Function Health

Function Health is the right choice for health-conscious individuals who want comprehensive biomarker data beyond what standard annual physicals provide and are willing to pay $365 per year for that depth. The ApoB, Lp(a), and advanced cardiovascular markers that most general practitioners will not order without symptoms are the primary reason people choose Function over standard lab testing. The AI chat feature for interpreting results in plain language adds genuine value for members who want to understand their data without scheduling a separate consultation.

The honest limitation is that Function Health is a data service, not a medical care provider. Results require interpretation by a qualified healthcare professional for any clinical decisions, and the platform explicitly positions itself as supplementary to existing care rather than a replacement. For individuals who mainly want a basic annual checkup covered by insurance, Function Health is not the right fit. For those who want to track 100 plus biomarkers proactively and have the context to use that data meaningfully, it offers depth that no standard lab panel matches at the price point.

Function Health is a membership-based preventive health testing service that provides access to over 100 blood biomarker tests per year, covering areas most standard annual physicals skip including ApoB, Lp(a) cardiovascular markers, comprehensive hormones, advanced thyroid panels, heavy metals, and nutrient levels. Founded by Mark Hyman, who started the Cleveland Clinic's Functional Medicine program, the service is built around the idea that comprehensive lab data should be accessible without requiring individual test orders from a physician.

The membership costs $365 per year, which covers over 100 biomarkers tested twice annually, with approximately 60 re-tested mid-year. In November 2025, Function launched its Medical Intelligence Lab, a doctor-trained AI built on members' lab data, imaging, wearables, and medical records, with a member-facing Private AI Chat and Protocols feature. In early 2026, it added a ChatGPT app integration and AI connectors to Microsoft Copilot Health and Perplexity Health, allowing members to pull their lab results into external AI tools for analysis and questions.

Function raised a $298 million Series B in late 2025. The service operates in the United States and is not a replacement for primary care or medical advice, but positions itself as a data layer that members bring to their existing healthcare providers.