InsideTracker Vs Function Health

InsideTracker and Function Health both draw blood and return a report, but they bill on opposite logic. InsideTracker sells a test: $249 to $589, no commitment, buy another when there is a reason to. Function Health sells a year: $499, two draws included, renewing on a calendar. That single difference shapes everything downstream — how many markers you get, whether the report ends in numbers or in instructions, and what a second data point costs. Neither includes physician time in the price, and neither prescribes.

Public litigation

Function Health is the plaintiff in an open Lanham Act suit against Superpower Health (C.D. Cal., filed January 2026). Allegations only — Justia docket 2:26-cv-00810.

What each platform actually is

InsideTracker

InsideTracker is the oldest brand in direct-to-consumer biomarker testing and sells single tests rather than a subscription. Essentials covers roughly 20 markers at about $249; Ultimate covers roughly 48 at about $589. Blood is drawn at a partner lab, or collected at home for an added fee of about $99. The output is the actual product: for every result outside its target range, the platform generates a personalized list of food, exercise, and supplement changes drawn from published academic research and calibrated with training load in mind. Add-ons include an InnerAge biological-age score at about $179 and single-marker retests at $29 to $89. There is no physician included, no prescription pathway, and no membership to cancel.

Function Health

Function Health sells a $499 annual membership instead of individual tests. That covers a 100+ biomarker base panel drawn twice a year across heart, metabolic, thyroid, immune, nutrient, hormone, kidney and liver, blood count, and heavy-metal groups. Draws route through Quest and LabCorp partner sites, and results typically post 7 to 14 days later. Every result carries clinician-written commentary, and the dashboard flags deltas between draws so the second year of data is more useful than the first. Raw results download as PDF and CSV. Advanced panels run $100 to $400 each, a live physician consult is $150 to $300, and Function Health does not prescribe.

Side by side on the standard rubric

The same nine criteria used on every platform comparison here, so the two models can be read against identical rows rather than each company's own framing.

What each actually costs

The headline prices are not comparable units. One is a purchase, the other is a year. The table converts both into the same layers.

InsideTracker has no year-two floor. Buy one Ultimate test at about $589 and never return, and that is the entire cost. Skip a year and you pay nothing. The published $650 to $900 range for an engaged year assumes one full test plus one retest. The crossover point is worth calculating before you commit: two Ultimate tests inside twelve months run roughly $1,178, more than double the $499 that buys two Function Health draws. One Essentials test at about $249 is half Function Health's annual price. Test once a year and the per-test model costs less; test twice and it does not.

Function Health's $499 renews on a calendar rather than on your behavior. Both draws are included whether or not you book them, and there is no one-time onboarding fee, so year two opens at the same $499 rather than dropping. The published $750 to $1,200 year-one range assumes one advanced panel and one physician consult layered on. Two further costs sit off the pricing page: any draw beyond the two included is a separate purchase, and a draw at a non-partner location — which happens when no Quest or LabCorp site is near your ZIP — adds $30 to $80 each time.

Where InsideTracker leads

• No commitment. Nothing renews. You test when something changes — a training block, a new protocol, a symptom — and pay nothing in the years you skip.
• Recommendation engine. Each out-of-range marker produces specific food, exercise, and supplement changes drawn from published academic research, so the report ends in actions rather than values.
• Entry price. About $249 for roughly 20 markers is the lowest cost of entry to a broad panel from an established brand in this category.
• Single-marker retests. At $29 to $89 you can re-check one marker after an intervention rather than repurchasing a full panel to see whether one thing moved.
• Training-load context. Targets and recommendations are calibrated for athletes, and the scientific advisory board is athlete-focused, so results are read against training volume rather than a sedentary default.

Where Function Health leads

• Panel breadth. 100+ base markers against roughly 48 on InsideTracker's top tier, including heavy metals, immune, and kidney and liver groups in the base price.
• Cadence in the price. Two draws a year are included rather than purchased each time, which makes a year-over-year trend line the default rather than an extra decision.
• Clinician-written commentary. Every result carries written interpretation, and the dashboard flags deltas between draws rather than presenting each panel in isolation.
• Add-on depth. Advanced cardiac panels, partner-run cancer screening, and hormone deep-dives are available at $100 to $400 without leaving the platform.
• Draw logistics and export. Quest and LabCorp partner draws carry no extra collection fee, and full raw results export as PDF and CSV for any physician you hand them to.

