Function Health.

What Function actually is

A consumer-priced lab-testing membership, headquartered in the US, with Mark Hyman as Chief Medical Officer. The proposition is the price floor: $365 a year (more in New York and New Jersey) for an annual 100+ marker blood panel plus a 60+ marker follow-up panel three to six months later, with clinician-reviewed results and a usable dashboard wrapping it.

Function is not a clinic in the sense the rest of this directory is. Whole-body MRI and CT exist only as paid add-ons through its Ezra unit, there is no CPET-grade VO₂ max and no ongoing in-person physician relationship, and the ‘personalised protocol’ feature is still in beta. The product is the bloodwork plus the interpretation layer.

What it does well

Three things, on their own terms.

Price disruption. The $365/year price point is a structural shift in what comprehensive biomarker access costs. The same bloodwork, ordered at-cost in a US executive-medicine setting, runs into four-figure territory. Function has decoupled the lab work from the clinical relationship and priced accordingly.

Conflict structure. No treatment products. No in-house pharmacy. Its supplement-guidance unit, SuppCo, states it does not profit from supplement sales. The financial geometry is the membership plus optional add-on testing. This is structurally cleaner than every clinical practice in this directory except Prenuvo.

The dashboard. Reference-range comparisons, longitudinal tracking across panels, and short explanatory copy on each marker make the product usable for a numerate motivated reader who knows what they are looking at.

What it is not

Function is not a substitute for clinician-led longevity care.

Clinicians review every result and write a summary, but there is no physician relationship translating it into a personal protocol over the year. A written summary is not a consultation; the difference matters most where it matters most — for a borderline finding that could mean three different things depending on context.

Imaging is an add-on, not part of the membership. Whole-body MRI and CT can be booked through Ezra at extra cost; without them, the highest-yield findings in the longevity workup are out of scope.

There is no functional testing. CPET, DEXA, body composition, sleep architecture — all absent.

For the reader who genuinely wants a longevity workup, Function is a component, at best — useful as the bloodwork layer beside an imaging service like Prenuvo and a clinical relationship at the upper tier. As a standalone product, it is half a workup.

Where the evidence question lives

Less in unproven therapies — there are none — and more in marker selection and reference-range methodology. Some markers in the panel have well-established clinical actionability (lipids, HbA1c, ApoB if included, hsCRP). Others are included for completeness with weaker evidence on what optimal really means in an asymptomatic adult. The dashboard is generally honest about this distinction.

The verdict

For the budget-conscious motivated reader who wants annual bloodwork at a price the category had not previously accepted, Function is a real option. For the reader looking for a longevity clinic in any of the senses the rest of this directory uses the word, Function is a complement, not a substitute.

A diagnostic without a clinician is a different product to a diagnostic with one. Function is the first; the rest of this directory is mostly the second.

Questions readers ask about Function Health

— 01

How much does Function Health cost?

Pricing for Function Health, as checked in September 2026: Annual membership at $365 per year.

— 02

Does Function Health earn from the treatments it recommends?

No. In our assessment there is no structural conflict of interest. Lab-testing membership. Function does not sell treatments to its members; its terms state it offers no medical treatment. Add-on imaging (MRI, CT via its Ezra unit) and supplement guidance (SuppCo, which does not profit from supplement sales) sit alongside the membership. Function Health scores 22/25 on conflict freedom.

— 03

Is Function Health physician-led?

Not in the clinical sense our rubric requires. Medical leadership: Dr. Mark Hyman (Chief Medical Officer). Function Health scores 16/25 on medical supervision.

— 04

How does Function Health rank among longevity clinics?

Function Health ranks #15 of 19 in the 2026 Longevity Clinics ranking, with 72/100 (Good, with caveats). An effective price-disruptor for biomarker access. Not a substitute for clinician-led longevity care.