
+    if (!syncProvider.isConfigured) {
+      return Container(
+        padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 2),
+        decoration: BoxDecoration(
+          color: Colors.orange.withValues(alpha: 0.2),
+          borderRadius: BorderRadius.circular(8),
+        ),
+        child: Text(
+          'NOT CONFIGURED',
+          style: Theme.of(context).textTheme.labelSmall?.copyWith(
+            color: Colors.orange[700],
+            fontWeight: FontWeight.w600,
+          ),
+        ),
+      );
+    }
+
+    // Check if there are recent failures but not disabled yet
+    if (syncProvider.autoSyncConsecutiveFailures > 0) {
+      return Container(
+        padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 2),
+        decoration: BoxDecoration(
+          color: Colors.orange.withValues(alpha: 0.2),
+          borderRadius: BorderRadius.circular(8),
+        ),
+        child: Text(
+          'RETRYING',
+          style: Theme.of(context).textTheme.labelSmall?.copyWith(
+            color: Colors.orange[700],
+            fontWeight: FontWeight.w600,
+          ),
+        ),
+      );
+    }
+
+    return Container(
+      padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 2),
+      decoration: BoxDecoration(
+        color: Colors.green.withValues(alpha: 0.2),
+        borderRadius: BorderRadius.circular(8),
+      ),
+      child: Text(
+        'ACTIVE',
+        style: Theme.of(context).textTheme.labelSmall?.copyWith(
+          color: Colors.green[700],
+          fontWeight: FontWeight.w600,
+        ),
+      ),
+    );
+  }
+
+  String _getErrorMessage(SimpleSyncProvider syncProvider) {
+    final error = syncProvider.lastError ?? 'Unknown error';
+
+    // Add context for auto-sync errors
+    if (syncProvider.isAutoSync) {
+      return 'Auto-sync error: $error';
+    }
+
+    return error;
+  }
+
   String _formatDateTime(DateTime dateTime) {
     return '${dateTime.day}/${dateTime.month}/${dateTime.year} ${dateTime.hour}:${dateTime.minute.toString().padLeft(2, '0')}';
   }

lib/screens/supplements_list_screen.dart

@@ -1,11 +1,15 @@
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
+import 'package:supplements/widgets/info_chip.dart';
+import 'package:url_launcher/url_launcher.dart';
 
+import '../models/ingredient.dart';
 import '../models/supplement.dart';
 import '../providers/settings_provider.dart';
-import '../providers/supplement_provider.dart';
 import '../providers/simple_sync_provider.dart';
+import '../providers/supplement_provider.dart';
 import '../services/database_sync_service.dart';
+import '../services/rda_service.dart';
 import '../widgets/supplement_card.dart';
 import 'add_supplement_screen.dart';
 import 'archived_supplements_screen.dart';
@@ -107,11 +111,162 @@ class SupplementsListScreen extends StatelessWidget {
   }
 
   Widget _buildGroupedSupplementsList(BuildContext context, List<Supplement> supplements, SettingsProvider settingsProvider) {
+    final provider = Provider.of<SupplementProvider>(context, listen: false);
     final groupedSupplements = _groupSupplementsByTimeOfDay(supplements, settingsProvider);
 
     return ListView(
       padding: const EdgeInsets.all(16),
       children: [
+        // Daily RDA overview header
+        FutureBuilder<Map<String, Map<String, dynamic>>>(
+          future: (() async {
+            if (provider.todayIntakes.isEmpty) return <String, Map<String, dynamic>>{};
+            final dailyItems = <Ingredient>[];
+            for (final intake in provider.todayIntakes) {
+              final supId = intake['supplement_id'] as int;
+              final unitsRaw = intake['unitsTaken'];
+              final double units = unitsRaw is int ? unitsRaw.toDouble() : (unitsRaw as double? ?? 1.0);
+              final matching = provider.supplements.where((s) => s.id == supId);
+              if (matching.isEmpty) continue;
+              final sup = matching.first;
+              for (final ing in sup.ingredients) {
+                dailyItems.add(ing.copyWith(amount: ing.amount * units));
+              }
+            }
+            if (dailyItems.isEmpty) return <String, Map<String, dynamic>>{};
+            final service = RdaService();
+            final agg = await service.aggregateDailyIntake(
+              dailyItems,
+              dateOfBirth: settingsProvider.dateOfBirth,
+              gender: settingsProvider.gender,
+            );
+            // Convert to plain map for UI without depending on service types
+            final result = <String, Map<String, dynamic>>{};
+            agg.forEach((key, value) {
+              final v = value; // dynamic
+              result[key] = {
+                'unitLabel': v.unitLabel,
+                'rdaValue': v.rdaValue,
+                'rdaValueMin': v.rdaValueMin,
+                'rdaValueMax': v.rdaValueMax,
+                'ulValue': v.ulValue,
+                'total': v.totalAmountInRdaUnit,
+                'pctRda': v.percentOfRda,
+                'pctUl': v.percentOfUl,
+                'lifeStage': v.matchedLifeStageLabel,
+                'lifeStageDescription': v.matchedLifeStageDescription,
+                'rdaType': v.rdaType,
+                'note': v.note,
+                'nutrientUl': v.nutrientUl != null
+                    ? {
+                        'value': v.nutrientUl!.value,
+                        'unit': v.nutrientUl!.unit,
+                        'duration': v.nutrientUl!.duration,
+                        'note': v.nutrientUl!.note,
+                      }
+                    : null,
+              };
+            });
+            return result;
+          })(),
+          builder: (context, snapshot) {
+            if (snapshot.connectionState != ConnectionState.done) {
+              return const SizedBox.shrink();
+            }
+            final data = snapshot.data;
+            if (data == null || data.isEmpty) {
+              return const SizedBox.shrink();
+            }
+            return Card(
+              margin: const EdgeInsets.only(bottom: 16),
+              color: Theme.of(context).colorScheme.primaryContainer.withOpacity(0.25),
+              child: Padding(
+                padding: const EdgeInsets.all(12),
+                child: Column(
+                  crossAxisAlignment: CrossAxisAlignment.start,
+                  children: [
+                    Row(
+                      children: [
+                        Icon(Icons.health_and_safety, size: 18, color: Theme.of(context).colorScheme.primary),
+                        const SizedBox(width: 8),
+                        Text(
+                          "Today's intake ",
+                          style: Theme.of(context).textTheme.titleSmall,
+                        ),
+                        Text(
+                          "(Vs Recommended Dietary Allowance)",
+                          style: Theme.of(context).textTheme.labelSmall,
+                        ),
+                        const Spacer(),
+                        IconButton(
+                          tooltip: 'Sources & disclaimer',
+                          icon: const Icon(Icons.info_outline, size: 18),
+                          onPressed: () => _showRdaSourcesSheet(context),
+                        ),
+                      ],
+                    ),
+                    const SizedBox(height: 8),
+                    Wrap(
+                      spacing: 8,
+                      runSpacing: 8,
+                      children: data.entries.map((e) {
+                        final v = e.value;
+                        final double pct = (v['pctRda'] as double?) ?? 0.0;
+                        final double? pctUl = v['pctUl'] as double?;
+                        final pretty = e.key.split('_').map((w) => w.isEmpty ? w : '${w[0].toUpperCase()}${w.substring(1)}').join(' ');
+                        Color bg = Theme.of(context).colorScheme.surfaceVariant.withOpacity(0.5);
+                        if (pctUl != null && pctUl > 100.0) {
+                          bg = (pctUl <= 110.0) ? Colors.amber.withOpacity(0.25) : Colors.red.withOpacity(0.25);
+                        } else if (pct >= 100.0) {
+                          bg = Colors.green.withOpacity(0.25);
+                        }
+                        final color = Theme.of(context).colorScheme.onSurfaceVariant;
+                        return InkWell(
+                          onTap: () {
+                            _showRdaDetailsSheet(context, pretty, v);
+                          },
+                          borderRadius: BorderRadius.circular(8),
+                          child: Container(
+                            padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 6),
+                            decoration: BoxDecoration(
+                              color: bg,
+                              borderRadius: BorderRadius.circular(8),
+                              border: Border.all(color: Theme.of(context).colorScheme.outline.withOpacity(0.3)),
+                            ),
+                            child: Row(
+                              mainAxisSize: MainAxisSize.min,
+                              children: [
+                                Text(
+                                  pretty,
+                                  style: TextStyle(fontSize: 12, fontWeight: FontWeight.w600, color: color),
+                                ),
+                                const SizedBox(width: 6),
+                                Text(
+                                  '${pct.toStringAsFixed(pct >= 10 ? 0 : 1)}%',
+                                  style: TextStyle(fontSize: 12, color: color),
+                                ),
+                                if (pctUl != null) ...[
+                                  const SizedBox(width: 6),
+                                  Icon(
+                                    pctUl > 100.0 ? Icons.warning_amber : Icons.shield_outlined,
+                                    size: 14,
+                                    color: pctUl > 100.0
+                                        ? (pctUl <= 110.0 ? Colors.amber : Colors.red)
+                                        : color,
+                                  ),
+                                ],
+                              ],
+                            ),
+                          ),
+                        );
+                      }).toList(),
+                    ),
+                  ],
+                ),
+              ),
+            );
+          },
+        ),
         if (groupedSupplements['morning']!.isNotEmpty) ...[
           _buildSectionHeader('Morning (${settingsProvider.morningRange})', Icons.wb_sunny, Colors.orange, groupedSupplements['morning']!.length),
           ...groupedSupplements['morning']!.map((supplement) =>
@@ -121,6 +276,7 @@ class SupplementsListScreen extends StatelessWidget {
               onEdit: () => _editSupplement(context, supplement),
               onDelete: () => _deleteSupplement(context, supplement),
               onArchive: () => _archiveSupplement(context, supplement),
+              onDuplicate: () => context.read<SupplementProvider>().duplicateSupplement(supplement.id!),
             ),
           ),
           const SizedBox(height: 16),
@@ -135,6 +291,7 @@ class SupplementsListScreen extends StatelessWidget {
               onEdit: () => _editSupplement(context, supplement),
               onDelete: () => _deleteSupplement(context, supplement),
               onArchive: () => _archiveSupplement(context, supplement),
+              onDuplicate: () => context.read<SupplementProvider>().duplicateSupplement(supplement.id!),
             ),
           ),
           const SizedBox(height: 16),
@@ -149,6 +306,7 @@ class SupplementsListScreen extends StatelessWidget {
               onEdit: () => _editSupplement(context, supplement),
               onDelete: () => _deleteSupplement(context, supplement),
               onArchive: () => _archiveSupplement(context, supplement),
+              onDuplicate: () => context.read<SupplementProvider>().duplicateSupplement(supplement.id!),
             ),
           ),
           const SizedBox(height: 16),
@@ -163,6 +321,7 @@ class SupplementsListScreen extends StatelessWidget {
               onEdit: () => _editSupplement(context, supplement),
               onDelete: () => _deleteSupplement(context, supplement),
               onArchive: () => _archiveSupplement(context, supplement),
+              onDuplicate: () => context.read<SupplementProvider>().duplicateSupplement(supplement.id!),
             ),
           ),
           const SizedBox(height: 16),
@@ -177,6 +336,7 @@ class SupplementsListScreen extends StatelessWidget {
               onEdit: () => _editSupplement(context, supplement),
               onDelete: () => _deleteSupplement(context, supplement),
               onArchive: () => _archiveSupplement(context, supplement),
+              onDuplicate: () => context.read<SupplementProvider>().duplicateSupplement(supplement.id!),
             ),
           ),
         ],
@@ -273,6 +433,248 @@ class SupplementsListScreen extends StatelessWidget {
     return grouped;
   }
 
