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Quick answer: In the InsideTracker vs Function Health debate, InsideTracker is built for athletes who want fitness-focused biomarkers tied to performance and wearables, while Function Health is the more clinically thorough full-body membership at $365 per year for 160+ biomarkers across two draws. But if your goal is a complete annual baseline you can actually act on without overpaying, Superpower is the pick we recommend: $199 per year for 100+ biomarkers, 17 plain-language health scores, a personalized action plan and an AI concierge. Choose InsideTracker for athletic optimization, Function Health for maximum marker depth, and Superpower for the best whole-body value.
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.
| Service | Best for | Pricing | Visit |
|---|---|---|---|
| Superpower | Whole-body optimization | ~$179/yr membership | View › |
| Function Health | Annual deep panel | Annual membership | View › |
InsideTracker vs Function Health vs Superpower at a glance
| Feature | InsideTracker | Function Health | Superpower |
|---|---|---|---|
| Price | $189–$589 per plan | $365/yr | $199/yr ($399 NY & NJ) |
| Biomarkers | ~13 (Essentials) to ~54 (Ultimate) | 160+ | 100+ (~150 with ratios) |
| Draws per year | Per plan; ~$149/yr cuts retest cost | 2 draws + urinalysis | 1 annual draw |
| Standout | Tiered plans, retest discounts | 6-month retest, clinician-reviewed | 17 health scores + action plan + AI concierge |
| Best for | Athletes who retest often | Most clinically thorough | Best-value full-body baseline |
InsideTracker vs Function Health vs Superpower at a Glance
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.
All three are direct-to-consumer blood testing services, but they were built for different people. The fastest way to choose is to match the product to your actual goal, not to the longest marker list.
InsideTracker leans toward performance. Function Health leans toward clinical depth. Superpower leans toward a clear, affordable yearly baseline that a normal person can read and use. That framing matters more than any single number, because the most expensive panel is the one whose results you never act on.
Before you weigh marker counts, it helps to understand what these services share. None of them is your doctor. All three order lab work you could technically request through a physician, run it through certified labs, and then wrap the results in software that explains what the numbers mean. What you are really paying for is the convenience of ordering it yourself, the breadth of the panel, and the quality of the interpretation layer on top. Keep that in mind, because it reframes the whole comparison: you are not buying tests, you are buying a way to understand your body that you will actually keep using.
InsideTracker: built for athletes and optimizers
InsideTracker’s positioning has always centered on athletic and longevity optimization. It pairs blood biomarkers with inputs like DNA and fitness-tracker data, then generates food, supplement and lifestyle recommendations aimed at performance and recovery. For a serious runner, lifter or biohacker who wants markers framed around training, that angle is genuinely useful.
The tradeoff is scope and pricing structure. InsideTracker is sold as tiered plans rather than one flat membership, and prices vary by panel, so check the provider for current pricing before you buy. It is excellent at the optimization story, but it is not trying to be the broadest whole-body screen on the market.
What genuinely sets InsideTracker apart is the way it connects the dots between your blood and your behavior. It leans on markers that athletes care about, things like inflammation, cortisol, testosterone, vitamin D, ferritin and glucose, and then frames each one as a lever you can pull with training, food or sleep. If you wear a fitness tracker, it can fold resting heart rate and activity into the picture, which makes the advice feel personal rather than generic. For someone whose whole identity is built around a training block, that performance framing is the difference between a lab report and a coaching tool.
Function Health: the clinically thorough option
Function Health is the deepest of the three on raw marker count. The membership runs $365 per year and covers 160+ biomarkers, with two draws per year plus a urinalysis and a 6-month retest built in. That cadence is its real strength: you get a baseline, then a structured recheck a few months later, which is how you actually catch a trend.
It is also the priciest of the everyday options here, and its AI chat layer is newer. If you want the most clinically exhaustive picture and you do not mind paying for it, Function Health earns its place. For many people, though, the extra markers are not markers they will ever discuss with a clinician.
