Is Function Health legit?
Checked · by Julian Caraulani
Quick answer
Yes, by the public record we checked, Function Health is a real testing service, and it names the lab that runs the samples (Quest Diagnostics). We searched the FDA warning-letter database on October 31, 2026 and found no letter naming Function Health. On Trustpilot it scores 4.5/5 from 3,102 reviews. Its lowest published all-in plan is $365 per year (Function Membership, yearly membership, auto-renews), read on its own site on October 31, 2026. Availability: 48 states (not RI, HI), per its own site (2026-10-31). Cancellation: Cancel and rejoin anytime; no pauses; no refunds for prior payments; auto-renews annually at then-current price.
- FDA warning letters
- None found (October 31, 2026)
- Trustpilot
- 4.5/5, 3,102 reviews
- Lowest all-in plan
- $365/yr, yearly membership, auto-renews
- Lab
- Quest Diagnostics
- States
- 48 states (not RI, HI), per its own site (2026-10-31)
- Our score
- 9.0/10, #1 of 21
Function Health, from $365/yr
Lab: Quest Diagnostics · Sample: In-lab draw at Quest · Cancellation: Cancel and rejoin anytime; no pauses; no refunds for prior payments; auto-renews annually at then-current price
Price checked Oct 31 · No email needed
The public record
We searched the FDA warning-letter database on October 31, 2026 and found no letter naming Function Health.
- No FDA warning letter found
- Names the lab that runs the samples: Quest Diagnostics
- Publishes an all-in yearly price
- States its cancellation terms
- Lab
- Quest Diagnostics. Not stated as CLIA/CAP on Function's pages; Function says it uses 'medical-grade tests and labs that meet the highest clinical standards'.source
- Sample
- In-lab draw at Quest; at-home draw available (fee not published)
- Clinician review
- Clinicians review every result and write a summary; critical results trigger a provider call. Lab and medical services are provided by independent third parties; Function says it is not a lab or medical provider.source
- HIPAA and data use
- Function may act as a HIPAA business associate but says HIPAA does not apply to all data it processes. Says it does not sell personal information other than for targeted advertising; creates aggregated/de-identified data; needs your authorization to use health data for marketing. Claims SOC 2 Type II and 'HIPAA-aligned'.source
- Privacy policy
- Its policy says: "HIPAA does not apply to all personal information that we process."source
- HSA / FSA
- HSA/FSA eligible, per its own site
- Doctor's order
- Ordered through Function's third-party medical providers as part of the membership; no own-doctor order needed.source, checked October 31, 2026
- States
- Not sold in HI, RI. Its site says: "Function is offered in 2,000+ Quest labs across 48 states (but not yet Rhode Island, Hawai'i, or Puerto Rico)."source, checked October 31, 2026
- Legal record
- Function filed a false-advertising suit against Superpower over biomarker counts (C.D. Cal. 2:26-cv-00810, filed Jan 26, 2026). No suit against Function found in our search.source, checked October 31, 2026
CLIA certification is a lab-quality licence, not proof a test is useful for you. Any US lab can be looked up on the CMS QCOR CLIA lookup by name or ZIP code.
What customers say
On Trustpilot, Function Health scores 4.5/5 from 3,102 reviews.
Recurring complaints are the useful signal, more than the average. Where a theme is price, compare it with the dated prices below.
Read the reviews →What Function Health charges
| Plan | Per month |
|---|---|
Function Membership checked 2026-10-31Two draws a year: the full panel, then a retest of selected markers 3 to 6 months later. Clinician summary of results. source, 2026-10-31 | $365 |
- Lab
- Quest Diagnostics
- Sample
- In-lab draw at Quest; at-home draw available (fee not published)
- Clinician review
- Clinicians review every result and write a summary; critical results trigger a provider call. Lab and medical services are provided by independent third parties; Function says it is not a lab or medical provider.
- Membership
- Not stated on their site
- Labs
- Not stated on their site
- Insurance
- No; self-pay
- Cancellation
- Cancel and rejoin anytime; no pauses; no refunds for prior payments; auto-renews annually at then-current price.
The trade-offs
In its favour
- Measures ApoB, Lp(a), fasting insulin, omega-3 and heavy metals in the base price
- Two draws a year included
- Clinicians review every result
To weigh
- No refunds for prior payments, and membership auto-renews at the then-current price.
- '160+ lab tests' counts the mid-year retest; the annual draw is 100+.
- NY/NJ residents can be billed lab fees on top of the membership, amount not disclosed upfront.
- Not available in Rhode Island, Hawaii or Puerto Rico.
Is Function Health the cheapest?
Longevity memberships: #6 of 9 on price, at $365/yr.
Lower: Empirical Health $190/yr, Superpower $199/yr, Maximus $199.99/yr.
Price is one of five criteria in our score. Every program's price · ranked on price, care and safety.
What we could not verify
- At-home draw fee amount
- Exact NY/NJ lab fee amount
- Exact Function Day 2026 dates for the $499/2-year offer (search snippets of Function's homepage/FAQ say June 23 to July 1/2; Empirical says June 23 to July 1, 2026; the pricing page still carries a footnote that a Function Day offer expired 10/8/2026, and /c/function-day now 404s)
- CLIA/CAP wording on Function's own pages
- BBB rating
Ready to check Function Health yourself?
From $365/year (yearly membership, auto-renews). A clinician decides whether treatment is right for you.
Visit Function HealthCommon questions
Is Function Health legit?
Yes, by the public record we checked, Function Health is a real testing service, and it names the lab that runs the samples (Quest Diagnostics). We searched the FDA warning-letter database on October 31, 2026 and found no letter naming Function Health. On Trustpilot it scores 4.5/5 from 3,102 reviews. Its lowest published all-in plan is $365 per year (Function Membership, yearly membership, auto-renews), read on its own site on October 31, 2026. Availability: 48 states (not RI, HI), per its own site (2026-10-31). Cancellation: Cancel and rejoin anytime; no pauses; no refunds for prior payments; auto-renews annually at then-current price.
Is Function Health a scam?
We searched the FDA warning-letter database on October 31, 2026 and found no letter naming Function Health. Function Health publishes its prices and its cancellation terms on its own site, and its samples are run by Quest Diagnostics. Our score for it is 9.0/10 on the same five criteria we use for every program.
How much does Function Health really cost?
From $365 per year (Function Membership, yearly membership, auto-renews).
Does a doctor review Function Health results?
Clinicians review every result and write a summary; critical results trigger a provider call. Lab and medical services are provided by independent third parties; Function says it is not a lab or medical provider.
Is Function Health covered by HIPAA?
Function may act as a HIPAA business associate but says HIPAA does not apply to all data it processes. Says it does not sell personal information other than for targeted advertising; creates aggregated/de-identified data; needs your authorization to use health data for marketing. Claims SOC 2 Type II and 'HIPAA-aligned'.
Can I cancel Function Health?
Cancel and rejoin anytime; no pauses; no refunds for prior payments; auto-renews annually at then-current price.
How did Blood Test Watchdog check Function Health?
We read its own pricing pages and date every price, search the FDA warning-letter database with a control term that must return results, and record its public review score where one exists. Commission plays no part in its score.