+  void _showRdaSourcesSheet(BuildContext context) {
+    showModalBottomSheet(
+      context: context,
+      showDragHandle: true,
+      builder: (context) {
+        return Padding(
+          padding: const EdgeInsets.all(16),
+          child: Column(
+            mainAxisSize: MainAxisSize.min,
+            crossAxisAlignment: CrossAxisAlignment.start,
+            children: [
+              Text(
+                'Dietary reference sources',
+                style: Theme.of(context).textTheme.titleMedium,
+              ),
+              const SizedBox(height: 8),
+              Text(
+                'Source: Health Canada Dietary Reference Intakes. Values are matched by your age and sex. Some ULs (e.g., magnesium) apply to supplemental intake only.',
+                style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                      color: Theme.of(context).colorScheme.onSurfaceVariant,
+                    ),
+              ),
+              const SizedBox(height: 12),
+              ListTile(
+                dense: true,
+                contentPadding: EdgeInsets.zero,
+                leading: const Icon(Icons.open_in_new, size: 18),
+                title: const Text(
+                  'Vitamins reference values',
+                  style: TextStyle(fontSize: 13),
+                ),
+                subtitle: const Text(
+                  'canada.ca • reference-values-vitamins',
+                  style: TextStyle(fontSize: 11),
+                ),
+                onTap: () => _launchUrl('https://www.canada.ca/en/health-canada/services/food-nutrition/healthy-eating/dietary-reference-intakes/tables/reference-values-vitamins.html'),
+              ),
+              ListTile(
+                dense: true,
+                contentPadding: EdgeInsets.zero,
+                leading: const Icon(Icons.open_in_new, size: 18),
+                title: const Text(
+                  'Elements (minerals) reference values',
+                  style: TextStyle(fontSize: 13),
+                ),
+                subtitle: const Text(
+                  'canada.ca • reference-values-elements',
+                  style: TextStyle(fontSize: 11),
+                ),
+                onTap: () => _launchUrl('https://www.canada.ca/en/health-canada/services/food-nutrition/healthy-eating/dietary-reference-intakes/tables/reference-values-elements.html'),
+              ),
+              const SizedBox(height: 8),
+              Text(
+                'Disclaimer: Informational only, some of the details in this app are parsed using AI, and may not be accurate. Always consult a healthcare professional for personalized advice.',
+                style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                      color: Theme.of(context).colorScheme.onSurfaceVariant,
+                    ),
+              ),
+            ],
+          ),
+        );
+      },
+    );
+  }
+
+  Future<void> _launchUrl(String url) async {
+    final uri = Uri.parse(url);
+    await launchUrl(uri, mode: LaunchMode.externalApplication);
+  }
+
+  void _showRdaDetailsSheet(BuildContext context, String nutrientPretty, Map<String, dynamic> data) {
+    showModalBottomSheet(
+      context: context,
+      showDragHandle: true,
+      isScrollControlled: false,
+      builder: (context) {
+        final unitLabel = (data['unitLabel'] as String?) ?? '';
+        final rdaValue = data['rdaValue'] as double?;
+        final ulValue = data['ulValue'] as double?;
+        final total = data['total'] as double?;
+        final pctRda = data['pctRda'] as double?;
+        final pctUl = data['pctUl'] as double?;
+        final rdaType = data['rdaType'] as String? ?? '';
+        final lifeStage = data['lifeStage'] as String? ?? '';
+        final note = data['note'] as String?;
+        final lifeStageDesc = data['lifeStageDescription'] as String?;
+        final rdaValueMin = data['rdaValueMin'] as double?;
+        final rdaValueMax = data['rdaValueMax'] as double?;
+        final nutrientUl = (data['nutrientUl'] as Map?)?.cast<String, dynamic>();
+        return Padding(
+          padding: const EdgeInsets.all(16),
+          child: SingleChildScrollView(
+            child: Column(
+              crossAxisAlignment: CrossAxisAlignment.start,
+              mainAxisSize: MainAxisSize.min,
+              children: [
+                // Header row: title and sources button
+                Row(
+                  children: [
+                    Expanded(
+                      child: Text(
+                        nutrientPretty,
+                        style: Theme.of(context).textTheme.titleLarge,
+                        overflow: TextOverflow.ellipsis,
+                      ),
+                    ),
+                    IconButton(
+                      tooltip: 'Sources & disclaimer',
+                      icon: const Icon(Icons.info_outline),
+                      onPressed: () => _showRdaSourcesSheet(context),
+                    ),
+                  ],
+                ),
+                if (lifeStage.isNotEmpty || (lifeStageDesc != null && lifeStageDesc.isNotEmpty)) ...[
+                  const SizedBox(height: 4),
+                  Wrap(
+                    spacing: 8,
+                    runSpacing: 4,
+                    children: [
+                      if (lifeStage.isNotEmpty)
+                        InfoChip(
+                          icon: Icons.person_outline,
+                          label: 'Life stage: $lifeStage',
+                          context: context,
+                        ),
+                      if (lifeStageDesc != null && lifeStageDesc.isNotEmpty)
+                        InfoChip(
+                          icon: Icons.info_outline,
+                          label: lifeStageDesc!,
+                          context: context,
+                        ),
+                    ],
+                  ),
+                ],
+                const SizedBox(height: 8),
+                // Intake vs RDA chips
+                Wrap(
+                  spacing: 8,
+                  runSpacing: 8,
+                  children: [
+                    if (total != null)
+                      InfoChip(
+                        icon: Icons.local_drink,
+                        label: 'Intake: ${total.toStringAsFixed(total % 1 == 0 ? 0 : 1)} $unitLabel',
+                        context: context,
+                      ),
+                    if (rdaValueMin != null && rdaValueMax != null)
+                      InfoChip(
+                        icon: Icons.rule,
+                        label: 'RDA: ${rdaValueMin!.toStringAsFixed(rdaValueMin! % 1 == 0 ? 0 : 1)}–${rdaValueMax!.toStringAsFixed(rdaValueMax! % 1 == 0 ? 0 : 1)} $unitLabel',
+                        context: context,
+                      )
+                    else if (rdaValue != null)
+                      InfoChip(
+                        icon: Icons.rule,
+                        label: 'RDA: ${rdaValue!.toStringAsFixed(rdaValue! % 1 == 0 ? 0 : 1)} $unitLabel',
+                        context: context,
+                      ),
+                    if (pctRda != null)
+                      InfoChip(
+                        icon: Icons.percent,
+                        label: '%RDA: ${pctRda.toStringAsFixed(pctRda >= 10 ? 0 : 1)}%',
+                        context: context,
+                      ),
+                    if (ulValue != null)
+                      InfoChip(
+                        icon: Icons.shield_outlined,
+                        label: 'UL: ${ulValue.toStringAsFixed(ulValue % 1 == 0 ? 0 : 1)} $unitLabel',
+                        context: context,
+                      ),
+                    if (pctUl != null)
+                      InfoChip(
+                        icon: Icons.warning_amber,
+                        label: '%UL: ${pctUl.toStringAsFixed(pctUl >= 10 ? 0 : 1)}%',
+                        context: context,
+                      ),
+                  ],
+                ),
+                if (rdaType.isNotEmpty || (note != null && note!.isNotEmpty) || nutrientUl != null) ...[
+                  const SizedBox(height: 12),
+                  Column(
+                    crossAxisAlignment: CrossAxisAlignment.start,
+                    children: [
+                      if (rdaType.isNotEmpty)
+                        Text(
+                          'Basis: $rdaType',
+                          style: Theme.of(context).textTheme.bodySmall,
+                        ),
+                      if (nutrientUl != null) ...[
+                        const SizedBox(height: 6),
+                        Text(
+                          'Upper limit guidance',
+                          style: Theme.of(context).textTheme.titleSmall,
+                        ),
+                        const SizedBox(height: 4),
+                        Wrap(
+                          spacing: 8,
+                          runSpacing: 4,
+                          children: [
+                            InfoChip(
+                              icon: Icons.shield_moon_outlined,
+                              label: 'UL: ${nutrientUl['value']} ${nutrientUl['unit']}',
+                              context: context,
+                            ),
+                            if ((nutrientUl['duration'] as String?)?.isNotEmpty ?? false)
+                              InfoChip(
+                                icon: Icons.schedule,
+                                label: 'Duration: ${nutrientUl['duration']}',
+                                context: context,
+                              ),
+                          ],
+                        ),
+                        if ((nutrientUl['note'] as String?)?.isNotEmpty ?? false) ...[
+                          const SizedBox(height: 4),
+                          Text(
+                            nutrientUl['note'],
+                            style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                                  color: Theme.of(context).colorScheme.onSurfaceVariant,
+                                ),
+                          ),
+                        ],
+                      ],
+                      if (note != null && note!.isNotEmpty) ...[
+                        const SizedBox(height: 8),
+                        Text(
+                          note!,
+                          style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                                color: Theme.of(context).colorScheme.onSurfaceVariant,
+                              ),
+                        ),
+                      ],
+                    ],
+                  ),
+                ],
+              ],
+            ),
+          ),
+        );
+      },
+    );
+  }
+
   void _showTakeDialog(BuildContext context, Supplement supplement) {
     final unitsController = TextEditingController(text: supplement.numberOfUnits.toString());
     final notesController = TextEditingController();

