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Does Apple Health Share Your Period Data?

Apple Health stores cycle data on-device and doesn't sell it under its policies. But third-party apps with Apple Health read access can transmit your data to

Apple's privacy reputation is largely deserved — for first party data. The complexity with period data is that it often passes through third party apps that use Apple Health as a data conduit, and Apple's policies govern Apple's data, not theirs. What Apple Does With Your Data Apple's Health app on iOS stores menstrual cycle data locally on your device. Apple does not: Sell health data to advertisers Use health data to profile you for advertising Share health data with third parties without your explicit permission The Apple Privacy Policy and the specific HealthKit developer guidelines prohibit using health data for advertising or selling it to data brokers. These are contractual commitments Apple enforces on app developers — violating them can result in removal from the App Store. iCloud Health Sync: If you back up your iPhone to iCloud and Health data is included in the backup, your cycle data is stored in iCloud. Apple uses end to end encryption for Health app data, meaning the decryption keys are derived from your device passcode and are not held by Apple. In practice, this means Apple cannot produce your Health data in response to a subpoena — there's nothing for them to hand