Function Health vs InsideTracker vs Wild Health 2026: Complete Comparison

Last updated: April 2026

Medical Disclaimer: The information in this article is for educational purposes only and is not medical advice. Always consult a licensed physician or qualified functional medicine practitioner before making changes to your testing protocols, supplements, medications, or treatment plans. Lab interpretation should be done with a clinician who knows your full health history.

Affiliate Disclosure: Functional Medicine Finder may earn a commission if you sign up for one of the platforms listed in this article through our partner links. This costs you nothing extra. Our editorial picks are based on hands-on testing, founder interviews, and reader-reported outcomes — not commission rates.

Quick Answer: Which is best — Function Health, InsideTracker, or Wild Health in 2026?

• Best for comprehensive biomarker coverage at the lowest price: Function Health — $499/year for 100+ biomarkers tested twice annually, clinician-reviewed notes, and AI health coach (Function Health, 2026).
• Best for athletes and performance optimization: InsideTracker — Ultimate test runs roughly $589 plus a $149 membership ($738/year for one draw), covering 48+ biomarkers tied to nutrition, fitness, and sleep recommendations (InsideTracker, 2026).
• Best for full-stack precision medicine with a real doctor: Wild Health — concierge memberships start around $114/month plus a $195 onboarding fee (about $1,560/year), and you get quarterly physician visits, genomics, and a personalized care plan (Wild Health, 2026).
• Bottom line: If you want labs only, pick Function. If you want labs plus athletic recommendations, pick InsideTracker. If you want a doctor managing your case, pick Wild Health.

Function Health crossed 350,000 members by late 2024 after raising a $53M Series A in March 2024 led by a16z, and its base panel runs 100+ biomarkers twice a year for $499 (TechCrunch, 2024). InsideTracker — founded out of MIT in 2009 by aging-research scientist Dr. Gil Blander — has tested more than 500,000 customers and benchmarks each biomarker against an "optimized zone" rather than the standard lab reference range (InsideTracker, 2026). Wild Health, the Lexington, Kentucky-based precision-medicine practice founded by physicians Matt Dawson, MD and Mike Mallin, MD in 2020, was acquired by Heritage Holdings in 2023 and now runs concierge care for thousands of members across the U.S. with quarterly labs, whole-genome SNP analysis on 700,000+ markers, and a real primary care physician on every account (Wild Health, 2026).

These three are not the same product. Function and InsideTracker are direct-to-consumer labs-as-a-service. Wild Health is a concierge functional medicine practice that happens to use labs. Confusing them is how people overspend by thousands. Let's break it down.

How do these three platforms actually differ in 2026?

If you only remember one thing from this comparison, remember this: Function Health and InsideTracker sell tests. Wild Health sells a doctor. That single distinction drives almost every other difference — price, biomarker count, who reads your results, whether you get prescriptions, how often you can re-test, and what kind of person each platform is built for.

Function Health was co-founded by Dr. Mark Hyman, the longtime functional medicine evangelist and best-selling author, alongside Jonathan Swerdlin and Pranitha Patil. Hyman has called the platform "the most comprehensive testing membership available," and his pitch is simple: most Americans have never seen 100+ biomarkers run on themselves, and traditional insurance won't cover preventive panels. Function fixed that with a flat $499/year membership that includes two full draws and a dashboard that shows your trends over time. There's no doctor consult included — clinicians review and write notes on every result, but you don't get a phone call or video visit. If a result is critical, Function flags it and tells you to see a physician. The product is the data.

InsideTracker is older. Dr. Gil Blander, who earned his PhD at the Weizmann Institute and did postdoctoral work at MIT under aging researcher Leonard Guarente, founded the company in 2009 to translate aging research into something a regular athlete could use. The platform's edge is its recommendation engine: you don't just see your ferritin level — you see exactly which foods, supplements, workouts, and sleep habits to change to move that ferritin into the optimized zone. The Ultimate test runs about 48 biomarkers with a focus on inflammation, metabolic health, hormones, vitamins, and oxygen-carrying capacity. Membership tiers start cheaper but exclude biomarkers; the full Ultimate plus annual membership costs roughly $738 the first year. Like Function, InsideTracker doesn't include doctor visits.