lib/services/auto_sync_service.dart

@@ -0,0 +1,470 @@
+import 'dart:async';
+import 'dart:io';
+import 'dart:math';
+import 'package:flutter/foundation.dart';
+
+import '../providers/settings_provider.dart';
+import '../providers/simple_sync_provider.dart';
+
+/// Error types for auto-sync operations
+enum AutoSyncErrorType {
+  network,
+  configuration,
+  authentication,
+  server,
+  unknown,
+}
+
+/// Represents an auto-sync error with context
+class AutoSyncError {
+  final AutoSyncErrorType type;
+  final String message;
+  final DateTime timestamp;
+  final dynamic originalError;
+
+  AutoSyncError({
+    required this.type,
+    required this.message,
+    required this.timestamp,
+    this.originalError,
+  });
+
+  @override
+  String toString() => 'AutoSyncError($type): $message';
+}
+
+/// Service that handles automatic synchronization with debouncing logic
+/// to prevent excessive sync requests when multiple data changes occur rapidly.
+class AutoSyncService {
+  Timer? _debounceTimer;
+  bool _syncInProgress = false;
+  bool _hasPendingSync = false;
+  
+  // Error handling and retry logic
+  final List<AutoSyncError> _recentErrors = [];
+  int _consecutiveFailures = 0;
+  DateTime? _lastFailureTime;
+  Timer? _retryTimer;
+  bool _autoDisabledDueToErrors = false;
+  
+  // Exponential backoff configuration
+  static const int _maxRetryAttempts = 5;
+  static const int _baseRetryDelaySeconds = 30;
+  static const int _maxRetryDelaySeconds = 300; // 5 minutes
+  static const int _errorHistoryMaxSize = 10;
+  static const int _autoDisableThreshold = 3; // Consecutive failures before auto-disable
+  
+  final SimpleSyncProvider _syncProvider;
+  final SettingsProvider _settingsProvider;
+  
+  AutoSyncService({
+    required SimpleSyncProvider syncProvider,
+    required SettingsProvider settingsProvider,
+  }) : _syncProvider = syncProvider,
+       _settingsProvider = settingsProvider;
+
+  /// Triggers an auto-sync if enabled in settings.
+  /// Uses debouncing to prevent excessive sync requests.
+  void triggerAutoSync() {
+    // Check if auto-sync is enabled
+    if (!_settingsProvider.autoSyncEnabled) {
+      if (kDebugMode) {
+        print('AutoSyncService: Auto-sync is disabled, skipping trigger');
+      }
+      return;
+    }
+
+    // Check if auto-sync was disabled due to persistent errors
+    if (_autoDisabledDueToErrors) {
+      if (kDebugMode) {
+        print('AutoSyncService: Auto-sync disabled due to persistent errors, skipping trigger');
+      }
+      return;
+    }
+
+    // Check if sync is configured
+    if (!_syncProvider.isConfigured) {
+      _recordError(AutoSyncError(
+        type: AutoSyncErrorType.configuration,
+        message: 'Sync not configured. Please configure cloud sync settings.',
+        timestamp: DateTime.now(),
+      ));
+      if (kDebugMode) {
+        print('AutoSyncService: Sync not configured, skipping auto-sync');
+      }
+      return;
+    }
+
+    // If sync is already in progress, mark that we have a pending sync
+    if (_syncInProgress || _syncProvider.isSyncing) {
+      _hasPendingSync = true;
+      if (kDebugMode) {
+        print('AutoSyncService: Sync in progress, marking pending sync');
+      }
+      return;
+    }
+
+    // Cancel existing timer if one is running
+    _cancelPendingSync();
+
+    // Check if we should apply exponential backoff
+    final backoffDelay = _calculateBackoffDelay();
+    if (backoffDelay > 0) {
+      if (kDebugMode) {
+        print('AutoSyncService: Applying backoff delay of ${backoffDelay}s due to recent failures');
+      }
+      _debounceTimer = Timer(Duration(seconds: backoffDelay), () {
+        _executePendingSync();
+      });
+      return;
+    }
+
+    // Start new debounce timer
+    final debounceSeconds = _settingsProvider.autoSyncDebounceSeconds;
+    _debounceTimer = Timer(Duration(seconds: debounceSeconds), () {
+      _executePendingSync();
+    });
+
+    if (kDebugMode) {
+      print('AutoSyncService: Auto-sync scheduled in ${debounceSeconds}s');
+    }
+  }
+
+  /// Executes the pending sync operation
+  Future<void> _executePendingSync() async {
+    // Double-check conditions before executing
+    if (!_settingsProvider.autoSyncEnabled) {
+      if (kDebugMode) {
+        print('AutoSyncService: Auto-sync disabled during execution, aborting');
+      }
+      return;
+    }
+
+    if (_autoDisabledDueToErrors) {
+      if (kDebugMode) {
+        print('AutoSyncService: Auto-sync disabled due to errors during execution, aborting');
+      }
+      return;
+    }
+
+    if (!_syncProvider.isConfigured) {
+      _recordError(AutoSyncError(
+        type: AutoSyncErrorType.configuration,
+        message: 'Sync not configured during execution',
+        timestamp: DateTime.now(),
+      ));
+      if (kDebugMode) {
+        print('AutoSyncService: Sync not configured during execution, aborting');
+      }
+      return;
+    }
+
+    if (_syncInProgress || _syncProvider.isSyncing) {
+      if (kDebugMode) {
+        print('AutoSyncService: Sync already in progress during execution, aborting');
+      }
+      return;
+    }
+
+    _syncInProgress = true;
+    _hasPendingSync = false;
+
+    try {
+      if (kDebugMode) {
+        print('AutoSyncService: Executing auto-sync (attempt ${_consecutiveFailures + 1})');
+      }
+      
+      // Check network connectivity before attempting sync
+      if (!await _isNetworkAvailable()) {
+        throw AutoSyncError(
+          type: AutoSyncErrorType.network,
+          message: 'Network is not available',
+          timestamp: DateTime.now(),
+        );
+      }
+      
+      await _syncProvider.syncDatabase(isAutoSync: true);
+      
+      // Reset failure count on successful sync
+      _consecutiveFailures = 0;
+      _lastFailureTime = null;
+      _autoDisabledDueToErrors = false;
+      
+      if (kDebugMode) {
+        print('AutoSyncService: Auto-sync completed successfully');
+      }
+      
+    } catch (e) {
+      if (kDebugMode) {
+        print('AutoSyncService: Auto-sync failed: $e');
+      }
+      
+      // Handle specific error types
+      _handleSyncError(e);
+      
+    } finally {
+      _syncInProgress = false;
+      
+      // If there was a pending sync request while we were syncing, trigger it
+      if (_hasPendingSync && !_autoDisabledDueToErrors) {
+        if (kDebugMode) {
+          print('AutoSyncService: Processing queued sync request');
+        }
+        _hasPendingSync = false;
+        // Use a small delay to avoid immediate re-triggering
+        Timer(const Duration(milliseconds: 500), () {
+          triggerAutoSync();
+        });
+      }
+    }
+  }
+
+  /// Handles sync errors with appropriate recovery strategies
+  void _handleSyncError(dynamic error) {
+    _consecutiveFailures++;
+    _lastFailureTime = DateTime.now();
+    
+    final autoSyncError = _categorizeError(error);
+    _recordError(autoSyncError);
+    
+    // Check if we should disable auto-sync due to persistent errors
+    if (_consecutiveFailures >= _autoDisableThreshold) {
+      _autoDisabledDueToErrors = true;
+      if (kDebugMode) {
+        print('AutoSyncService: Auto-sync disabled due to ${_consecutiveFailures} consecutive failures');
+      }
+      
+      // For configuration errors, disable immediately
+      if (autoSyncError.type == AutoSyncErrorType.configuration ||
+          autoSyncError.type == AutoSyncErrorType.authentication) {
+        if (kDebugMode) {
+          print('AutoSyncService: Auto-sync disabled due to configuration/authentication error');
+        }
+      }
+    }
+    
+    // Schedule retry for recoverable errors (unless auto-disabled)
+    if (!_autoDisabledDueToErrors && _shouldRetry(autoSyncError.type)) {
+      _scheduleRetry();
+    }
+  }
+
+  /// Categorizes an error into a specific AutoSyncError type
+  AutoSyncError _categorizeError(dynamic error) {
+    final errorString = error.toString().toLowerCase();
+    
+    // Network-related errors
+    if (error is SocketException ||
+        errorString.contains('network') || 
+        errorString.contains('connection') ||
+        errorString.contains('timeout') ||
+        errorString.contains('unreachable') ||
+        errorString.contains('host lookup failed') ||
+        errorString.contains('no route to host')) {
+      return AutoSyncError(
+        type: AutoSyncErrorType.network,
+        message: 'Network connection failed. Check your internet connection.',
+        timestamp: DateTime.now(),
+        originalError: error,
+      );
+    }
+    
+    // Configuration-related errors
+    if (errorString.contains('not configured') ||
+        errorString.contains('invalid url') ||
+        errorString.contains('malformed url')) {
+      return AutoSyncError(
+        type: AutoSyncErrorType.configuration,
+        message: 'Sync configuration is invalid. Please check your sync settings.',
+        timestamp: DateTime.now(),
+        originalError: error,
+      );
+    }
+    
+    // Authentication errors
+    if (errorString.contains('authentication') ||
+        errorString.contains('unauthorized') ||
+        errorString.contains('401') ||
+        errorString.contains('403') ||
+        errorString.contains('invalid credentials')) {
+      return AutoSyncError(
+        type: AutoSyncErrorType.authentication,
+        message: 'Authentication failed. Please check your username and password.',
+        timestamp: DateTime.now(),
+        originalError: error,
+      );
+    }
+    
+    // Server errors
+    if (errorString.contains('500') ||
+        errorString.contains('502') ||
+        errorString.contains('503') ||
+        errorString.contains('504') ||
+        errorString.contains('server error')) {
+      return AutoSyncError(
+        type: AutoSyncErrorType.server,
+        message: 'Server error occurred. The sync server may be temporarily unavailable.',
+        timestamp: DateTime.now(),
+        originalError: error,
+      );
+    }
+    
+    // Unknown errors
+    return AutoSyncError(
+      type: AutoSyncErrorType.unknown,
+      message: 'An unexpected error occurred during sync: ${error.toString()}',
+      timestamp: DateTime.now(),
+      originalError: error,
+    );
+  }
+
+  /// Records an error in the recent errors list
+  void _recordError(AutoSyncError error) {
+    _recentErrors.add(error);
+    
+    // Keep only recent errors
+    if (_recentErrors.length > _errorHistoryMaxSize) {
+      _recentErrors.removeAt(0);
+    }
+    
+    if (kDebugMode) {
+      print('AutoSyncService: Recorded error: $error');
+    }
+  }
+
+  /// Determines if we should retry for a given error type
+  bool _shouldRetry(AutoSyncErrorType errorType) {
+    switch (errorType) {
+      case AutoSyncErrorType.network:
+      case AutoSyncErrorType.server:
+        return _consecutiveFailures < _maxRetryAttempts;
+      case AutoSyncErrorType.configuration:
+      case AutoSyncErrorType.authentication:
+        return false; // Don't retry config/auth errors
+      case AutoSyncErrorType.unknown:
+        return _consecutiveFailures < _maxRetryAttempts;
+    }
+  }
+
+  /// Calculates the backoff delay based on consecutive failures
+  int _calculateBackoffDelay() {
+    if (_consecutiveFailures == 0 || _lastFailureTime == null) {
+      return 0;
+    }
+    
+    // Calculate exponential backoff: base * (2^failures)
+    final backoffSeconds = min(
+      _baseRetryDelaySeconds * pow(2, _consecutiveFailures - 1).toInt(),
+      _maxRetryDelaySeconds,
+    );
+    
+    // Check if enough time has passed since last failure
+    final timeSinceLastFailure = DateTime.now().difference(_lastFailureTime!).inSeconds;
+    if (timeSinceLastFailure >= backoffSeconds) {
+      return 0; // No additional delay needed
+    }
+    
+    return backoffSeconds - timeSinceLastFailure;
+  }
+
+  /// Schedules a retry attempt with exponential backoff
+  void _scheduleRetry() {
+    final retryDelay = _calculateBackoffDelay();
+    if (retryDelay <= 0) return;
+    
+    _retryTimer?.cancel();
+    _retryTimer = Timer(Duration(seconds: retryDelay), () {
+      if (kDebugMode) {
+        print('AutoSyncService: Retrying auto-sync after backoff delay');
+      }
+      triggerAutoSync();
+    });
+    
+    if (kDebugMode) {
+      print('AutoSyncService: Scheduled retry in ${retryDelay}s');
+    }
+  }
+
+  /// Checks if network is available
+  Future<bool> _isNetworkAvailable() async {
+    try {
+      final result = await InternetAddress.lookup('google.com');
+      return result.isNotEmpty && result[0].rawAddress.isNotEmpty;
+    } catch (e) {
+      if (kDebugMode) {
+        print('AutoSyncService: Network check failed: $e');
+      }
+      return false;
+    }
+  }
+
+  /// Cancels any pending sync operation
+  void cancelPendingSync() {
+    _cancelPendingSync();
+    _retryTimer?.cancel();
+    _retryTimer = null;
+    _hasPendingSync = false;
+    
+    if (kDebugMode) {
+      print('AutoSyncService: Cancelled pending sync and retry timer');
+    }
+  }
+
+  /// Internal method to cancel the debounce timer
+  void _cancelPendingSync() {
+    _debounceTimer?.cancel();
+    _debounceTimer = null;
+  }
+
+  /// Resets error state and re-enables auto-sync if it was disabled
+  void resetErrorState() {
+    _consecutiveFailures = 0;
+    _lastFailureTime = null;
+    _autoDisabledDueToErrors = false;
+    _recentErrors.clear();
+    _retryTimer?.cancel();
+    _retryTimer = null;
+    
+    if (kDebugMode) {
+      print('AutoSyncService: Error state reset, auto-sync re-enabled');
+    }
+  }
+
+  /// Disposes of the service and cleans up resources
+  void dispose() {
+    _cancelPendingSync();
+    _retryTimer?.cancel();
+    _retryTimer = null;
+    _hasPendingSync = false;
+    _syncInProgress = false;
+    _recentErrors.clear();
+    
+    if (kDebugMode) {
+      print('AutoSyncService: Disposed');
+    }
+  }
+
+  /// Returns true if there is a pending sync operation
+  bool get hasPendingSync => _hasPendingSync || _debounceTimer != null;
+
+  /// Returns true if a sync is currently in progress
+  bool get isSyncInProgress => _syncInProgress;
+
+  /// Returns true if auto-sync was disabled due to persistent errors
+  bool get isAutoDisabledDueToErrors => _autoDisabledDueToErrors;
+
+  /// Returns the number of consecutive failures
+  int get consecutiveFailures => _consecutiveFailures;
+
+  /// Returns a copy of recent errors
+  List<AutoSyncError> get recentErrors => List.unmodifiable(_recentErrors);
+
+  /// Returns the last error message suitable for display to users
+  String? get lastErrorMessage {
+    if (_recentErrors.isEmpty) return null;
+    return _recentErrors.last.message;
+  }
+
+  /// Returns true if a retry is currently scheduled
+  bool get hasScheduledRetry => _retryTimer != null;
+}

