It depends on what you're trying to figure out. Function Health is a general-longevity membership with 100+ biomarkers, ongoing tracking, and a broad longevity focus. JenSkin is a one-time nine-biomarker panel focused specifically on skin aging in women. They are different products for different goals.
What Function Health is good at. It's the best product on the market if you want a broad longevity dashboard. 100+ markers covering cardiovascular, metabolic, hormonal, thyroid, iron, and organ function. Ongoing tracking through their app. Membership-based, roughly $500/year plus retest costs. Optimized for people who want to run their body like a dashboard — biohackers, longevity enthusiasts, quantified-self people. The clinical review layer is real and the marker list is comprehensive.
What Function Health is not built for. It's not built to answer the question what is driving how my skin is aging. Nine of Function's markers overlap with the JenSkin panel, but the reference ranges used are clinical (built to detect disease), not skin-longevity-optimized. And the output is a dashboard of numbers, not a personalized report that translates those numbers into skin-specific narrative.
What JenSkin is built for. Nine biomarkers specifically selected for peer-reviewed connection to skin aging in women. Reference ranges tighter than clinical normal, built from the dermatology literature. A personalized plain-English report explaining what your specific pattern means for your skin. A walkthrough call with a real member of our research team. One-time $299 — not a membership. Retest at member pricing when you want to see whether your interventions are moving the numbers.
Which one is worth it? If you want comprehensive longevity tracking, Function is a good product. If you want to know exactly what is driving how your skin ages and what to do about it, JenSkin is built for that. They can also be complementary — some of our customers run Function once a year for general longevity and JenSkin twice a year for the skin lens.