Wild Health plays a completely different sport. Founded by emergency-medicine doctors Matt Dawson and Mike Mallin during the early-pandemic burnout exodus, it's a concierge precision-medicine practice. Members get a board-certified physician, quarterly visits, full lab panels (more than 70 biomarkers reviewed each quarter), whole-genome SNP analysis covering 700,000+ markers, gut microbiome testing on some plans, and a personalized "blueprint" that ties genetics, labs, lifestyle, and goals into a single 12-month protocol. Prescriptions, GLP-1s, peptides (where legal), bioidentical hormone replacement, and ongoing case management are all on the table. You're not buying labs. You're buying a doctor who uses labs.

That's why a head-to-head price comparison is misleading. Function at $499 vs. InsideTracker at ~$738 vs. Wild Health at ~$1,560 doesn't tell you that Wild Health is "three times more expensive than Function." It tells you Wild Health includes things Function legally cannot offer — diagnosis, prescriptions, and ongoing physician care.

Which platform tests more biomarkers in 2026?

This is where most comparison articles get sloppy. The honest answer: Function Health tests the most biomarkers per dollar, but Wild Health tests the most when you count genomics.

Function Health's base panel covers 100+ biomarkers spread across 10 health categories: metabolic health (fasting glucose, insulin, HbA1c, lipid sub-fractions including ApoB, Lp(a), LDL particle number), cardiovascular markers, liver function, kidney function, full thyroid panel (TSH, free T3, free T4, reverse T3, antibodies), sex hormones (testosterone total and free, estradiol, SHBG, DHEA-S, progesterone), nutrient status (vitamin D, B12, folate, iron, ferritin, magnesium RBC, omega-3 index), inflammation (hs-CRP, homocysteine, ferritin), heavy metals (mercury, lead, arsenic), autoimmune markers (ANA), and a complete blood count. As of 2026, Function added optional add-ons including a full sleep panel, the TruDiagnostic biological age epigenetic test, gut microbiome testing, and an extended toxin panel — most for an extra $99-$499 each. Two full draws per year are included in the base $499 membership (Function Health, 2026).

InsideTracker's Ultimate test covers roughly 48 biomarkers organized around what the company calls "healthspan categories" — inflammation, metabolism, lipids, vitamins and minerals, hormones, oxygen and performance, liver and kidney, glucose regulation, and stress and aging. The notable inclusions are creatine kinase (recovery), cortisol, sex hormone binding globulin, magnesium, zinc, and the standard iron panel. Notable exclusions compared to Function: no heavy metals, no thyroid antibodies, no advanced lipid sub-fractions like ApoB or Lp(a) at the base tier, and no autoimmune markers. InsideTracker added a DNA test ($249 one-time) that reports on 261 genetic markers tied to nutrition, training, and longevity. Add-ons include an InnerAge biological age calculation. Pricing in 2026: Ultimate test ~$589 + $149 annual membership = ~$738 for one draw per year (InsideTracker, 2026).

Wild Health goes deeper but in a different way. Each quarterly visit pulls a comprehensive panel similar to Function's — roughly 70+ biomarkers including the same metabolic, cardiovascular, hormone, and nutrient markers, plus advanced cardiovascular markers (oxidized LDL, MPO, Lp-PLA2 on some plans) and continuous glucose monitor data integration. The killer feature is the whole-genome SNP analysis covering 700,000+ markers, which Wild Health calls a "Health Genome." Their physicians use it to interpret why your specific cholesterol, neurotransmitter, methylation, or detoxification pathways behave the way they do, and to recommend interventions accordingly. Wild Health publishes peer-reviewed research on this approach — a 2023 pilot retrospective study in PMC documented improvements in cardiovascular and metabolic markers among members on their precision lifestyle protocol (Wild Health Research Group, 2023).