lib/services/database_sync_service.dart

@@ -289,19 +289,23 @@ class DatabaseSyncService {
 
     // Get all supplements from remote database
     final remoteMaps = await remoteDb.query('supplements');
-    final remoteSupplements = remoteMaps.map((map) => Supplement.fromMap(map)).toList();
+    final remoteSupplements =
+        remoteMaps.map((map) => Supplement.fromMap(map)).toList();
 
     if (kDebugMode) {
-      print('SupplementsLog: Found ${remoteSupplements.length} supplements in remote database');
+      print(
+          'SupplementsLog: Found ${remoteSupplements.length} supplements in remote database');
       for (final supplement in remoteSupplements) {
-        print('SupplementsLog: Remote supplement: ${supplement.name} (syncId: ${supplement.syncId}, deleted: ${supplement.isDeleted})');
+        print(
+            'SupplementsLog: Remote supplement: ${supplement.name} (syncId: ${supplement.syncId}, deleted: ${supplement.isDeleted})');
       }
     }
 
     for (final remoteSupplement in remoteSupplements) {
       if (remoteSupplement.syncId.isEmpty) {
         if (kDebugMode) {
-          print('SupplementsLog: Skipping supplement ${remoteSupplement.name} - no syncId');
+          print(
+              'SupplementsLog: Skipping supplement ${remoteSupplement.name} - no syncId');
         }
         continue;
       }
@@ -316,22 +320,28 @@ class DatabaseSyncService {
       if (existingMaps.isEmpty) {
         // New supplement from remote - insert it
         if (!remoteSupplement.isDeleted) {
-          final supplementToInsert = remoteSupplement.copyWith(id: null);
-          await localDb.insert('supplements', supplementToInsert.toMap());
+          // Manually create a new map without the id to ensure it's null
+          final mapToInsert = remoteSupplement.toMap();
+          mapToInsert.remove('id');
+          await localDb.insert('supplements', mapToInsert);
           if (kDebugMode) {
-            print('SupplementsLog: ✓ Inserted new supplement: ${remoteSupplement.name}');
+            print(
+                'SupplementsLog: ✓ Inserted new supplement: ${remoteSupplement.name}');
           }
         } else {
           if (kDebugMode) {
-            print('SupplementsLog: Skipping deleted supplement: ${remoteSupplement.name}');
+            print(
+                'SupplementsLog: Skipping deleted supplement: ${remoteSupplement.name}');
           }
         }
       } else {
         // Existing supplement - update if remote is newer
         final existingSupplement = Supplement.fromMap(existingMaps.first);
 
-        if (remoteSupplement.lastModified.isAfter(existingSupplement.lastModified)) {
-          final supplementToUpdate = remoteSupplement.copyWith(id: existingSupplement.id);
+        if (remoteSupplement.lastModified
+            .isAfter(existingSupplement.lastModified)) {
+          final supplementToUpdate =
+              remoteSupplement.copyWith(id: existingSupplement.id);
           await localDb.update(
             'supplements',
             supplementToUpdate.toMap(),
@@ -339,11 +349,13 @@ class DatabaseSyncService {
             whereArgs: [existingSupplement.id],
           );
           if (kDebugMode) {
-            print('SupplementsLog: ✓ Updated supplement: ${remoteSupplement.name}');
+            print(
+                'SupplementsLog: ✓ Updated supplement: ${remoteSupplement.name}');
           }
         } else {
           if (kDebugMode) {
-            print('SupplementsLog: Local supplement ${remoteSupplement.name} is newer, keeping local version');
+            print(
+                'SupplementsLog: Local supplement ${remoteSupplement.name} is newer, keeping local version');
           }
         }
       }

lib/services/notification_service.dart

@@ -173,20 +173,35 @@ class NotificationService {
           // Call the callback to record the intake
           if (_onTakeSupplementCallback != null) {
             print('SupplementsLog: 📱 Calling supplement callback...');
-            _onTakeSupplementCallback!(supplementId, supplementName, units, unitType);
+            _onTakeSupplementCallback!(
+                supplementId, supplementName, units, unitType);
             print('SupplementsLog: 📱 Callback completed');
           } else {
             print('SupplementsLog: 📱 ERROR: No callback registered!');
           }
 
