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Quick answer: The short version of this Function Health review: it is a legitimate, clinically thorough lab membership. For $365 per year you get 160+ biomarkers, two blood draws plus a urinalysis, and a 6-month retest. That breadth is its real strength. The catch is price and pace. If you mainly want one comprehensive annual baseline plus plain-language scores and an AI you can actually talk to, Superpower covers the same screening job at $199 per year, which is why it is the alternative we tell most readers to price out before they commit to Function.
Disclosure: Vital Signs Today may earn a commission if you buy through links on this page, at no extra cost to you. This does not influence our evidence-based assessments. We are not a medical provider; talk to a clinician before acting on test results.
One caveat before the numbers: this is an editorial review, not medical advice. Direct-to-consumer panels like Function Health screen and track your blood chemistry. They do not diagnose or treat. Any out-of-range result is a reason to talk to a licensed clinician, not a verdict on your health.
| Service | Best for | Pricing | Visit |
|---|---|---|---|
| Function Health | Annual deep panel | Annual membership | View › |
| Superpower | Whole-body optimization | ~$179/yr membership | View › |
What Function Health actually is
Function Health is a direct-to-consumer lab membership built around scale: roughly 160+ biomarkers in a single membership year, structured into two draws rather than one. You pay an annual fee, go to a partner draw site, and get your numbers back in a dashboard that flags what is out of range.
The product’s identity is breadth and cadence. You are not buying a one-off panel, you are buying a year of structured testing with a built-in retest so you can see whether a flagged marker moved. For people who treat bloodwork as an ongoing project, that framing lands.
In plain terms: this is a screening and tracking service, not a clinic. It is a fast, organized way to see a very wide slice of your blood chemistry once or twice a year. It is not a substitute for a doctor who manages a condition, and the company is upfront that its results are meant to inform conversations with your provider rather than replace them.
What the 160+ markers actually cover
The number sounds abstract until you see what it buys. The panel spans the major categories a thorough physician would want if cost were no object: a full metabolic and lipid workup (glucose, HbA1c, fasting insulin, a complete cholesterol breakdown including ApoB where offered), cardiovascular and inflammation markers like hs-CRP and homocysteine, a broad hormone panel (thyroid with TSH and free T3 and T4, plus sex and stress hormones), organ function for liver and kidney, a complete blood count, and a wide nutrient screen covering vitamin D, B12, folate, ferritin, and magnesium. The urinalysis adds a kidney and metabolic layer most home kits skip entirely.
That is the honest case for breadth. A standard insurance-covered annual physical often runs a basic metabolic panel, a lipid panel, and a CBC, maybe twenty to thirty markers if you are lucky. Function is testing five to eight times that. The value is not that every one of the 160 will change your life. It is that the two or three that quietly matter for you, a creeping ApoB, a low ferritin, a thyroid drifting out of range, are far more likely to be caught when the net is this wide.
What you actually get for $365 a year
The simplest way to actually get this done
Superpower is a full-body lab membership that runs 100+ biomarkers, has each result reviewed by a doctor, and tracks your numbers year over year (about $199/year). It is what we point readers to when they would rather get one clean, complete draw than chase single tests one at a time. Here is superpower reviewed in full.
Here is the honest ledger. For $365 per year, Function Health gives you 160+ biomarkers, two blood draws across the year, a urinalysis, and a 6-month retest so you can confirm whether an early flag is trending the right way. That retest is the part competitors often skip, and it is genuinely useful if a marker came back borderline.
The marker count is the headline, and it is a fair one. You are getting a wider net than a typical doctor’s annual panel, covering metabolic, cardiovascular, hormonal, organ, nutrient, and inflammation markers in one membership. If your goal is to leave almost no common blood marker untested in a year, Function is built for exactly that.
Worth naming the practical mechanics, because they shape the experience. You book each draw at a partner lab location, fast beforehand the way you would for any standard panel, and results populate the dashboard over the following days. The second draw, scheduled around the 6-month mark, is what turns a snapshot into a trend line. That cadence is the structural difference between Function and a one-and-done annual test, and it is the thing you are really paying the premium for.