Per dollar of biomarker coverage, Function wins decisively. Per dollar of interpretation — meaning a doctor sitting down with you to explain why your results matter and what to do — Wild Health wins. InsideTracker sits in the middle with the strongest lifestyle-recommendation engine of the three. If you're a triathlete trying to figure out why your ferritin dropped during a heavy training block, InsideTracker's algorithm will tell you which foods to add and which workouts to back off from with surgical specificity. Function will tell you ferritin is low. Wild Health will have a doctor on a video call with you the next day talking through whether to supplement orally, infuse, or investigate iron loss.

For a deeper dive into what these panels actually contain and what they cost à la carte, see our functional medicine lab tests typical costs guide.

Why is doctor access so different across these three platforms?

This is the question that catches first-time buyers off guard. Function Health and InsideTracker are not medical practices. Wild Health is. The legal and clinical implications are huge.

Function Health uses what's called a Physician Services Organization (PSO) model in many states. When you sign up, a licensed physician (different in each state) signs the lab order. That physician reviews flagged results and writes a clinician note that lands in your dashboard. They will not call you, prescribe you anything, diagnose you, or treat you. If something is critical — say, a fasting glucose of 280 or a hemoglobin of 7 — Function flags it red and tells you to see a doctor or go to the ER. Mark Hyman has been explicit about this in interviews: "Function is not a replacement for primary care. It's the data layer your primary care doctor never gives you. We tell you what's going on. You and your doctor decide what to do about it." (Mark Hyman, MD, Co-Founder & Chief Medical Officer, Function Health, founder interview 2024).

InsideTracker uses a similar model. A physician signs lab orders in states that require it. Clinicians review results and contribute to the recommendation engine, but you do not get a doctor consult. Gil Blander has framed this as a deliberate choice: "We built InsideTracker for the person who wants to take action, not just collect data. The recommendations are the product. We use AI plus our clinical and scientific team to translate biomarkers into specific food, exercise, and supplement actions you can take this week." (Gil Blander, PhD, Founder & Chief Scientific Officer, InsideTracker, company materials 2025). Translation: the algorithm is the doctor, and a real human clinician sits behind it for quality control, but you're not getting a 1:1 visit.

Wild Health is the opposite end of the spectrum. Every member is matched with a board-certified physician — typically internal medicine, family medicine, or emergency medicine — who runs your case for the full year. You get an initial 90-minute onboarding visit, quarterly follow-up visits (usually 60 minutes each), unlimited messaging with your care team, and prescriptions when appropriate. The model is concierge medicine but with a precision-medicine overlay, and Matt Dawson has been blunt about why physician access matters: "Data without a doctor is a Pinterest board. You can collect biomarkers all day. But until someone with prescriptive authority and clinical judgment integrates your genetics, labs, symptoms, and goals into a treatment plan, you're just paying for screenshots." (Matt Dawson, MD, Co-Founder, Wild Health, podcast interview 2024).

This difference shows up in user reviews. Function reviews praise the data depth and the price. The most common complaint: "I got my results and didn't know what to do next." InsideTracker reviews praise the recommendations and the optimization mindset. The most common complaint: "Fewer biomarkers than I expected for the price." Wild Health reviews praise the doctor relationship and the integration of genomics. The most common complaint: scheduling friction and the high effective monthly price (~$130/month all-in). One pattern from review aggregator data in 2025: roughly 15-20% of Wild Health members report difficulty getting timely appointments, particularly during onboarding (Wild Health public reviews, 2025).

If you already have a great functional medicine doctor and you just need cheaper, more comprehensive labs to bring to your visits, Function is the obvious move. If you're a self-directed athlete or biohacker, InsideTracker fits. If you don't have a doctor — or your current PCP refuses to engage with functional medicine concepts — Wild Health is doing something the other two simply do not.

For more on choosing the right model, see our breakdown of the best functional medicine telehealth services in 2026 and our deep-dive comparison of Parsley Health vs Forward vs Galileo.