+          // For retry notifications, the original notification ID is in the payload
+          int originalNotificationId;
+          if (parts.length > 4 && int.tryParse(parts[4]) != null) {
+            originalNotificationId = int.parse(parts[4]);
+            print(
+                'SupplementsLog: 📱 Retry notification detected. Original ID: $originalNotificationId');
+          } else if (notificationId != null) {
+            originalNotificationId = notificationId;
+          } else {
+            print(
+                'SupplementsLog: 📱 ERROR: Could not determine notification ID to cancel.');
+            return;
+          }
+
           // Mark notification as taken in database (this will cancel any pending retries)
-          if (notificationId != null) {
-            print('SupplementsLog: 📱 Marking notification $notificationId as taken');
-            await DatabaseHelper.instance.markNotificationTaken(notificationId);
+          print(
+              'SupplementsLog: 📱 Marking notification $originalNotificationId as taken');
+          await DatabaseHelper.instance
+              .markNotificationTaken(originalNotificationId);
 
           // Cancel any pending retry notifications for this notification
-            _cancelRetryNotifications(notificationId);
-          }
+          _cancelRetryNotifications(originalNotificationId);
 
           // Show a confirmation notification
           print('SupplementsLog: 📱 Showing confirmation notification...');
@@ -195,7 +210,8 @@ class NotificationService {
             '$supplementName has been recorded at ${DateTime.now().hour.toString().padLeft(2, '0')}:${DateTime.now().minute.toString().padLeft(2, '0')}',
           );
         } else {
-          print('SupplementsLog: 📱 ERROR: Invalid payload format - not enough parts');
+          print(
+              'SupplementsLog: 📱 ERROR: Invalid payload format - not enough parts');
         }
       } catch (e) {
         print('SupplementsLog: 📱 ERROR in _handleTakeAction: $e');

lib/services/nutrient_data_service.dart

@@ -0,0 +1,40 @@
+import 'dart:convert';
+
+import 'package:flutter/services.dart';
+
+import '../models/nutrient.dart';
+
+class NutrientDataService {
+  static final NutrientDataService _instance = NutrientDataService._internal();
+
+  factory NutrientDataService() {
+    return _instance;
+  }
+
+  NutrientDataService._internal();
+
+  List<Nutrient>? _nutrients;
+
+  Future<List<Nutrient>> get nutrients async {
+    if (_nutrients != null) {
+      return _nutrients!;
+    }
+    await _loadNutrientData();
+    return _nutrients!;
+  }
+
+  Future<void> _loadNutrientData() async {
+    try {
+      final String response = await rootBundle.loadString('assets/canada_health.json');
+      final data = await json.decode(response);
+      final nutrientsData = data['nutrients'] as Map<String, dynamic>;
+
+      _nutrients = nutrientsData.entries.map((entry) {
+        return Nutrient.fromJson(entry.key, entry.value);
+      }).toList();
+    } catch (e) {
+      print('Error loading nutrient data: $e');
+      _nutrients = [];
+    }
+  }
+}