The tradeoffs are equally honest. It is the pricier option in this comparison, the two-draw structure means more trips to a draw site, and its AI chat layer is newer than what some rivals now lead with. None of that makes it a bad product. It makes it a thorough, premium one aimed at a specific kind of buyer.
What affects your results, and how to not waste a draw
A wide panel is only as good as the prep behind it, and this is where people quietly sabotage their own numbers. Fasting matters most: glucose, insulin, and a full lipid panel need an 8 to 12 hour fast, so a coffee with cream or an early breakfast can push your triglycerides and glucose into a flag that is not real. Time of day moves hormones, especially cortisol and testosterone, which run highest in the morning, so an afternoon draw can read low for reasons that have nothing to do with your health.
A few more that trip people up. A hard workout in the 24 to 48 hours before a draw can elevate creatine kinase, liver enzymes (AST and ALT), and even mildly nudge kidney markers, because muscle breakdown shows up in the blood. Dehydration concentrates the sample and can inflate hemoglobin, hematocrit, and creatinine. Certain supplements distort specific markers: high-dose biotin can interfere with thyroid and hormone immunoassays, and a recent iron supplement can spike ferritin. The fix is simple. Fast when told, book a morning slot, hydrate well, skip the pre-test gym session, and pause biotin for a few days beforehand. Do that and you strip out most of the false alarms before they ever appear on the dashboard.
Is Function Health legit? What the reviews actually say
Yes. The biomarker counts are real, the testing runs through standard partner labs, and the membership delivers what it advertises. When people search whether it is legit, they are usually reacting to the price tag and the sheer volume of markers, not to any sign of a scam. Themes users commonly report in Function Health reviews are positive on data depth and on the dashboard’s ability to organize a large number of results without overwhelming you.
The fair criticisms users commonly raise are about interpretation and pace: 160+ numbers is a lot to make sense of, and not everyone wants two draws a year. Those are product-fit issues, not legitimacy issues. If breadth is your priority and the price fits, Function Health is a credible choice.
One safety note that applies to any direct-to-consumer panel: a flagged or out-of-range result is a prompt to talk to a clinician, not a diagnosis. These services screen and track. They do not treat. If a number looks alarming, the right next move is a conversation with a licensed provider who can put it in the context of your history, not a self-directed change based on a dashboard color.
Why “too many flags” is not a legitimacy problem
A recurring worry in reviews is that a first panel comes back with a handful of yellow flags, which reads like something is wrong. Usually it is not. Standard lab reference ranges are built to capture the middle 95% of a healthy population, so roughly 1 in 20 healthy people fall outside the range on any single marker purely by chance. Test 160 markers and a handful of harmless flags is the statistically expected result, not evidence of disease or of a service overselling problems to upsell you. The 6-month retest exists precisely for this: it lets you see whether a borderline marker is actually trending the wrong way or just wobbling inside normal biological variation.
Our Function Health review verdict: where it shines, where it strains
Best for: the maximalist tracker
If you want the widest reasonable net and you will actually use a 6-month retest to chase down a borderline marker, Function is arguably the most thorough consumer option in this set. The two-draw cadence and the extra urinalysis give it a more clinical feel than a single annual snapshot. For someone who is mid-protocol, dialing in a supplement stack, or watching a marker their doctor flagged last year, that built-in second look has real value.
Strains for: the once-a-year baseliner
If what you really want is one solid annual baseline, clear scores, and a nudge on what to do next, you are paying for capacity you may not use. Two draws a year is a feature for some people and friction for others. And at $365, the per-year cost is the highest in this comparison, which matters if you plan to test for several years running. Multiply that gap across three or four years and the premium stops being a rounding error.
This is the exact decision point where it pays to compare before you commit.
Function Health vs Superpower: the comparison worth running
This is the matchup most readers are weighing, so let us be specific rather than diplomatic. The two services do the same core job, full-body blood screening you manage yourself, but they optimize for different buyers.