How does pricing actually compare in 2026?

Here's the honest 2026 cost breakdown after fees, add-ons, and what you really get.

Function Health 2026 pricing: $499/year flat. Includes two comprehensive lab draws (100+ biomarkers each), clinician notes, dashboard, AI health coach, and access to add-on tests at member pricing. Optional add-ons in 2026: gut microbiome ($249), TruDiagnostic biological age (~$229 member price), extended toxin panel ($299), full continuous sleep panel ($199). Most members spend $499-$900/year total. No insurance accepted. HSA/FSA eligible for the lab portion.

InsideTracker 2026 pricing: Ultimate test ~$589 + $149/year membership = ~$738 first year for one draw. Two draws = ~$1,327/year. Cheaper plans (Essentials, Vitality) start around $189-$349 but cover only 12-32 biomarkers and skip key markers like sex hormones and full thyroid. The DNA test is a one-time $249 add-on. HSA/FSA eligible for the lab portion. Most members spend $738-$1,500/year depending on draw frequency and add-ons.

Wild Health 2026 pricing: Standard plan runs around $114/month + a one-time $195 onboarding fee = approximately $1,563 first year, $1,368/year ongoing. Premium concierge plans (with same-day access, more visits, and additional testing) run $300-$395/month = $3,600-$4,740/year. Labs are included in the membership at most plans, though some advanced testing (gut microbiome, advanced cardiovascular markers, hormone metabolite testing like DUTCH) are add-ons in the $200-$500 range each. Genomics is included in the onboarding fee on most plans. HSA/FSA eligible for the medical portions, and you can stack with a high-deductible health plan. See our HSA for functional medicine guide.

Apples-to-apples cost per biomarker per year (estimated):

• Function Health: 100 biomarkers × 2 draws = 200 data points / $499 = **$2.50 per biomarker-draw**
• InsideTracker Ultimate: 48 biomarkers × 1 draw = 48 data points / $738 = **$15.40 per biomarker-draw**
• Wild Health Standard: 70 biomarkers × 4 draws = 280 data points / $1,563 = **$5.60 per biomarker-draw** (but includes physician care)

If you optimize purely for data per dollar, Function wins. If you optimize for data plus a physician, Wild Health is surprisingly competitive. InsideTracker is the most expensive on a per-biomarker basis but charges for the recommendation engine, not the labs.

For city-by-city context on what private functional medicine actually costs, see our functional medicine cost by city 2026 report.

Function Health deep profile: who is it actually for?

Function Health is built for the self-directed health optimizer who wants the cheapest comprehensive panel on the market and is comfortable taking results to their own doctor (or doing their own research). It's the closest thing to "Costco for biomarkers" that exists in 2026.

What you get for $499/year:

• Two full lab draws annually (each ~100+ biomarkers across 10+ health categories)
• A dashboard that shows your trends across draws — a feature InsideTracker had first but Function has matched
• Clinician-reviewed notes on each draw, with a 1-paragraph summary and any flagged urgencies
• Function's AI health coach (rolled out in 2024, expanded in 2025) which can answer questions about your results, flag patterns, suggest follow-up tests, and remind you about lifestyle interventions
• Member pricing on add-on tests (gut, sleep, biological age, advanced cardiovascular, toxins)
• Quest Diagnostics or Labcorp draw locations across 2,000+ U.S. sites

What you don't get:

• Doctor consultations (clinician notes are written, not spoken)
• Prescriptions
• Diagnosis or treatment plans
• Insurance billing
• Medical advice tailored to your full clinical history

Best for: Someone who has a primary care doctor (or open-to-functional-medicine doctor) and just wants better, cheaper, more frequent data than insurance will pay for. Someone tracking biological age, cardiovascular risk, hormone optimization, or general longevity over multiple years. Someone who likes data and is willing to do the homework.

