If reThrive isn't seeing your data from Apple Health, there are a few common causes. This guide will help you diagnose and fix sync issues.
Quick fixes
Try these steps first:
1. Force a manual sync
Open reThrive
Tap Settings (top left)
Tap Apple Health
Tap Sync now
Wait 10-15 seconds
Return to Home and check if data appears
2. Check Apple Health permissions
Open Apple Health
Tap your profile picture (top right)
Tap Apps under Privacy
Select reThrive
Make sure all relevant data types are toggled on
3. Restart both apps
Force quit both reThrive and Apple Health
Open Apple Health first and let it load
Open reThrive and trigger a sync
Common sync problems
reThrive reports missing data for all biomarkers
This could mean your device data is not integrated with Apple Health, or that reThrive permissions aren't granted.
Fix:
Open Apple Health and verify that you have enough readings available each week for:
4x Resting Heart Rate,
4x Heart Rate Variability,
1x Cardio Fitness (VO2 max) and
1x Lean Body Mass (or Weight and Body Fat %)
If there is no or not enough data, connect sources or add readings manually
Still in Apple Health navigate to Profile > Apps > reThrive
Grant read permissions for:
Resting Heart Rate
Heart Rate Variability
Cardio Fitness (VO2max)
Lean Body Mass, or Weight + Body Fat Percentage
Height
Return to reThrive and trigger a sync from Settings > Apple Health
Data appears in Apple Health but not in reThrive
Your wearable is syncing to Apple Health correctly, but reThrive isn't reading it.
Fix:
Check that permissions are granted (see above)
Make sure the data is recent (within the past week) and with enough readings (see above)
Force a manual sync in reThrive
If still not working, try disconnecting and reconnecting Apple Health:
Settings > Apple Health > Disconnect
Restart reThrive
Settings > Apple Health > Connect
Some biomarkers sync but others don't
Different devices provide different metrics through Apple Health.
Check device compatibility:
See the compatibility table in Apple Health
Only Apple Watch provides HRV through Apple Health (with some exceptions)
Body composition requires a smart scale or manual entry of Lean Body Mass or Weight and Body Fat %
If you have the right device but data is still missing:
Open the device's companion app
Check that Apple Health sync is enabled
Force the device to sync (open the app and wait)
Check Apple Health to confirm the data is there
Trigger a reThrive sync
Sync worked before but stopped
Something changed with permissions or device settings.
Fix:
Check if you updated iOS or the reThrive app recently
Re-grant permissions in Apple Health (iOS updates can reset them)
Check if your wearable's companion app needs an update
Make sure Low Power Mode isn't preventing background syncs
Try re-synchronizing Apple Health in reThrive
Advanced troubleshooting
Check what data Apple Health actually has
Before troubleshooting reThrive, verify Apple Health has the data:
Open Apple Health
Tap Browse
Select a category (e.g., Heart)
Choose a metric (e.g., Resting Heart Rate)
Look at the chart and data points
If Apple Health doesn't have the data, the problem is with your wearable's sync, not reThrive.
Check data source priority in Apple Health
If multiple devices write the same metric, Apple Health prioritizes one source:
Open Apple Health
Tap Browse
Select a metric
Scroll to Data Sources & Access
Check the priority order
Make sure your preferred device is at the top. Drag to reorder if needed.
Clear Apple Health cache
In rare cases, Apple Health's cache can cause issues:
Go to iPhone Settings > Health
Toggle Sync Health Data off
Wait 10 seconds
Toggle it back on
Open reThrive and trigger a sync
When to contact support
If none of these steps work, reach out to support with:
What biomarkers are missing
What device you're using to track them
Screenshots of your Apple Health permissions for reThrive
Screenshots of the data in Apple Health showing it exists