The two-draws-per-year structure deserves a second look, because it is the quiet reason some people prefer Function. A single snapshot tells you where you stand; two snapshots six months apart tell you which direction you are moving, and direction is what actually changes behavior. If you are the type who wants to fix a number and prove you fixed it, that built-in recheck is worth real money. The flip side is honesty about human nature: plenty of people who buy a two-draw plan only ever complete the first draw, at which point they have paid a premium for a cadence they did not use.
Superpower: the full-body baseline most people should start with
Superpower is a $199 per year membership that includes one comprehensive annual blood draw covering 100+ biomarkers (about 150 once you count calculated ratios). What sets it apart is the layer on top of the numbers: 17 plain-language health scores, a personalized action plan, and an AI concierge you can actually chat with about your own results.
In New York and New Jersey the price is $399 due to state lab rules, so factor that in if you live there. It is worth being clear that Superpower is a screening and tracking service, not a diagnostic clinic. But for the core job most readers want, getting a broad, readable annual baseline at a fair price, it is the most sensible entry point of the three.
The plain-language layer is easy to underrate until you have stared at a raw lab PDF and felt nothing but confusion. Turning 100+ values into 17 readable scores and a short action plan is the difference between data and a decision. That is the whole reason Superpower tends to be the panel people actually repeat: it respects that most buyers are curious adults, not clinicians, and it hands them something they can act on that same afternoon.
How each service actually works, from order to results
The buying experience matters more than most comparison tables admit, because friction is what kills follow-through. Here is the realistic flow for each.
With InsideTracker, you choose a plan, then complete your blood draw either at a partner lab or, in many areas, through an at-home phlebotomy visit. Your results populate a dashboard that layers recommendations on top, and if you connect a wearable, that data feeds the analysis. The experience is polished and performance-flavored, which is exactly its intended audience.
With Function Health, the draws are typically done at a national lab partner, and the model is built around that twice-yearly cadence. You get a large results dashboard, clinician sign-off on the ordering, and a structured retest. The depth is the selling point, and so is the clinical framing.
With Superpower, the pitch is a single, low-friction annual draw, often arranged conveniently, feeding a dashboard designed for a non-expert to read on their own. The whole design philosophy is to remove reasons not to do it, which is why it works well as a first full-body baseline for someone who has never done one.
The pattern is clear. If the ordering and interpretation are painful, the markers do not matter, because you will not repeat the test. The service you will still be using next year usually wins in practice, even if it is not the one with the biggest number on the box.
Markers, Clinician Review and Retest Cadence
On marker depth, Function Health leads with 160+, Superpower follows with 100+ (roughly 150 counting ratios), and InsideTracker is narrower but more performance-targeted. Raw count is the headline number, yet it is the least useful one in isolation. Twenty markers you understand beat 160 you never open.
Retest cadence is where the real difference lives. Function Health bakes in two draws and a 6-month retest, which is ideal if you are actively chasing a number down. Superpower runs on one comprehensive annual draw, which fits the once-a-year baseline habit most people can realistically keep. InsideTracker’s retesting depends on the plan you choose.
All three deliver results through a dashboard rather than a doctor’s visit, so none of them replaces your physician. Any result outside the normal range should be reviewed with a licensed clinician before you make changes. These tools tell you what to ask about; they do not diagnose.
What a broad panel actually covers
To make the marker counts concrete, a comprehensive full-body panel like Superpower’s or Function’s usually spans several categories rather than piling up in one. Expect metabolic markers (glucose and often an insulin or HbA1c read), a full lipid panel for heart risk, thyroid function, key hormones, inflammation markers such as high-sensitivity CRP, nutrient status including vitamin D and ferritin, kidney and liver function, and a complete blood count. InsideTracker samples across similar territory but curates toward the markers that move with training and recovery. Understanding these buckets is more useful than the raw total, because it tells you whether a panel actually covers the systems you care about.