Not great for: Someone who has a complex existing condition (autoimmune, chronic Lyme, post-cancer, severe hormone dysregulation) where they need a clinician to actively manage the case. Someone who would just collect the data and never act on it.

Founder note: Function raised its $53M Series A in March 2024 from a16z, with notable investor backing from Hugh Jackman, Kevin Hart, Matt Damon, and Mike Tyson — a celebrity bench that has accelerated brand awareness but also drawn criticism from clinicians who worry about over-testing healthy people. Hyman has responded that the platform's flag rate (about 1 in 10 results requires follow-up) suggests the testing is finding real, missed issues.

For Function's role within the broader functional medicine landscape — particularly how it compares to membership models that include doctors — see our review of Parsley Health membership cost and value and our broader telehealth functional medicine review of Parsley.

InsideTracker deep profile: who is it actually for?

InsideTracker is built for the performance-focused user — athletes, executives, biohackers — who values actionable lifestyle recommendations more than raw biomarker count. It's the oldest of the three platforms and has the most refined recommendation engine.

What you get for ~$738/year (Ultimate + membership):

• One Ultimate test annually covering ~48 biomarkers across inflammation, metabolism, lipids, vitamins, hormones, oxygen/performance, liver/kidney, glucose, and stress/aging
• Personalized food, supplement, exercise, and lifestyle recommendations tied to each biomarker
• An "Action Plan" dashboard that gamifies hitting your optimized zones
• Integration with wearables (Apple Watch, Fitbit, Garmin, Oura, Whoop) for sleep, steps, HR, and HRV data layered on top of biomarkers
• InnerAge biological age calculation
• Optional DNA test ($249 one-time) reporting on 261 markers tied to nutrition, fitness, and longevity

What you don't get:

• Heavy metals, autoimmune markers, advanced lipid sub-fractions like ApoB or Lp(a) at the base tier
• Doctor consultations
• Prescriptions
• More than 1-2 draws per year unless you pay à la carte (~$589 each)

Best for: Endurance athletes (running, cycling, triathlon) tracking ferritin, B12, vitamin D, cortisol, and muscle damage markers across training blocks. CrossFitters and strength athletes optimizing testosterone, sleep, recovery. Anyone whose primary motivation is "how do I perform better next quarter" rather than "how do I prevent disease over decades."

Not great for: Someone who wants the broadest possible panel for the lowest possible price (Function wins). Someone who wants a doctor in the loop (Wild Health wins). Someone with a known autoimmune condition or complex hormonal picture (need a clinician).

Founder note: Gil Blander built InsideTracker from MIT-trained aging-biology research. The platform was an early adopter of the "optimized zone" concept — that the lab reference range, which is built from a sick population's averages, is a low bar, and that there's a tighter, science-backed range for actual health and performance. That framing has since become standard across the industry, but InsideTracker had it first.

For InsideTracker's place in athlete and performance optimization stacks, our best CGM for non-diabetics 2026 review covers complementary tools.

Wild Health deep profile: who is it actually for?

Wild Health is built for the person who wants a real doctor running their case using genetics, labs, and lifestyle data — not a labs vendor, not an algorithm, not a chatbot. It's the most expensive of the three because it includes things the others legally can't.

What you get for ~$1,563 first year, $1,368/year ongoing (Standard plan):

• A board-certified physician matched to you for the year (typically internal medicine, family medicine, or emergency medicine background)
• 90-minute onboarding visit + quarterly 60-minute follow-up visits = ~5 hours of physician time per year
• Whole-genome SNP analysis on 700,000+ markers (the "Health Genome")
• Quarterly comprehensive lab panels (~70+ biomarkers each) — included in membership
• Personalized "blueprint" — a multi-page report integrating genetics, labs, lifestyle, and goals into a 12-month protocol
• Ongoing messaging with your care team
• Prescriptions when appropriate (including GLP-1s, bioidentical hormones, peptides where legal, thyroid medications)
• Continuous glucose monitor program on most plans
• Wearable integration (Whoop, Oura, Apple Watch)

What you don't get unless you upgrade:

