Function Health Review: Price, Tests, Folate and B12 Coverage, and Alternatives

Function Health is a yearly lab-testing membership. As of October 2026 it lists a price of $365 per year, and it says that covers 160+ lab tests drawn at Quest locations (or at home) across two visits a year, with clinician notes and an app to track results.¹² This researched overview explains how it works, what is and is not included (including folate and vitamin B12), whether the company is legitimate, what to weigh before broad screening, and how it compares with Superpower, SiPhox, and InsideTracker. We have not used Function ourselves; every product fact below comes from Function's own pages, checked on October 2, 2026.

Quick answer: who Function suits, and who should skip it

Function may suit an adult who wants a large, recurring set of lab tests in one place, likes tracking numbers over time, lives near a Quest location in a covered state, and plans to share results with a regular clinician. Function itself says it is not a replacement for your health benefits or your doctor.²

It is a poor fit for some people:

• Anyone who is pregnant. Function's FAQ says membership is not available during pregnancy.²
• People under 18. Membership is for adults 18 and older.²
• People in Rhode Island, Hawaii, or Puerto Rico. Function says it is not yet offered there.²
• Anyone who mainly wants folate and vitamin B12 checked. Those were not on Function's included list when we looked (details below).³
• People who already have symptoms. New symptoms need a clinician visit, not a wellness panel. Lab results only make sense alongside your history and an exam.⁴

What Function Health is and how it works

According to Function, the process has three steps: test, get results explained, and follow a plan, then test again.⁵

1. Join and schedule. After signing up, members book a lab visit at one of 2,000+ Quest locations through Function's site.² Function also says you can have a licensed specialist draw blood at your home or office.¹ We could not find the price of the at-home option on the pages we checked.
2. Prepare. Function asks members to fast for 8 hours, test in the morning, and avoid seafood for 48 hours before heavy-metal tests. It says not to stop medicines without talking to your doctor.²
3. Get your blood drawn. Function says a lab visit takes about 15 minutes and draws about 35 to 85 mL of blood.² Members with an active menstrual cycle, and members in Arizona, may need two visits for the annual test.²
4. Get results. Function says the first results usually start arriving within 48 hours. Each result comes with explanations, action items, and a clinician's summary, and a provider will call if a result is critical.²
5. Retest. Function describes an annual test of 100+ markers followed by a mid-year test of 60+ markers 3 to 6 months later. The mid-year test must be used before renewal and does not roll over.²

Members can download results as a PDF for their own doctor, upload outside lab results, connect wearables, and connect results to AI tools such as ChatGPT, Claude, or Perplexity.²

What's included

Function's "What we test" page groups its included tests by body system. The table below lists examples Function shows as included in membership, and examples it lists as paid add-ons.³

Function says some markers are tested twice a year and others once, and that you can order any biomarker on demand for an extra member-only cost.³² It says imaging is not included in membership but is offered at member pricing, with MRI scans starting at $899 on its "What we test" page.³²

Folate, vitamin B12, and MTHFR: what Function covers

This is the part most relevant to our readers, and it is easy to miss.

• Folate: not listed among Function's included tests on the pages we checked.³⁶
• Serum vitamin B12: not listed as included. Function includes methylmalonic acid (MMA), which it labels a "B12 proxy," and homocysteine.⁶
• Add-ons: Function lists an "Extended Vitamins, Minerals, Nutrients" add-on and an "MTHFR Gene" add-on. We could not confirm which markers the extended add-on contains, so ask Function before buying if folate or B12 is your reason for testing.⁶

Why it matters: homocysteine can rise with folate deficiency, but it is nonspecific, because B12 deficiency, kidney problems, and other factors also raise it.⁷⁸ A clinician usually reads folate testing alongside a complete blood count, vitamin B12, diet, alcohol use, medicines, and history.⁹¹⁰ If your goal is to check folate and B12 specifically, a targeted test may be simpler. Our guides to the folate blood test and folic acid and vitamin B12 explain what those results mean.

If you add the MTHFR gene test, keep the CDC's position in mind: people with common MTHFR variants can process folic acid and should not avoid it on that basis.¹¹ Our page on folic acid and MTHFR covers this in detail.

Pricing as listed (October 2026)

Prices change. Confirm the current price and your state's terms at checkout.

Pros and cons

These come from Function's published information, not from our own use.

Is Function Health legit?

Here are the facts we could verify on Function's own site:

• Company: Function says it was founded in the U.S. and is based in Austin, Texas.² Its homepage names Mark Hyman, M.D., as co-founder and chief medical officer.⁵
• Lab partner: Function says it partners with Quest for blood draws at 2,000+ U.S. locations.²
• Clinician review: Function says clinicians review every result and flag issues, and a healthcare provider will call you if a result is critical.¹²
• Data: Function says it is SOC 2 Type II verified and HIPAA-aligned. It says only you, its lab partners, clinicians, and essential administrators can access results, and that results may be shared with state health authorities when the law requires it. You can delete your data, and deletion is permanent.²
• Marketing use of data: Function says it asks for your permission before using your health data for marketing.²

What we could not verify: we did not find independent evidence on whether Function members have better health outcomes. Function's homepage describes its tests as detecting "1000+ conditions"; that is the company's claim, and a lab marker that is out of range is not the same as a diagnosis.⁵⁴

What to consider before broad biomarker screening

Testing healthy people for many things at once has tradeoffs that are worth knowing before you pay.

• Out-of-range results are common in healthy people. MedlinePlus explains that reference ranges come from groups of healthy people, that it is common for healthy people to sometimes fall outside a range, and that a normal result is not a guarantee of good health.⁴ The more tests you run, the more chances for a flag that needs follow-up.
• Evidence on general health checks is not encouraging. A Cochrane review of randomized trials (15 trials reporting results, about 252,000 adults) found that offering general health checks had little or no effect on deaths from any cause or from cancer, and probably little or no effect on cardiovascular deaths. The authors note that screening increases diagnostic tests and treatments, which can harm as well as help.¹² Those trials studied traditional health checks, not Function specifically.
• Lab differences matter for trends. MedlinePlus advises using the same lab when tracking results over time, because methods and ranges differ between labs.⁴

None of this means testing is wrong for you. It means a plan to review results with a clinician matters more than the number of markers.

Function Health alternatives

If Function does not fit, here are the main options we cover, with the facts each company publishes.

For a direct comparison of the two big memberships, see Superpower vs Function Health. If you want a few specific markers rather than a membership, our at-home blood test guide and Everlywell review cover single kits and lab orders.

Function Health vs InsideTracker

InsideTracker is an older biomarker platform that pairs blood tests with nutrition and lifestyle recommendations. Here is what each company lists:

InsideTracker tells customers not to take supplements within 24 hours of the blood draw.¹⁸ That is relevant for folate, because serum folate reflects recent intake.⁷⁸ We did not verify whether folate or B12 is in InsideTracker's Ultimate panel.

Questions to ask your clinician

Bring these to your regular doctor, nurse practitioner, or pharmacist before or after joining:

• Given my age, history, and medicines, which of these tests would you actually act on?
• If something comes back out of range, will you review it, and what follow-up would you order?
• Do I need folate and vitamin B12 checked, and should that include a complete blood count?⁹¹⁰
• Should I pause any supplements before testing, or just tell you what I took?⁷
• Am I due for any recommended screening that a blood panel does not replace?

This article is for general education and is not medical advice. Doses and needs differ from person to person, so talk with your clinician or pharmacist about your situation. Read our editorial policy and medical disclaimer.