Accuracy and lab certification
A fair question is whether direct-to-consumer results are trustworthy. In practice, these services send your sample to the same category of certified reference labs your doctor uses, so the analysis itself is standard clinical-grade work. The differences between services live in which markers they order, how they set their reference ranges, and how they explain the result, not in whether the blood test is real. What varies is interpretation, and that is exactly where the plain-language layer earns its keep.
Cost and Cost Per Insight
Here is the honest math. Superpower is $199 per year for 100+ biomarkers, which is the lowest everyday price of the three for a comprehensive panel. Function Health is $365 per year for 160+ biomarkers across two draws, so you pay more but get a second look built in. InsideTracker is plan-dependent, so a precise yearly figure depends on the tier you select.
If you divide price by markers, Superpower delivers the most coverage per dollar. If you divide price by clinical thoroughness and retests, Function Health makes a stronger case. The wrong way to decide is to chase the biggest number; the right way is to ask which service you will still be using a year from now.
For most people researching insidetracker vs function health and landing here because they are not actually elite athletes, the answer is the one that is broad, readable and affordable enough to repeat annually.
One more cost angle people forget: the true price is not just the sticker, it is the sticker divided by how often you actually use it. A $199 panel you complete and read beats a $365 plan where you only ever finish the first of two draws. Value in this category is measured in decisions made, not markers purchased, and the cheapest way to waste money here is to overbuy depth you will never open.
Full-body lab membership: 100+ biomarkers, doctor-reviewed, tracked over time.
Two quick scenarios to make the choice concrete
Abstract comparisons only get you so far. Picture two common readers.
The marathoner mid-training block. She logs every run, wears a tracker, and wants to know whether her ferritin and inflammation are holding up under mileage so she can adjust before a performance dip. For her, InsideTracker’s training-flavored recommendations and wearable integration fit naturally, and frequent retesting is part of the plan. The performance lens is the product she actually wants.
The busy 40-year-old who has not tested in years. He is not chasing a race, he just has a vague sense that he should know his numbers before something sneaks up on him. He wants one broad, readable snapshot without a research project. For him, Superpower’s single annual draw, plain-language scores and action plan are exactly right, and the price makes it easy to repeat next year. If he later finds a worrying number, that is when a deeper or clinician-led route makes sense.
Most people reading a three-way comparison are the second person, not the first. That is usually why the value-focused baseline wins for the majority, while the performance tool wins for the minority who genuinely live in a training plan.
How to prepare, and how to read results without overreacting
Whichever service you pick, a little prep protects the accuracy of your numbers. Most comprehensive panels want a morning, fasted draw, since food skews glucose and lipids for hours. Heavy exercise the day before can transiently bump inflammation and muscle markers, so an easy day beforehand gives a cleaner read. Alcohol the night before can nudge liver values and triglycerides. Note any supplements you take, because biotin in particular can interfere with certain lab assays. These are small habits, but they are the difference between a baseline you can trust and one you have to second-guess.
The harder skill is reading the results calmly. A broad panel almost guarantees at least one value sits slightly outside the reference range, because ranges are built around the middle of the population and normal people scatter. A single marginal flag is usually a prompt to look closer or retest, not a diagnosis. The trap with 100 or 160 markers is that more numbers means more chances for a scary-looking outlier that turns out to be noise. This is exactly why the interpretation layer matters: a service that tells you which flags are meaningful and which are trivial saves you from a week of needless panic, and it is why plain-language scoring often beats raw marker depth for a first-timer.
Where DNA and wearables genuinely add value
InsideTracker’s use of DNA and fitness-tracker data is not a gimmick, but it is worth being clear-eyed about. Genetic inputs can help contextualize a result, for example flagging a predisposition worth watching, and wearable data on resting heart rate, sleep and activity can make lifestyle advice feel tailored rather than generic. The honest caveat is that these inputs guide recommendations, they do not diagnose anything, and their value is highest for people already deep into training and tracking. For someone who just wants a yearly snapshot, that extra machinery is more than they need, which again pushes the casual user toward the simpler baseline.