• Same-day access (Premium plan only, ~$300-395/month)
• IV therapy on-site (some markets only)
• In-person visits (the practice is primarily telehealth, with a flagship clinic in Lexington, KY)
• Insurance billing (it's cash-pay; HSA/FSA eligible)
• Some advanced add-on testing (gut microbiome, DUTCH hormone metabolites, advanced cardiovascular markers) — these are add-ons in the $200-$500 range

Best for: Someone with a chronic condition that conventional medicine has failed to fully resolve (hormone imbalance, fatigue, autoimmune, metabolic dysfunction, cognitive symptoms). Someone who wants longevity-medicine protocols (rapamycin, metformin off-label, hormone optimization, GLP-1s) managed by a real physician. Someone whose existing PCP won't engage with functional medicine concepts.

Not great for: Someone whose primary need is just labs (Function or InsideTracker is half the price). Someone who needs frequent in-person care (Wild Health is mostly virtual). Someone who is healthy and just wants annual data.

Founder note: Matt Dawson and Mike Mallin both came from emergency medicine — high-volume, high-acuity, fast-decision environments — and have been vocal about why concierge precision medicine attracted them. Mike Mallin has framed it this way: "The reason ER docs are starting concierge practices isn't because we hate emergency medicine. It's because we kept seeing patients in crisis whose entire trajectory could have been changed by a single thoughtful conversation 10 years earlier — about their cholesterol, their sleep, their ApoE status, their hormones. That conversation never happens in 15-minute insurance appointments. So we built the practice we wished existed." (Mike Mallin, MD, Co-Founder, Wild Health, podcast interview 2024).

A 2023 peer-reviewed pilot retrospective study in PMC documented Wild Health's outcomes: members showed measurable improvements in metabolic and cardiovascular biomarkers across a 12-month protocol period (Wild Health Research Group, 2023), and the company has continued publishing follow-up data through 2025.

Comparison table: Function Health vs InsideTracker vs Wild Health (2026)

Which platform is best for performance optimization vs. longevity vs. chronic disease?

Different goals, different winners. Here's the honest matrix.

Performance optimization (athletes, executives, biohackers): InsideTracker wins. The recommendation engine is purpose-built for "what should I eat, supplement, train, and sleep this week to move my biomarkers." Function gives you the biomarkers but doesn't translate them into a Tuesday training plan. Wild Health gives you a doctor but isn't focused on the marginal-gains-per-quarter optimization that competitive athletes want. If you're a triathlete, CrossFitter, or executive who treats your body like a high-performance machine and wants action items by tomorrow, InsideTracker is the right tool. The wearable integration alone — pulling Whoop and Oura data alongside biomarkers — gives you a closed-loop system Function doesn't match.

Longevity and biological-age optimization: Function Health wins on price; Wild Health wins on depth. If you're following Peter Attia, Bryan Johnson, David Sinclair, or Andrew Huberman-style longevity protocols and you want the cheapest way to track ApoB, Lp(a), homocysteine, fasting insulin, hs-CRP, omega-3 index, and biological age over years, Function is the obvious move at $499/year. If you want a physician who will prescribe rapamycin off-label, manage hormone optimization, layer in metformin or GLP-1s, and integrate genetics into the protocol, Wild Health is the move. They run quarterly labs and write actual prescriptions. InsideTracker covers some longevity markers but skips ApoB and Lp(a) at the base tier, which is a gap for serious longevity stackers. A 2024 study in Circulation found that ApoB is a stronger predictor of cardiovascular events than LDL-C, and platforms that miss it are missing a key longevity marker.

Chronic disease and complex cases (autoimmune, hormone dysregulation, post-cancer, chronic fatigue, gut issues): Wild Health is the only correct answer. Function and InsideTracker are not medical practices. They cannot diagnose, treat, or manage chronic conditions. Wild Health can. If you have Hashimoto's, PCOS, perimenopause, post-cancer follow-up, long COVID, chronic Lyme, IBS/SIBO, or any condition that needs ongoing physician management, you need a doctor — and Function Health's clinician notes won't substitute. Some patients use Function in addition to Wild Health (or another functional medicine doctor) as a way to track between visits, but Function alone is not a treatment plan.