Trade-offs to weigh

InsideTracker trade-offs

• Panel size. Roughly 48 markers at the top tier, about half Function Health's base panel. Markers outside the performance-oriented set are not covered.
• Interpretation is algorithmic. No clinician reviews the report before it reaches you. InsideTracker does not prescribe and includes no physician time at any tier.
• Frequent testing gets expensive. Two full tests inside a year cost more than a $499 membership covering two draws, so semi-annual users pay a premium for the flexibility.
• Every purchase is separate. At-home collection adds about $99, InnerAge adds about $179, and each retest is its own checkout, so a year's spend is assembled rather than quoted.

Function Health trade-offs

• It bills whether you draw or not. The $499 renews on schedule, and canceling does not refund an included draw you never booked.
• Commentary, not a plan. Results come with written interpretation, but the platform does not output a food, exercise, and supplement protocol keyed to each marker.
• Clinician time costs extra. A live physician consult is $150 to $300 per session on top of the membership, and Function Health does not prescribe.
• Draw-site dependency and access. Where no partner site is near you, each draw adds a $30 to $80 out-of-network fee, and membership access has historically opened in waves rather than immediately.

Who should pick each

Pick InsideTracker if: you train seriously, test around events rather than on a calendar, and want a report that ends in changes rather than numbers. It also fits a tight budget, since about $249 buys a real panel with nothing renewing behind it. And if you are tracking one intervention — repleting ferritin, raising vitamin D, moving an omega-3 index — a $29 to $89 single-marker retest costs a fraction of any full panel.

Pick Function Health if: you want the widest panel at this price and will genuinely use both included draws, which is the condition that makes the membership cheaper than buying two tests. It suits people building a multi-year baseline rather than answering one question, people who already have a physician to hand results to, and anyone who wants cardiac or hormone add-on panels available without changing platforms.

Who should pick neither

Both platforms end at the same place: a report, and a suggestion that you take it to somebody else. If you already know the result is likely to require treatment — low testosterone, thyroid dysfunction, a metabolic picture heading the wrong way — you are buying an intermediate step you will pay to repeat inside a program that includes a clinician. These fit better, listed alphabetically.

• Lifeforce — a narrower panel with expanded hormone coverage, a bundled clinician, and prescriptions where clinically indicated.
• Marek Health — testing paired with clinician-led protocol design rather than an algorithmic or written report.
• Opt Health — a physician-led telehealth membership with testing and treatment inside one price.
• A specialist referral, through insurance. If one symptom brought you here — fatigue, unexplained weight change, low libido — an endocrinology or primary care referral orders the relevant markers and owns the follow-up. The panel is far narrower, but the person reading it is accountable for what happens next.

Can you use both?

This is the rare pairing where stacking is not duplication. The panels overlap on common metabolic and lipid markers, but the products do different jobs: Function Health delivers breadth twice a year, and InsideTracker sells the thing Function Health does not — a $29 to $89 re-read of one marker whenever you want it. A membership at $499 plus two or three targeted retests lands near $600 for the year, below the $750 to $1,200 most Function Health members reach by buying an advanced panel and a consult instead.

The situation where that pairing earns its cost is a single tracked intervention between draws. Function Health's included cadence is semi-annual, so a change made in month one has no data behind it until month six. If you start iron for a low ferritin, push vitamin D, or change training volume, a single-marker retest tells you whether it worked while you can still adjust. Running two full memberships, by contrast, is a duplicated purchase — and buying a full InsideTracker Ultimate test alongside a Function Health membership every year costs more than $1,000 for two overlapping snapshots.

What the rubric does not capture

Business model shapes behavior in ways no rubric row scores. A membership bills on a date, so it creates a mild obligation to draw — which is why Function Health members tend to accumulate a trend line whether or not they intended one. A per-test model bills on an event, so InsideTracker use tends to cluster around reasons: a race, a new protocol, a symptom. Neither pattern is the correct one in general, but they produce different data. One gives you evenly spaced points that are easy to compare and sometimes measure nothing in particular. The other gives you points that always had a reason and are harder to line up.

What happens when a result is out of range is the second gap. InsideTracker's answer is a generated protocol: eat this, train that way, consider this supplement. Function Health's is a clinician-written note attached to the value. Both are one-directional. Neither will call you, neither knows what medication you take, and neither can escalate. That distinction matters most in the specific case where an algorithm and a note both under-react — a marker that is only mildly out of range but moving fast across two draws. A physician reading a trend would flag the trajectory. Nothing in either base product is built to.

Lock-in and design intent finish the picture. There is nothing to cancel at InsideTracker, which removes a common failure mode: paying for a second year you never used. Function Health's annual term creates that risk, and canceling mid-year does not refund an undrawn panel. In exchange, the membership is the cheaper way to reach two draws. Underneath, the two products imagine different people. InsideTracker is designed around someone in a training block who wants to know what to change this month. Function Health is designed around someone building a record they expect to still be reading in five years. Decide which of those you actually are before comparing marker counts.

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