Function Health Review 2026: Is the $365 Membership Worth It?

The cardiovascular set is the strongest part of the offering and the reason to consider it at all. ApoB, Lp(a), hs-CRP and homocysteine are the four markers that separate a modern risk assessment from a 1990s cholesterol panel, and most primary care visits still do not include any of them. Lp(a) in particular is measured once in a lifetime, is almost entirely genetic, and materially changes how aggressively you should treat everything else. Getting it as part of a bundle you were buying anyway is a genuine advantage.

Metabolic coverage includes fasting glucose, fasting insulin, HbA1c and a full lipid panel. Fasting insulin is the marker that moves years before glucose does, and its omission from standard care is the single most common reason people discover insulin resistance late. Hormones cover total and free testosterone, SHBG, estradiol, DHEA-S and cortisol, with a full thyroid panel including free T3, free T4 and antibodies rather than TSH alone.

The remainder covers nutrients (vitamin D, B12, folate, ferritin, magnesium), kidney and liver function, autoimmunity screening, and a heavy metals and environmental toxins panel. The toxins panel is the part with the weakest decision value — an elevated result rarely leads anywhere actionable, and the reference ranges for chronic low-level exposure are contested.

You order online, book a draw at a partner patient service center, and results populate a dashboard over one to two weeks. Every result is reviewed by a clinician, who flags anything outside range and writes a short interpretation. A second draw is included later in the year, and you can add individual tests on demand between draws for an extra fee. Imaging — MRI and CT — is available as a paid add-on in some markets.

The dashboard is genuinely good at showing change over time, which is the part most people underestimate. A single ApoB of 95 mg/dL means less than three consecutive readings showing 82, 95, 110. Function's structural advantage is not the breadth of any one draw; it is that the same markers get retested on the same assays year after year, which makes the trend line trustworthy.

Function does not prescribe. If your total testosterone comes back at 280 ng/dL with symptoms, the membership has done its job and you still need a clinician elsewhere — which means paying twice. The same applies to a high ApoB that warrants a statin, or a TSH that warrants thyroid treatment. Treat the membership as diagnostics, not care.

The clinician insights are pattern-matched summaries rather than a treatment plan. They are accurate and appropriately cautious, but a note saying your homocysteine is mildly elevated and B-vitamin status is worth reviewing is not the same as a physician who knows your history deciding what to do about it.

Two draws a year is too infrequent for anyone titrating a hormone or metabolic protocol. If you start TRT or a GLP-1, you need labs at six to eight weeks and then quarterly — a cadence Function's schedule does not cover, so you will be buying interim draws elsewhere regardless.

Buying the same core set à la carte at a reference lab — ApoB, Lp(a), hs-CRP, homocysteine, fasting insulin, HbA1c, lipids, full thyroid, testosterone with SHBG, CBC and CMP — typically lands somewhere in the $350 to $600 range at list price, less on promotion. So the membership is roughly at parity on the markers you would actually order, and far cheaper on the 100+ you would not.

That reframes the decision. You are not paying for value per marker; you are paying to skip the work of deciding what to order and to get an infrastructure that keeps testing the same things every year. For someone who has never assembled a panel before, that is worth real money. For someone who already knows their ten markers, it is not.