Function Health vs InsideTracker: Comprehensive Panel vs Biomarker-Plus-DNA
Function Health and InsideTracker are the two most credible DTC biomarker-testing services for users who want longevity context from their lab data. Function delivers breadth: 100+ biomarkers per draw, twice a year, with MD review of every result, all-inclusive at $365/year. InsideTracker delivers depth and longevity: a 15-year track record (founded circa 2009 as Segterra), 54 biomarkers per Ultimate panel, an optional DNA layer (261 gene variants), and the strongest customer-service responsiveness signal in our cohort. The choice usually comes down to whether you want the broadest panel for the lowest annual cost or specific differentiators InsideTracker offers.
Function Health
3.9Comprehensive lab-testing membership with MD review of every biomarker
InsideTracker
3.7Established blood-and-DNA biomarker testing with the strongest customer-service signal in our cohort
Reviewed by Designing Longevity Editorial·Last verified May 1, 2026
Bottom line
Function Health for most users on cost-effectiveness alone. $365/year for two semi-annual full panels covering 100+ biomarkers each is materially better value than InsideTracker's $149 membership plus $340-$589 per Ultimate test (54 biomarkers each). Choose InsideTracker if you specifically want the DNA add-on (Function does not offer one), category-specific tests starting at $99 (Function is membership-only), or the longer track record and customer-service responsiveness (InsideTracker replies to 94% of negative Trustpilot reviews within one week, the strongest signal in our lab-testing cohort).
Side-by-side at a glance
Who wins for each use case
We pick a winner per criterion and explain the reasoning. Skip to whichever rows match how you'd actually use the platform.
Panel breadth per dollar
Winner: Function HealthFunction delivers 100+ biomarkers per draw, twice a year, for $365 ($30/month equivalent). InsideTracker's Ultimate panel is 54 biomarkers per draw at $340 with membership ($489 total for one Ultimate test, $829 for two). Function is roughly 2-3x more cost-effective on a panel-per-dollar basis. The cost gap is real and consistent across testing cadences.
Track record and operational maturity
Winner: InsideTrackerInsideTracker has been operating since circa 2009 (15+ years) with peer-reviewed methodology research published in PubMed Central. Function Health is a faster-growing newer entrant ($298M Series B at $2.5B valuation in November 2025) but lacks comparable academic publication track record. For users who weight operational maturity, InsideTracker has the longer history.
Customer-service responsiveness
Winner: InsideTrackerInsideTracker replies to 94% of negative Trustpilot reviews within one week, the strongest customer-service responsiveness signal in our lab-testing cohort. Function Health's BBB profile carries recurring complaints about customer-support response time and unclear add-on pricing, a softer signal. If responsive customer service matters to you, InsideTracker is the clearer choice.
External review volume and signal
Winner: Function HealthFunction has 4.3/5 across roughly 1,009 reviews on Trustpilot. InsideTracker has 4.1/5 across roughly 290 reviews. Both pages are clean (no fraud notices), but Function's order-of-magnitude larger sample is more informative. The ratings are close enough that volume tips Function on this row.
DNA-and-biomarker integration
Winner: InsideTrackerInsideTracker offers an optional 261-gene-variant DNA Kit that integrates with the biomarker recommendations. Function Health does not offer a comparable DNA layer. For users who want their biomarker insights contextualized with genetic data, InsideTracker is the only option in our cohort that combines both.
Targeted single-test pricing
Winner: InsideTrackerInsideTracker offers category-specific tests starting at $99 for users with focused questions (cardiovascular, metabolic, etc.). Function Health is membership-only at $365/year with no targeted single-test option. For users who want to spot-check a specific area rather than buy a full panel, InsideTracker is the only realistic option in our cohort.
Pricing structure simplicity
Winner: Function HealthFunction runs a single-tier $365/year membership with no upgrade path; what you pay is what you get. InsideTracker has membership pricing ($149/year) plus per-test costs ($99 to $589 depending on test) plus optional DNA add-ons. The InsideTracker structure is more flexible but harder to evaluate at signup; users routinely report being surprised that the $149 membership does not include the actual test cost.
Clinician interpretation depth
Winner: Function HealthFunction provides licensed-clinician written notes on every biomarker, organized by strengths, areas to watch, and recommendations. InsideTracker delivers personalized recommendations mapped to its 10 published Healthspan Categories framework but does not include comparable clinician-written notes per biomarker. Function's interpretation is more clinically structured.
Rubric scores side-by-side
Same six dimensions we use on every provider profile, weighted to a single 0-5 score. Click through to either profile for the verification details behind each row.
Licensure 20% weight
Accreditation 20% weight
Transparency 20% weight
Product quality 15% weight
Pricing 15% weight
Customer service 10% weight
Pricing in plain terms
Function: $365/year all-inclusive ($30/month equivalent) for two semi-annual full panels with MD review. InsideTracker: $149/year membership + $340-$589 per Ultimate test (54 biomarkers each), or category tests from $99, or DNA Kit add-on. For one Ultimate test plus membership: roughly $489/year. For two: roughly $829/year. For the 4-test annual bundle: $1,305-$1,781/year. Function is materially better on panel-per-dollar value across all comparable cadences. Where InsideTracker pricing makes sense: targeted category tests at $99, or the DNA layer for users who want genetic context Function does not offer.
Read the full profiles
This comparison summarizes the head-to-head call. The full provider profiles include verification items, regulatory history, public-review aggregation, and the signup walkthrough.