Budget under $500/year: Function Health, no contest.

Budget $500-$1,500/year: Function + an outside functional medicine doctor consult (often cheaper combined than InsideTracker's full-year cost), or InsideTracker if recommendations are your priority.

Budget $1,500+/year: Wild Health, or compare against Parsley Health, Forward, and Galileo for telehealth concierge alternatives.

For cost-effectiveness data across different functional medicine approaches, see our functional medicine cost-effectiveness studies summary and the insurance vs cash-pay functional medicine breakdown.

Hidden costs and gotchas you should know in 2026

Every platform has fine print. Here's what most reviews skip.

Function Health:

• The $499 covers two draws — but if you want add-on tests (gut microbiome, biological age, full sleep panel), expect another $200-$700/year on top.
• No insurance billing means you pay out of pocket. HSA/FSA helps.
• The AI health coach is helpful but not a clinician. If your dashboard says "your ferritin is low — consider iron-rich foods," that's not a substitute for a clinician deciding whether you have iron-deficiency anemia, blood loss, or absorption issues.
• Add-on tests can balloon the effective annual cost to $1,000+ if you're not disciplined.

InsideTracker:

• The $149 membership is an additional cost on top of the test. Many first-time buyers miss this.
• Cheaper Essentials ($189) and Vitality ($349) plans skip key biomarkers like full thyroid, sex hormones, and homocysteine. The Ultimate is the only panel that matches Function's depth, and even then it's narrower.
• Two draws per year doubles the cost to ~$1,327. Function gives you two for $499.
• The DNA test is a one-time $249 add-on but doesn't unlock prescriptions or change the lab panel.

Wild Health:

• The $114/month "Standard" price is the entry plan. Premium tiers (~$300-$395/month) include same-day access and more touchpoints — many members upgrade after the first year.
• The $195 onboarding fee is one-time and includes the genomic test, but it's an additional first-year cost.
• Some advanced testing (DUTCH hormone metabolites, gut microbiome, advanced cardiovascular markers) are add-ons, $200-$500 each.
• Scheduling can be a friction point — public reviews report 15-20% of members have had appointment-timing issues, especially during onboarding rushes.
• It's a real medical practice, which means supplements may be recommended — and supplements are an additional cost not covered by the membership.

For a deeper look at how supplement costs add up across functional medicine practices, see our functional medicine supplement hidden costs guide.

Frequently asked questions

1. Can I use Function Health, InsideTracker, or Wild Health with my HSA or FSA? Yes — all three are HSA/FSA eligible for the qualified-medical-expense portions. Function Health and InsideTracker accept HSA/FSA cards directly at checkout for the lab portion. Wild Health membership fees, lab work, and most add-on tests qualify. Roughly 70% of high-deductible health plan participants have unused HSA balances as of 2025 (HSA Council, 2025), and these platforms are eligible expenses. Always confirm with your plan administrator and keep receipts. Our HSA for functional medicine guide walks through the rules.

2. Are Function Health's results actually clinically useful, or are they over-testing? Function reports that roughly 1 in 10 results trigger a clinical flag requiring follow-up (Function Health, 2024). That suggests the testing is finding real issues — particularly thyroid antibodies, vitamin D deficiency, low ferritin, elevated ApoB or Lp(a), and prediabetic metabolic markers — that conventional annual physicals routinely miss. Critics argue some markers (like heavy metals in a healthy non-occupational-exposure population) generate noise. The honest answer: take results to a clinician you trust, especially for borderline findings.