lib/services/rda_service.dart

@@ -0,0 +1,617 @@
+import 'dart:async';
+import 'dart:math';
+
+import '../models/ingredient.dart';
+import '../models/nutrient.dart';
+import 'nutrient_data_service.dart';
+
+/// Represents an RDA/AI match for a user and nutrient
+class RdaResult {
+  final String nutrientKey;
+  final String unitLabel; // e.g., "mg/day", "µg/day (RAE)"
+  final String rdaType; // "RDA/AI" or "AI"
+  final double value; // RDA/AI value in the units of unitLabel
+  final double? valueMin; // Optional minimum recommended value
+  final double? valueMax; // Optional maximum recommended value
+  final double? ul; // Upper limit (if provided) in the same base units as unitLabel (life-stage)
+  final String matchedLifeStageLabel; // e.g., "19-30 y", "51-70 y"
+  final String? lifeStageDescription; // Optional description for the life stage (e.g., maintenance/loading)
+  final UpperLimit? nutrientUl; // Nutrient-level UL (object with unit/duration/note), if available
+  final String? note; // Optional dataset note (e.g., magnesium UL is supplemental only)
+
+  const RdaResult({
+    required this.nutrientKey,
+    required this.unitLabel,
+    required this.rdaType,
+    required this.value,
+    this.valueMin,
+    this.valueMax,
+    required this.ul,
+    required this.matchedLifeStageLabel,
+    this.lifeStageDescription,
+    this.nutrientUl,
+    this.note,
+  });
+}
+
+/// Aggregated daily overview by nutrient
+class RdaAggregate {
+  final String nutrientKey;
+  final String unitLabel; // RDA unit label
+  final double rdaValue; // Midpoint of range when available
+  final double? rdaValueMin; // Optional minimum recommended value
+  final double? rdaValueMax; // Optional maximum recommended value
+  final double? ulValue;
+  final double totalAmountInRdaUnit; // Total intake converted to RDA units
+  final double percentOfRda; // 0..100+ (may exceed 100)
+  final double? percentOfUl; // 0..100+ (may exceed 100)
+  final String? matchedLifeStageLabel; // e.g., "19-30 y"
+  final String? matchedLifeStageDescription; // Optional description for the life stage
+  final String? rdaType; // e.g., "RDA/AI" or "AI"
+  final UpperLimit? nutrientUl; // Nutrient-level UL object (unit/duration/note)
+  final String? note; // Optional dataset note
+
+  const RdaAggregate({
+    required this.nutrientKey,
+    required this.unitLabel,
+    required this.rdaValue,
+    this.rdaValueMin,
+    this.rdaValueMax,
+    required this.ulValue,
+    required this.totalAmountInRdaUnit,
+    required this.percentOfRda,
+    required this.percentOfUl,
+    this.matchedLifeStageLabel,
+    this.matchedLifeStageDescription,
+    this.rdaType,
+    this.nutrientUl,
+    this.note,
+  });
+}
+
+/// Service for working with Health Canada DRIs (RDA/AI and UL)
+/// - Maps app ingredient names to nutrient keys in canada_health.json
+/// - Computes user-specific RDA/AI and UL values based on age and gender
+/// - Converts units and calculates % of RDA/AI and % of UL
+class RdaService {
+  RdaService._internal();
+
+  static final RdaService _instance = RdaService._internal();
+
+  factory RdaService() => _instance;
+
+  final NutrientDataService _nutrientDataService = NutrientDataService();
+
+  // Cache nutrients by key: e.g., "vitamin_d"
+  Map<String, Nutrient>? _nutrientsByKey;
+
+  // Known alias mapping for common ingredient names to nutrient keys
+  // Keys must be lowercase for matching
+  static const Map<String, String> _aliasToNutrientKey = {
+    // Vitamin C
+    'vitamin c': 'vitamin_c',
+    'ascorbic acid': 'vitamin_c',
+
+    // Vitamin D
+    'vitamin d': 'vitamin_d',
+    'vitamin d3': 'vitamin_d',
+    'cholecalciferol': 'vitamin_d',
+    'vitamin d2': 'vitamin_d', // ergocalciferol - treat same RDA
+
+    // Vitamin A (RAE)
+    'vitamin a': 'vitamin_a',
+    'retinol': 'vitamin_a',
+    'beta-carotene': 'vitamin_a',
+
+    // Vitamin E (alpha-tocopherol)
+    'vitamin e': 'vitamin_e',
+    'alpha tocopherol': 'vitamin_e',
+    'alpha-tocopherol': 'vitamin_e',
+
+    // Vitamin K (K1/K2 common mapping to total Vitamin K AI)
+    'vitamin k': 'vitamin_k',
+    'vitamin k1': 'vitamin_k',
+    'phylloquinone': 'vitamin_k',
+    'vitamin k2': 'vitamin_k',
+    'menaquinone': 'vitamin_k',
+
+    // B1 (Thiamine)
+    'vitamin b1': 'vitamin_b1',
+    'thiamine': 'vitamin_b1',
+    'thiamin': 'vitamin_b1',
+
+    // B2 (Riboflavin)
+    'vitamin b2': 'vitamin_b2',
+    'riboflavin': 'vitamin_b2',
+
+    // Folate
+    'folate': 'folate_dfe',
+    'folic acid': 'folate_dfe',
+    'folate (dfe)': 'folate_dfe',
+    'dfe': 'folate_dfe',
+  };
+
+  // RDA result and aggregate types moved to top-level (Dart doesn't support nested classes)
+
+  /// Get a user-specific RDA result for a given ingredient name.
+  /// - Resolves the ingredient to a nutrient key using aliases and simple heuristics.
+  /// - Computes the appropriate life-stage record based on age and gender.
+  ///
+  /// If the ingredient doesn't map to a known nutrient or no life stage matches,
+  /// returns null.
+  Future<RdaResult?> getUserRdaForIngredient(
+    String ingredientName, {
+    DateTime? dateOfBirth,
+    String? gender, // expected values similar to ['Male','Female','Other','Prefer not to say']
+  }) async {
+    final key = await mapIngredientToNutrientKey(ingredientName);
+    if (key == null) return null;
+    return getUserRdaForNutrientKey(
+      key,
+      dateOfBirth: dateOfBirth,
+      gender: gender,
+    );
+  }
+
+  /// Get a user-specific RDA result for a known nutrient key
+  /// e.g., "vitamin_d", "vitamin_c".
+  Future<RdaResult?> getUserRdaForNutrientKey(
+    String nutrientKey, {
+    DateTime? dateOfBirth,
+    String? gender,
+  }) async {
+    final nutrient = await _getNutrientByKey(nutrientKey);
+    if (nutrient == null) return null;
+
+    final _UserProfile profile = _UserProfile.from(dateOfBirth: dateOfBirth, gender: gender);
+    final LifeStage? stage = _matchLifeStageForProfile(nutrient.lifeStages, profile);
+
+    if (stage == null) return null;
+
+    return RdaResult(
+      nutrientKey: nutrientKey,
+      unitLabel: nutrient.unit,
+      rdaType: nutrient.rdaType,
+      value: stage.value,
+      valueMin: stage.valueMin,
+      valueMax: stage.valueMax,
+      ul: stage.ul,
+      matchedLifeStageLabel: stage.ageRange,
+      lifeStageDescription: stage.description,
+      nutrientUl: nutrient.ul,
+      note: nutrient.note,
+    );
+  }
+
+  /// Compute % of RDA and % of UL for a single ingredient dose.
+  /// - Resolves ingredient to nutrient key
+  /// - Converts the amount+unit to the RDA unit base for that nutrient
+  /// - Calculates percent of RDA and UL
+  ///
+  /// Returns null if the ingredient cannot be mapped or units cannot be converted.
+  Future<RdaAggregate?> computePercentForDose(
+    String ingredientName,
+    double amount,
+    String unit, {
+    DateTime? dateOfBirth,
+    String? gender,
+  }) async {
+    final rda = await getUserRdaForIngredient(
+      ingredientName,
+      dateOfBirth: dateOfBirth,
+      gender: gender,
+    );
+    if (rda == null) return null;
+
+    final String rdaUnitSymbol = _unitSymbolFromLabel(rda.unitLabel); // "mg" or "ug"
+    final String normalizedInputUnit = _normalizeUnit(unit);
+
+    final double? amountInRdaUnit = _convertAmountToTargetUnit(
+      ingredientName: ingredientName,
+      amount: amount,
+      fromUnit: normalizedInputUnit,
+      toUnit: rdaUnitSymbol,
+    );
+
+    if (amountInRdaUnit == null) return null;
+
+    final double rdaForCalc = (rda.valueMin != null && rda.valueMax != null)
+        ? ((rda.valueMin! + rda.valueMax!) / 2.0)
+        : rda.value;
+    final double percentOfRda = (amountInRdaUnit / rdaForCalc) * 100.0;
+    final double? percentOfUl =
+        rda.ul != null && rda.ul! > 0 ? (amountInRdaUnit / rda.ul!) * 100.0 : null;
+
+    return RdaAggregate(
+      nutrientKey: rda.nutrientKey,
+      unitLabel: rda.unitLabel,
+      rdaValue: rdaForCalc,
+      rdaValueMin: rda.valueMin,
+      rdaValueMax: rda.valueMax,
+      ulValue: rda.ul,
+      totalAmountInRdaUnit: amountInRdaUnit,
+      percentOfRda: percentOfRda,
+      percentOfUl: percentOfUl,
+      matchedLifeStageLabel: rda.matchedLifeStageLabel,
+      matchedLifeStageDescription: rda.lifeStageDescription,
+      rdaType: rda.rdaType,
+      nutrientUl: rda.nutrientUl,
+      note: rda.note,
+    );
+  }
+
+  /// Aggregate multiple ingredients (e.g., full-day intake) into user-specific RDA overview.
+  /// - Sums all ingredients mapped to the same nutrient
+  /// - Converts units to the RDA base unit
+  /// - Returns map keyed by nutrientKey
+  Future<Map<String, RdaAggregate>> aggregateDailyIntake(
+    List<Ingredient> ingredients, {
+    DateTime? dateOfBirth,
+    String? gender,
+  }) async {
+    final Map<String, double> totalsByNutrient = {};
+    final Map<String, RdaResult> rdaByNutrient = {};
+
+    for (final ing in ingredients) {
+      final key = await mapIngredientToNutrientKey(ing.name);
+      if (key == null) continue;
+
+      // Ensure RDA is loaded for the nutrient
+      rdaByNutrient[key] = rdaByNutrient[key] ??
+          (await getUserRdaForNutrientKey(key, dateOfBirth: dateOfBirth, gender: gender))!;
+
+      final rda = rdaByNutrient[key];
+      if (rda == null) continue; // no match for this nutrient
+
+      final String rdaUnitSymbol = _unitSymbolFromLabel(rda.unitLabel);
+      final double? converted = _convertAmountToTargetUnit(
+        ingredientName: ing.name,
+        amount: ing.amount,
+        fromUnit: _normalizeUnit(ing.unit),
+        toUnit: rdaUnitSymbol,
+      );
+      if (converted == null) continue;
+
+      totalsByNutrient[key] = (totalsByNutrient[key] ?? 0.0) + converted;
+    }
+
+    final Map<String, RdaAggregate> result = {};
+    for (final entry in totalsByNutrient.entries) {
+      final key = entry.key;
+      final total = entry.value;
+      final rda = rdaByNutrient[key];
+      if (rda == null) continue;
+      final double rdaForCalc = (rda.valueMin != null && rda.valueMax != null)
+          ? ((rda.valueMin! + rda.valueMax!) / 2.0)
+          : rda.value;
+      final double percentOfRda = (total / rdaForCalc) * 100.0;
+      final double? percentOfUl = rda.ul != null && rda.ul! > 0 ? (total / rda.ul!) * 100.0 : null;
+
+      result[key] = RdaAggregate(
+        nutrientKey: key,
+        unitLabel: rda.unitLabel,
+        rdaValue: rdaForCalc,
+        rdaValueMin: rda.valueMin,
+        rdaValueMax: rda.valueMax,
+        ulValue: rda.ul,
+        totalAmountInRdaUnit: total,
+        percentOfRda: percentOfRda,
+        percentOfUl: percentOfUl,
+        matchedLifeStageLabel: rda.matchedLifeStageLabel,
+        matchedLifeStageDescription: rda.lifeStageDescription,
+        rdaType: rda.rdaType,
+        nutrientUl: rda.nutrientUl,
+        note: rda.note,
+      );
+    }
+
+    return result;
+  }
+
+  /// Map an ingredient name (e.g., "Vitamin D3") to a nutrient key (e.g., "vitamin_d") used in canada_health.json
+  /// Returns null if no mapping is found.
+  Future<String?> mapIngredientToNutrientKey(String ingredientName) async {
+    await _ensureNutrientsLoaded();
+
+    final String cleaned = _normalizeIngredientName(ingredientName);
+
+    // Direct alias mapping
+    final direct = _aliasToNutrientKey[cleaned];
+    if (direct != null && _nutrientsByKey!.containsKey(direct)) return direct;
+
+    // Heuristic contains-based mapping
+    if (cleaned.contains('vitamin d')) return _nutrientsByKey!.containsKey('vitamin_d') ? 'vitamin_d' : null;
+    if (cleaned.contains('vitamin c')) return _nutrientsByKey!.containsKey('vitamin_c') ? 'vitamin_c' : null;
+    if (cleaned.contains('vitamin a') || cleaned.contains('retinol') || cleaned.contains('beta carotene')) {
+      return _nutrientsByKey!.containsKey('vitamin_a') ? 'vitamin_a' : null;
+    }
+    if (cleaned.contains('vitamin e') || cleaned.contains('alpha tocopherol') || cleaned.contains('alpha-tocopherol')) {
+      return _nutrientsByKey!.containsKey('vitamin_e') ? 'vitamin_e' : null;
+    }
+    if (cleaned.contains('vitamin k') || cleaned.contains('phylloquinone') || cleaned.contains('menaquinone')) {
+      return _nutrientsByKey!.containsKey('vitamin_k') ? 'vitamin_k' : null;
+    }
+    if (cleaned.contains('b1') || cleaned.contains('thiamin') || cleaned.contains('thiamine')) {
+      return _nutrientsByKey!.containsKey('vitamin_b1') ? 'vitamin_b1' : null;
+    }
+    if (cleaned.contains('b2') || cleaned.contains('riboflavin')) {
+      return _nutrientsByKey!.containsKey('vitamin_b2') ? 'vitamin_b2' : null;
+    }
+    if (cleaned.contains('folate') || cleaned.contains('folic')) {
+      return _nutrientsByKey!.containsKey('folate_dfe') ? 'folate_dfe' : null;
+    }
+    if (cleaned.contains('vitamin b3') || cleaned.contains('niacin') || cleaned.contains('nicotinic acid') || cleaned.contains('niacinamide')) {
+      return _nutrientsByKey!.containsKey('vitamin_b3') ? 'vitamin_b3' : null;
+    }
+    if (cleaned.contains('vitamin b5') || cleaned.contains('pantothenic')) {
+      return _nutrientsByKey!.containsKey('vitamin_b5') ? 'vitamin_b5' : null;
+    }
+    if (cleaned.contains('vitamin b6') || cleaned.contains('pyridoxine')) {
+      return _nutrientsByKey!.containsKey('vitamin_b6') ? 'vitamin_b6' : null;
+    }
+    if (cleaned.contains('vitamin b12') || cleaned.contains('cobalamin') || cleaned.contains('cyanocobalamin') || cleaned.contains('methylcobalamin')) {
+      return _nutrientsByKey!.containsKey('vitamin_b12') ? 'vitamin_b12' : null;
+    }
+    if (cleaned.contains('magnesium')) {
+      return _nutrientsByKey!.containsKey('magnesium') ? 'magnesium' : null;
+    }
+    if (cleaned.contains('zinc') || cleaned == 'zn') {
+      return _nutrientsByKey!.containsKey('zinc') ? 'zinc' : null;
+    }
+    if (cleaned.contains('iron') || cleaned.contains('ferrous') || cleaned.contains('ferric')) {
+      return _nutrientsByKey!.containsKey('iron') ? 'iron' : null;
+    }
+    if (cleaned.contains('creatine') || cleaned.contains('creapure') || cleaned.contains('creatine monohydrate')) {
+      return _nutrientsByKey!.containsKey('creatine') ? 'creatine' : null;
+    }
+
+    return null;
+  }
+
+  // -----------------------
+  // Internal helpers
+  // -----------------------
+
+  Future<void> _ensureNutrientsLoaded() async {
+    if (_nutrientsByKey != null) return;
+    final list = await _nutrientDataService.nutrients;
+    _nutrientsByKey = {for (final n in list) n.name: n};
+  }
+
+  Future<Nutrient?> _getNutrientByKey(String key) async {
+    await _ensureNutrientsLoaded();
+    return _nutrientsByKey![key];
+  }
+
+  // Normalize units (user input and stored ingredients)
+  // Supported return values: "mg", "ug", "g", "iu", others returned as lowercased original (e.g., "ml")
+  String _normalizeUnit(String unit) {
+    final u = unit.trim().toLowerCase();
+    if (u == 'mg') return 'mg';
+    if (u == 'g' || u == 'gram' || u == 'grams') return 'g';
+    if (u == 'µg' || u == 'μg' || u == 'mcg' || u == 'ug' || u == 'microgram' || u == 'micrograms') return 'ug';
+    if (u == 'iu') return 'iu';
+    return u; // e.g., "ml", "drops" etc. (unhandled for RDA calc)
+  }
+
+  // Extract the base unit symbol ("mg" or "ug") from the dataset unit label (e.g., "µg/day (RAE)")
+  String _unitSymbolFromLabel(String label) {
+    final lower = label.toLowerCase();
+    if (lower.startsWith('mg')) return 'mg';
+    if (lower.startsWith('g')) return 'g';
+    if (lower.startsWith('µg') || lower.startsWith('μg') || lower.startsWith('mcg')) return 'ug';
+    // Fallback: assume microgram if unknown
+    return 'ug';
+  }
+
+  // Convert an amount from one unit to another.
+  // Supported:
+  // - mg <-> ug <-> g
+  // - IU->ug for Vitamin D only (1 µg = 40 IU)
+  // Returns null if conversion cannot be performed.
+  double? _convertAmountToTargetUnit({
+    required String ingredientName,
+    required double amount,
+    required String fromUnit,
+    required String toUnit,
+  }) {
+    if (amount.isNaN || amount.isInfinite) return null;
+
+    // Handle IU conversions only for Vitamin D
+    final name = _normalizeIngredientName(ingredientName);
+    final isVitaminD = name.contains('vitamin d') || name.contains('cholecalciferol') || name.contains('ergocalciferol');
+
+    // If fromUnit equals toUnit and it's one of our supported numeric units
+    if ((fromUnit == toUnit) && (fromUnit == 'mg' || fromUnit == 'ug' || fromUnit == 'g')) {
+      return amount;
+    }
+
+    // IU -> ug for Vitamin D
+    if (fromUnit == 'iu' && isVitaminD) {
+      // 1 µg = 40 IU => ug = IU / 40
+      final ug = amount / 40.0;
+      if (toUnit == 'ug') return ug;
+      if (toUnit == 'mg') return ug / 1000.0;
+      if (toUnit == 'g') return ug / 1e6;
+      return null;
+    }
+
+    // Mass conversions
+    double? inUg;
+    if (fromUnit == 'ug') {
+      inUg = amount;
+    } else if (fromUnit == 'mg') {
+      inUg = amount * 1000.0;
+    } else if (fromUnit == 'g') {
+      inUg = amount * 1e6;
+    } else {
+      // Unsupported unit (e.g., ml, drops)
+      return null;
+    }
+
+    if (toUnit == 'ug') return inUg;
+    if (toUnit == 'mg') return inUg / 1000.0;
+    if (toUnit == 'g') return inUg / 1e6;
+
+    return null;
+  }
+
+  // Normalize an ingredient name for alias matching
+  String _normalizeIngredientName(String name) {
+    final lower = name.trim().toLowerCase();
+    // Replace common punctuation with spaces, then condense
+    final replaced = lower
+        .replaceAll(RegExp(r'[\(\)\[\]\{\},;:+/_-]+'), ' ')
+        .replaceAll(RegExp(r'\s+'), ' ')
+        .trim();
+    return replaced;
+  }
+
+  // -----------------------
+  // Life stage matching
+  // -----------------------
+
+  LifeStage? _matchLifeStageForProfile(List<LifeStage> stages, _UserProfile profile) {
+    // Exclude pregnancy/lactation when we don't track that state yet
+    final filtered = stages.where((s) {
+      final l = s.ageRange.toLowerCase();
+      return !(l.contains('pregnancy') || l.contains('lactation'));
+    }).toList();
+
+    // Try in order:
+    // 1) Exact age match + exact sex
+    final exactSexMatch = filtered.where((s) => _matchesAge(s.ageRange, profile) && _matchesSex(s.sex, profile)).toList();
+    if (exactSexMatch.isNotEmpty) return exactSexMatch.first;
+
+    // 2) Age match + sex == 'both'
+    final bothMatch = filtered.where((s) => _matchesAge(s.ageRange, profile) && s.sex.toLowerCase() == 'both').toList();
+    if (bothMatch.isNotEmpty) return bothMatch.first;
+
+    // 3) Age match ignoring sex (fallback)
+    final ageOnly = filtered.where((s) => _matchesAge(s.ageRange, profile)).toList();
+    if (ageOnly.isNotEmpty) return ageOnly.first;
+
+    // 4) If nothing matches, try 'adult-like' fallback: pick a reasonable adult range
+    final adultFallback = filtered.where((s) => s.ageRange.contains('19-30') || s.ageRange.contains('31-50')).toList();
+    if (adultFallback.isNotEmpty) return adultFallback.first;
+
+    // 5) Any entry as last resort
+    return filtered.isNotEmpty ? filtered.first : null;
+  }
+
+  bool _matchesSex(String stageSex, _UserProfile profile) {
+    final s = stageSex.toLowerCase();
+    if (s == 'both') return true;
+    if (profile.isInfant && s == 'infant') return true;
+    if (profile.sex == _Sex.male && s == 'male') return true;
+    if (profile.sex == _Sex.female && s == 'female') return true;
+
+    // For 'Other' or 'Prefer not to say', accept 'both'
+    if (profile.sex == _Sex.unknown && s == 'both') return true;
+
+    return false;
+  }
+
+  bool _matchesAge(String ageRange, _UserProfile profile) {
+    final ar = ageRange.toLowerCase().trim();
+
+    // Common shorthand: "adult" (assume >= 18 years)
+    if (ar == 'adult' || ar == 'adults') {
+      return profile.ageYears >= 18;
+    }
+
+    // Months range: e.g., "0-6 mo" or "7-12 mo"
+    final moMatch = RegExp(r'^(\d+)\s*-\s*(\d+)\s*mo$').firstMatch(ar);
+    if (moMatch != null) {
+      if (!profile.isInfant) return false;
+      final minMo = int.parse(moMatch.group(1)!);
+      final maxMo = int.parse(moMatch.group(2)!);
+      return profile.ageMonths >= minMo && profile.ageMonths <= maxMo;
+    }
+
+    // Years range: e.g., "1-3 y", "4-8 y", "9-13 y", "14-18 y", "19-30 y", "31-50 y", "51-70 y"
+    final yearRange = RegExp(r'^(\d+)\s*-\s*(\d+)\s*y$').firstMatch(ar);
+    if (yearRange != null) {
+      final minY = int.parse(yearRange.group(1)!);
+      final maxY = int.parse(yearRange.group(2)!);
+      return profile.ageYears >= minY && profile.ageYears <= maxY;
+    }
+
+    // Greater than: e.g., ">70 y"
+    final gtYear = RegExp(r'^>\s*(\d+)\s*y$').firstMatch(ar);
+    if (gtYear != null) {
+      final minExclusive = int.parse(gtYear.group(1)!);
+      return profile.ageYears > minExclusive;
+    }
+
+    // "infant" buckets handled via months range above
+    // Any unknown format: do a best-effort fallback
+    if (profile.isInfant) {
+      // If the stage mentions "infant", accept
+      if (ar.contains('infant')) return true;
+      // Else, if it starts at 0-? y, let's accept if upper bound >= 0 (rare)
+      if (ar.contains('0-') && ar.contains('y')) return true;
+      return false;
+    }
+
+    // If we are adult and stage is one of the adult ranges not following the patterns,
+    // just return false to avoid false positives.
+    return false;
+  }
+}
+
+/// Internal representation of user profile for matching
+class _UserProfile {
+  final int ageYears; // rounded down, e.g., 29
+  final int ageMonths; // total months (for infants). If >= 12, consider non-infant.
+  final _Sex sex;
+  bool get isInfant => ageYears < 1;
+
+  _UserProfile({
+    required this.ageYears,
+    required this.ageMonths,
+    required this.sex,
+  });
+
+  factory _UserProfile.from({DateTime? dateOfBirth, String? gender}) {
+    final now = DateTime.now();
+
+    int years;
+    int monthsTotal;
+    if (dateOfBirth == null) {
+      // Default to adult 30 years old when unknown
+      years = 30;
+      monthsTotal = 30 * 12;
+    } else {
+      years = now.year - dateOfBirth.year;
+      final beforeBirthday = (now.month < dateOfBirth.month) ||
+          (now.month == dateOfBirth.month && now.day < dateOfBirth.day);
+      if (beforeBirthday) years = max(0, years - 1);
+
+      // Calculate total months difference
+      int months = (now.year - dateOfBirth.year) * 12 + (now.month - dateOfBirth.month);
+      if (now.day < dateOfBirth.day) {
+        months = max(0, months - 1);
+      }
+      monthsTotal = max(0, months);
+    }
+
+    final s = _parseSex(gender);
+
+    return _UserProfile(
+      ageYears: years,
+      ageMonths: monthsTotal,
+      sex: s,
+    );
+  }
+}
+
+enum _Sex { male, female, unknown }
+
+_Sex _parseSex(String? gender) {
+  if (gender == null) return _Sex.unknown;
+  final g = gender.trim().toLowerCase();
+  if (g == 'male') return _Sex.male;
+  if (g == 'female') return _Sex.female;
+  return _Sex.unknown; // 'Other', 'Prefer not to say' -> unknown
+}