On breadth and cadence
Function wins on raw breadth and structure: 160+ biomarkers, two draws, a urinalysis, and a 6-month retest. If you want maximum coverage and a built-in mid-year check, that is a real edge, and it is the strongest argument in Function’s favor.
On price and simplicity
Superpower wins on cost and on getting to the point. Its membership is $199 per year for one comprehensive annual blood draw covering 100+ biomarkers, about 150 once you count calculated ratios. It then layers on 17 plain-language health scores, a personalized action plan, and an AI concierge you can chat with about your results. (Note: Superpower is $399 in New York and New Jersey because of state lab rules, so factor your state in.)
On making sense of the results
This is where the two philosophies diverge most. Function hands you a very wide spread of numbers and trusts you, or your doctor, to interpret them. Superpower compresses its panel into 17 scores and an action plan, then puts an AI concierge on top so you can ask what a result means in plain language. Neither approach is wrong. One rewards people who enjoy the raw data; the other rewards people who want a verdict. Knowing which camp you are in tells you most of what you need to decide.
The practical read: if you are the kind of person who will use two draws and a retest to dig into borderline markers, Function’s depth earns its higher price. If you mainly want one strong yearly baseline, clear scores instead of a wall of numbers, and an AI that explains what your results mean, Superpower delivers that screening job for $166 less per year. For most readers landing on a Function Health review, that second profile is the common one, which is why Superpower is our recommended alternative to price out first.
Both are screening-and-tracking services rather than diagnostic clinics, so the choice is about coverage, cadence, and cost, not about one being “real” and the other not.
Full-body lab membership: 100+ biomarkers, doctor-reviewed, tracked over time.
So is Function Health worth it?
Function Health is worth it if you are a maximalist who values the widest marker count, a structured two-draw year, and a 6-month retest, and the $365 fee fits your budget without a second thought. For that buyer, it is one of the most complete consumer testing memberships available, and the breadth is a feature you will genuinely use rather than pay for and forget.
It is harder to justify if you want one clean annual baseline with plain-language guidance, because then you are paying premium pricing for cadence and volume you may not touch. In that case, a leaner full-body membership covers the same screening goal for less, and you spend the savings somewhere it matters more.
Our take, from a desk that compares these services for a living: run the numbers on Superpower’s $199 annual membership before you commit to Function. Same category, lower price, plainer output, and an AI concierge built in. If after that you still want Function’s extra markers and the mid-year retest, you will buy it knowing exactly what the premium is paying for, which is the only way to buy anything in this category without regret.
Who Function Health is genuinely built for
Strip away the marketing and Function Health has a clear ideal customer. It is the person who treats their own health as a data project and will actually do the work the structure asks of them. Concretely, that is someone with a family history worth watching (heart disease, diabetes, thyroid or autoimmune conditions), someone mid-protocol on a supplement or training plan who wants to see whether it is moving the right markers, or someone whose doctor flagged a borderline value last year and who wants a wide, repeatable way to keep an eye on it. For all three, the 160+ markers, the second draw, and the 6-month retest are not overkill. They are the reason to pick Function over anything leaner.
It is a poorer fit for the curious first-timer who feels fine and just wants a baseline. That person will get a dashboard of flags they are not equipped to prioritize, feel a spike of anxiety, and often wish they had started with something that hands back a verdict instead of raw data. Both people are common. The mistake is buying the maximalist product when you are the baseliner, or the baseliner product when you are the maximalist. The category does not fail people. Mismatched expectations do.
How to actually use a 160-marker panel without drowning
If you do choose Function, or any wide panel, a little discipline turns the firehose into a tool. Work in this order and it stays manageable.
- Triage the flags first. Ignore the greens on the first pass and look only at what is out of range. Most panels surface a handful, not dozens.
- Separate the movers from the noise. A marker that is far out of range, or one tied to a symptom you actually have, gets attention. A single value a hair outside a population range, with no symptoms, is usually a candidate for the retest, not a crisis.