A word on data, privacy and cancellation
Because these are health services, it is worth checking three practical things before you commit. First, how your data is stored and whether it is shared, since blood results are about as personal as data gets. Second, whether the membership auto-renews, so an annual plan does not quietly bill you for a year you did not intend to use. Third, how easy it is to export your own results, because your baseline is far more valuable when you can carry it to a clinician. None of these change the medical value of the tests, but they are the difference between a smooth experience and an annoying one, so read the current terms on each provider’s site before buying.
Who Each One Is Really For
Pick InsideTracker if you are an athlete or serious optimizer who wants biomarkers interpreted through a training-and-performance lens, with wearable and DNA inputs feeding the recommendations.
Pick Function Health if you want maximum clinical depth, a higher marker count, and a built-in 6-month retest, and the $365 per year price does not bother you.
Pick Superpower if you want the best all-around value: a broad 100+ biomarker baseline, 17 health scores written in plain English, an action plan and an AI concierge, all for $199 per year. For the majority of health-conscious adults who want one clear yearly read on their body, this is the recommended choice, and the reason is simple: it is the panel you are most likely to read, understand and actually repeat.
If you still cannot decide, use this shortcut. Are you optimizing an athletic body you already track closely? Go InsideTracker. Do you want the deepest possible clinical picture and will genuinely use two draws a year? Go Function Health. Do you want one clear, affordable yearly baseline you will actually read and repeat? Go Superpower. The best test is not the longest one, it is the one that changes what you do on Monday morning.
Related reading on Vital Signs Today
- InsideTracker Alternatives: 5 Options Worth Comparing (2026)
- InsideTracker Review (2026): Good for Athletes, but Worth It?
- InsideTracker Cost and Plans: A Real Price Breakdown (2026)
- Superpower Blood Test Review (2026): Is It Worth the Membership?
Frequently Asked Questions
InsideTracker vs Function Health: which is better?
It depends on your goal. InsideTracker is better for athletes who want performance-focused biomarkers tied to training and wearables. Function Health is better for clinical depth, with 160+ biomarkers, two draws and a 6-month retest for $365 per year. If you want a broad, affordable annual baseline instead, Superpower at $199 per year is the value pick.
Is InsideTracker worth it compared to a full-body membership?
InsideTracker is worth it if performance optimization is your priority and you value its food, supplement and lifestyle recommendations. If you mainly want a complete yearly snapshot of your health, a full-body membership like Superpower (100+ biomarkers, 17 health scores, $199 per year) usually gives more general coverage for the money.
How many biomarkers do InsideTracker, Function Health and Superpower test?
Function Health covers 160+ biomarkers, Superpower covers 100+ (about 150 counting calculated ratios), and InsideTracker is narrower and plan-dependent, focused on performance-relevant markers. For current InsideTracker panel details and pricing, check the provider directly.
Which one should I choose if I just want one clear yearly checkup?
For a single, readable annual baseline, Superpower is the easiest to recommend. You get one comprehensive draw, 100+ biomarkers, plain-language health scores and a personalized action plan for $199 per year ($399 in New York and New Jersey). Just remember it is a screening and tracking service, so review any abnormal result with a clinician.
Are direct-to-consumer blood tests as accurate as my doctor’s lab?
The analysis itself is done at the same category of certified clinical labs your physician uses, so the raw results are standard clinical-grade work. The real differences between services are which markers they order, how they set reference ranges, and how well they explain your numbers. None of them diagnoses disease, so any abnormal value should be reviewed with a clinician.
Can I use these instead of seeing a doctor?
No. All three are screening and tracking tools, not a replacement for medical care. They are excellent for spotting trends and knowing what to ask about, but a licensed clinician should interpret anything abnormal in the context of your symptoms and history before you change treatment or supplements.