lib/widgets/info_chip.dart

@@ -0,0 +1,49 @@
+import 'package:flutter/material.dart';
+
+class InfoChip extends StatelessWidget {
+  final IconData icon;
+  final String label;
+  final BuildContext context;
+  final bool fullWidth;
+
+  const InfoChip({
+    required this.icon,
+    required this.label,
+    required this.context,
+    this.fullWidth = false,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      width: fullWidth ? double.infinity : null,
+      padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 6),
+      decoration: BoxDecoration(
+        color: Theme.of(context).colorScheme.surfaceVariant.withOpacity(0.4),
+        borderRadius: BorderRadius.circular(8),
+      ),
+      child: Row(
+        mainAxisSize: fullWidth ? MainAxisSize.max : MainAxisSize.min,
+        children: [
+          Icon(
+            icon,
+            size: 14,
+            color: Theme.of(context).colorScheme.outline,
+          ),
+          const SizedBox(width: 4),
+          Flexible(
+            child: Text(
+              label,
+              style: TextStyle(
+                fontSize: 11,
+                color: Theme.of(context).colorScheme.outline,
+                fontWeight: FontWeight.w500,
+              ),
+              overflow: TextOverflow.ellipsis,
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}

lib/widgets/supplement_card.dart

@@ -9,6 +9,7 @@ class SupplementCard extends StatefulWidget {
   final VoidCallback onEdit;
   final VoidCallback onDelete;
   final VoidCallback onArchive;
+  final VoidCallback onDuplicate;
 
   const SupplementCard({
     super.key,
@@ -17,6 +18,7 @@ class SupplementCard extends StatefulWidget {
     required this.onEdit,
     required this.onDelete,
     required this.onArchive,
+    required this.onDuplicate,
   });
 