- Cluster related markers. Do not read ferritin alone. Read it next to transferrin saturation and CRP. Do not read fasting glucose alone. Read it with HbA1c and fasting insulin. Patterns across markers mean far more than any single number.
- Take the top two or three to a clinician. This is the step that turns data into care. Bring the printout, ask specific questions, and let a professional put the numbers in the context of your history.
- Use the retest as your reality check. The 6-month draw tells you whether a flag was real and trending or just a one-time wobble. That trend line, not the first snapshot, is where the genuine value of a membership lives.
Follow that sequence and 160 numbers stops being overwhelming and starts being what it is supposed to be: a wide, early-warning map you revisit twice a year.
Related reading on Vital Signs Today
- Function Health Cost: Is the Annual Membership Worth It?
- Function Health Discount Code and Deals (2026)
- Is Function Health Legit? What to Know Before You Join
- Superpower Blood Test Review (2026): Is It Worth the Membership?
Frequently asked questions
Is Function Health worth it for most people?
It depends on how you test. If you want 160+ biomarkers, two draws, and a 6-month retest each year and the $365 fee is comfortable, then yes, Function Health is worth it for thorough trackers. If you mainly want one annual baseline with clear scores, a $199 membership like Superpower covers the same screening job for less, so it is worth comparing first.
What do Function Health reviews say about accuracy?
Themes users commonly report in Function Health reviews are positive on data depth and on a dashboard that organizes a large number of markers clearly. Testing runs through standard partner labs. The most common fair criticism is interpretation: 160+ numbers is a lot to digest, which is one reason some readers prefer a service that leads with plain-language scores.
How is Function Health different from Superpower?
Function Health is broader and pricier: 160+ biomarkers, two draws, a urinalysis, and a retest for $365 a year. Superpower is leaner and cheaper: 100+ biomarkers in one annual draw, 17 plain-language scores, an action plan, and an AI concierge for $199 a year ($399 in NY and NJ). Function suits maximalist trackers; Superpower suits once-a-year baseliners.
Is Function Health legit and safe to use?
Yes, Function Health is a legitimate lab membership that delivers the markers it advertises through standard labs. As with any direct-to-consumer test, treat any out-of-range result as a reason to consult a clinician rather than a diagnosis. These services screen and track; they do not replace medical care.
Can I switch from Function Health to a cheaper option later?
Yes. Both Function Health and Superpower are annual memberships, so you can test with one this year and reassess next year. If cost is your main hesitation, many readers start with the lower-priced annual baseline, see how much of the data they actually act on, and only upgrade to a broader, pricier panel if they find they need the extra markers.
Is $365 a year worth it over the long run?
That depends on how many years you plan to test and how much of the data you act on. At $365 a year, three years of Function is close to $1,100, versus roughly $600 for a $199 annual membership over the same span, a gap of about $500. If you genuinely use the extra markers, the two draws, and the retests every year, that premium buys real capability. If you find yourself glancing at the dashboard once and acting on two or three numbers, you are paying yearly for coverage you leave unused, and a leaner membership makes more financial sense.
Do I have to fast before a Function Health blood test?
Yes, for the metabolic and lipid markers. Glucose, insulin, and a full cholesterol panel need an 8 to 12 hour fast, so plan a morning draw and only water beforehand. Skipping the fast is one of the most common ways people end up with a falsely flagged triglyceride or glucose value and a wasted re-draw. Water is fine and actually helps, since dehydration can distort several markers.
How many blood draws does Function Health require?
Function Health is built around two draws per membership year plus a urinalysis, with a 6-month retest option. The second draw is what turns a single snapshot into a trend line and is a large part of what you pay the premium for. If you would rather do one comprehensive annual draw, a single-draw membership like Superpower covers the core screening job for $199 and is worth pricing out first.
Will Function Health give me a diagnosis?
No. Function Health is a screening and tracking service, not a clinic. It shows you a wide slice of your blood chemistry and flags what is out of range, but it does not diagnose or treat. Any concerning or out-of-range result is a reason to see a licensed clinician who can interpret it against your full history. Treat the dashboard as an early-warning map, not a verdict.