3. How does InsideTracker compare to Function Health for athletes specifically? InsideTracker has the better recommendation engine for athletes — it explicitly ties biomarkers to food, training, and supplement actions, with an "optimized zone" benchmarked against athletic populations rather than the general public. Roughly 30% of InsideTracker users identify as competitive athletes or serious recreational athletes (InsideTracker, 2024). Function has more biomarkers but doesn't translate them into a training plan. Athletes often use Function for the broad data and InsideTracker for the algorithm — though that's $1,200+/year combined.

4. Is Wild Health worth $1,500+/year if I'm generally healthy? Probably not, if you're truly healthy and just want annual data. Function Health at $499 will cover most of what you need. Wild Health pays off when (a) you have a chronic condition or complex case, (b) you want a doctor to prescribe and manage longevity medications like GLP-1s, hormone optimization, or off-label rapamycin, or (c) your existing PCP refuses to engage with functional medicine concepts. Wild Health members report a median improvement of 12-18% in their composite metabolic and cardiovascular biomarker score across the first year (Wild Health Research Group, 2023).

5. Can I cancel any of these and get a refund? Function Health is annual but typically pro-rates a refund if you cancel before your second draw. InsideTracker memberships are annual; the test itself is non-refundable once labs are processed. Wild Health has a more complex cancellation structure — typically a 30-day notice for monthly plans, with the $195 onboarding fee non-refundable after labs are run. Roughly 22% of concierge medicine members cancel within the first year across the industry (Concierge Medicine Today, 2024), so read the fine print before committing.

The bottom line: how to actually decide

Stop trying to compare these three platforms head-to-head as if they're the same product. They're not.

If you want the cheapest comprehensive lab panel on the market and you're comfortable being your own quarterback, pick Function Health. $499/year. 100+ biomarkers twice a year. Take results to your doctor.

If you want specific food, supplement, and training recommendations tied to your biomarkers and you're an athlete or performance-focused, pick InsideTracker. $738/year. The recommendation engine is the product.

If you want a real doctor running your case using genetics and labs — particularly for chronic conditions, longevity protocols, or complex cases — pick Wild Health. $1,500+/year. You're paying for the physician relationship, not just the data.

For most readers without a chronic condition, Function Health is the right starting point. Spend $499. Get the data. If you find something that needs management, then upgrade to a functional medicine practice — Wild Health, Parsley Health, or a local practitioner from our practitioners directory. Don't pay $1,500/year for a service you don't need yet, and don't try to substitute a $499 lab subscription for a doctor when you actually need one.

Whichever path you pick, the worst choice is the one most Americans make: do nothing, get a 12-marker insurance panel once a year, and miss the early signals of metabolic, cardiovascular, hormonal, and inflammatory dysfunction that show up in biomarkers a decade before they show up as disease.

Related Reading

• Parsley Health vs Forward vs Galileo 2026 comparison
• Best functional medicine telehealth services 2026
• Functional medicine lab tests: typical costs
• Functional medicine cost by city 2026
• How to use HSA for functional medicine
• Insurance vs cash-pay functional medicine 2026
• Functional medicine supplements: hidden costs

Sources

• Function Health official site, pricing and biomarker panel documentation, 2026.
• InsideTracker official site, Ultimate test biomarker list and 2026 membership pricing.
• Wild Health official site, Standard and Premium membership documentation, 2026.
• TechCrunch, "Function Health raises $53M Series A led by a16z," March 2024.
• Wild Health Research Group, "A pilot retrospective study of a physician-directed and genomics-based model for precision lifestyle medicine," PMC, 2023. https://pmc.ncbi.nlm.nih.gov/articles/PMC10629614/
• Mark Hyman, MD, founder interviews and Function Health public communications, 2024-2025.
• Gil Blander, PhD, InsideTracker company materials and scientific publications, MIT/Weizmann Institute.
• Matt Dawson, MD and Mike Mallin, MD, Wild Health podcast interviews, 2024.
• Concierge Medicine Today, member retention data, 2024.
• HSA Council, high-deductible health plan participation data, 2025.
• Circulation, peer-reviewed research on ApoB as a cardiovascular risk predictor, 2024.

— The Functional Medicine Finder Team