   @override
@@ -175,7 +177,7 @@ class _SupplementCardState extends State<SupplementCard> {
                             ),
                           ),
                         ElevatedButton(
-                          onPressed: isCompletelyTaken ? null : widget.onTake,
+                          onPressed: widget.onTake,
                           style: ElevatedButton.styleFrom(
                             backgroundColor: isCompletelyTaken
                                 ? Colors.green.shade500
@@ -209,6 +211,9 @@ class _SupplementCardState extends State<SupplementCard> {
                       case 'edit':
                         widget.onEdit();
                         break;
+                      case 'duplicate':
+                        widget.onDuplicate();
+                        break;
                       case 'archive':
                         widget.onArchive();
                         break;
@@ -218,6 +223,18 @@ class _SupplementCardState extends State<SupplementCard> {
                     }
                   },
                   itemBuilder: (context) => [
+                    if (isTakenToday)
+                      PopupMenuItem(
+                        value: 'take',
+                        onTap: widget.onTake,
+                        child: const Row(
+                          children: [
+                            Icon(Icons.add_circle_outline),
+                            SizedBox(width: 8),
+                            Text('Take Again'),
+                          ],
+                        ),
+                      ),
                     const PopupMenuItem(
                       value: 'edit',
                       child: Row(
@@ -228,6 +245,16 @@ class _SupplementCardState extends State<SupplementCard> {
                         ],
                       ),
                     ),
+                    const PopupMenuItem(
+                      value: 'duplicate',
+                      child: Row(
+                        children: [
+                          Icon(Icons.copy),
+                          SizedBox(width: 8),
+                          Text('Duplicate'),
+                        ],
+                      ),
+                    ),
                     const PopupMenuItem(
                       value: 'archive',
                       child: Row(
@@ -434,7 +461,7 @@ class _SupplementCardState extends State<SupplementCard> {
                   SizedBox(
                     width: double.infinity,
                     child: ElevatedButton.icon(
-                      onPressed: isCompletelyTaken ? null : widget.onTake,
+                      onPressed: widget.onTake,
                       icon: Icon(
                         isCompletelyTaken ? Icons.check_circle : Icons.medication,
                         size: 18,

linux/flutter/generated_plugin_registrant.cc

@@ -7,9 +7,13 @@
 #include "generated_plugin_registrant.h"
 
 #include <flutter_secure_storage_linux/flutter_secure_storage_linux_plugin.h>
+#include <url_launcher_linux/url_launcher_plugin.h>
 
 void fl_register_plugins(FlPluginRegistry* registry) {
   g_autoptr(FlPluginRegistrar) flutter_secure_storage_linux_registrar =
       fl_plugin_registry_get_registrar_for_plugin(registry, "FlutterSecureStorageLinuxPlugin");
   flutter_secure_storage_linux_plugin_register_with_registrar(flutter_secure_storage_linux_registrar);
+  g_autoptr(FlPluginRegistrar) url_launcher_linux_registrar =
+      fl_plugin_registry_get_registrar_for_plugin(registry, "UrlLauncherPlugin");
+  url_launcher_plugin_register_with_registrar(url_launcher_linux_registrar);
 }

linux/flutter/generated_plugins.cmake

@@ -4,6 +4,7 @@
 
 list(APPEND FLUTTER_PLUGIN_LIST
   flutter_secure_storage_linux
+  url_launcher_linux
 )
 
 list(APPEND FLUTTER_FFI_PLUGIN_LIST

macos/Flutter/GeneratedPluginRegistrant.swift

@@ -11,6 +11,7 @@ import flutter_secure_storage_darwin
 import path_provider_foundation
 import shared_preferences_foundation
 import sqflite_darwin
+import url_launcher_macos
 
 func RegisterGeneratedPlugins(registry: FlutterPluginRegistry) {
   ConnectivityPlusPlugin.register(with: registry.registrar(forPlugin: "ConnectivityPlusPlugin"))
@@ -19,4 +20,5 @@ func RegisterGeneratedPlugins(registry: FlutterPluginRegistry) {
   PathProviderPlugin.register(with: registry.registrar(forPlugin: "PathProviderPlugin"))
   SharedPreferencesPlugin.register(with: registry.registrar(forPlugin: "SharedPreferencesPlugin"))
   SqflitePlugin.register(with: registry.registrar(forPlugin: "SqflitePlugin"))
+  UrlLauncherPlugin.register(with: registry.registrar(forPlugin: "UrlLauncherPlugin"))
 }

pubspec.lock

@@ -638,6 +638,70 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.4.0"
+  url_launcher:
+    dependency: "direct main"
+    description:
+      name: url_launcher
+      sha256: f6a7e5c4835bb4e3026a04793a4199ca2d14c739ec378fdfe23fc8075d0439f8
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.3.2"
+  url_launcher_android:
+    dependency: transitive
+    description:
+      name: url_launcher_android
+      sha256: "69ee86740f2847b9a4ba6cffa74ed12ce500bbe2b07f3dc1e643439da60637b7"
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.3.18"
+  url_launcher_ios:
+    dependency: transitive
+    description:
+      name: url_launcher_ios
+      sha256: d80b3f567a617cb923546034cc94bfe44eb15f989fe670b37f26abdb9d939cb7
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.3.4"
+  url_launcher_linux:
+    dependency: transitive
+    description:
+      name: url_launcher_linux
+      sha256: "4e9ba368772369e3e08f231d2301b4ef72b9ff87c31192ef471b380ef29a4935"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.2.1"
+  url_launcher_macos:
+    dependency: transitive
+    description:
+      name: url_launcher_macos
+      sha256: c043a77d6600ac9c38300567f33ef12b0ef4f4783a2c1f00231d2b1941fea13f
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.2.3"
+  url_launcher_platform_interface:
+    dependency: transitive
+    description:
+      name: url_launcher_platform_interface
+      sha256: "552f8a1e663569be95a8190206a38187b531910283c3e982193e4f2733f01029"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.3.2"
+  url_launcher_web:
+    dependency: transitive
+    description:
+      name: url_launcher_web
+      sha256: "4bd2b7b4dc4d4d0b94e5babfffbca8eac1a126c7f3d6ecbc1a11013faa3abba2"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.4.1"
+  url_launcher_windows:
+    dependency: transitive
+    description:
+      name: url_launcher_windows
+      sha256: "3284b6d2ac454cf34f114e1d3319866fdd1e19cdc329999057e44ffe936cfa77"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.1.4"
   uuid:
     dependency: "direct main"
     description:

pubspec.yaml

@@ -1,7 +1,7 @@
 name: supplements
 description: "A supplement tracking app for managing your daily supplements"
 publish_to: "none"
-version: 1.0.3+27082025
+version: 1.0.6+28082025
 
 environment:
   sdk: ^3.9.0
@@ -35,6 +35,7 @@ dependencies:
   flutter_secure_storage: ^10.0.0-beta.4
   uuid: ^4.5.1
   crypto: ^3.0.6
+  url_launcher: ^6.3.2
 
 dev_dependencies:
   flutter_test:
@@ -52,3 +53,6 @@ dependency_overrides:
 
 flutter:
   uses-material-design: true
+
+  assets:
+    - assets/canada_health.json

test/widget_test.dart

@@ -1,30 +0,0 @@
-// This is a basic Flutter widget test.
-//
-// To perform an interaction with a widget in your test, use the WidgetTester
-// utility in the flutter_test package. For example, you can send tap and scroll
-// gestures. You can also use WidgetTester to find child widgets in the widget
-// tree, read text, and verify that the values of widget properties are correct.
-
-import 'package:flutter/material.dart';
-import 'package:flutter_test/flutter_test.dart';
-
-import 'package:supplements/main.dart';
-
-void main() {
-  testWidgets('Counter increments smoke test', (WidgetTester tester) async {
-    // Build our app and trigger a frame.
-    await tester.pumpWidget(const MyApp());
-
-    // Verify that our counter starts at 0.
-    expect(find.text('0'), findsOneWidget);
-    expect(find.text('1'), findsNothing);
-
-    // Tap the '+' icon and trigger a frame.
-    await tester.tap(find.byIcon(Icons.add));
-    await tester.pump();
-
-    // Verify that our counter has incremented.
-    expect(find.text('0'), findsNothing);
-    expect(find.text('1'), findsOneWidget);
-  });
-}

windows/flutter/generated_plugin_registrant.cc

@@ -8,10 +8,13 @@
 
 #include <connectivity_plus/connectivity_plus_windows_plugin.h>
 #include <flutter_secure_storage_windows/flutter_secure_storage_windows_plugin.h>
+#include <url_launcher_windows/url_launcher_windows.h>
 
 void RegisterPlugins(flutter::PluginRegistry* registry) {
   ConnectivityPlusWindowsPluginRegisterWithRegistrar(
       registry->GetRegistrarForPlugin("ConnectivityPlusWindowsPlugin"));
   FlutterSecureStorageWindowsPluginRegisterWithRegistrar(
       registry->GetRegistrarForPlugin("FlutterSecureStorageWindowsPlugin"));
+  UrlLauncherWindowsRegisterWithRegistrar(
+      registry->GetRegistrarForPlugin("UrlLauncherWindows"));
 }

windows/flutter/generated_plugins.cmake

@@ -5,6 +5,7 @@
 list(APPEND FLUTTER_PLUGIN_LIST
   connectivity_plus
   flutter_secure_storage_windows
+  url_launcher_windows
 )
 
 list(APPEND FLUTTER_FFI_PLUGIN_LIST