Function Health vs Rythm Health
Function Health is cheaper to start ($365 vs $948 per year, lowest published plans). Function Health scores higher overall (9.0 vs 8.0).
By Julian Caraulani · prices checked
Quick verdict
Our pick between the two: Function Health
Function Health scores 9.0/10 against 8.0 for Rythm Health, ahead on price. Rythm Health can still be the better fit: it is best for people who want a small panel every month at home and will use the trend.
Side by side
| Function Health | Rythm Health | |
|---|---|---|
| Lowest price | $365/yr (yearly membership, auto-renews) | $948/yr (renews every 30 days; skip up to 90 days) |
| Our score | 9.0/10 | 8.0/10 |
| Treatments | Longevity memberships | At-home test kits |
| Medication in price | Not stated | Not stated |
| Drugs dispensed | Not stated | Not stated |
| Labs | Not stated | Not stated |
| Membership | Not stated | Not stated |
| Insurance | No; self-pay | No; self-pay |
| States | 48 states (not RI, HI), per its own site (2026-10-31) | All 50 states, 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. | Monthly, renews every 30 days; cancel anytime with no fee; skip up to 90 days. 90-day money-back on first test only if completed and requested within 7 days of results. Charges reversible only before the kit is prepared to ship. |
| FDA warning letters | None found (October 31, 2026) | None found (October 31, 2026) |
| Trustpilot | 4.5/5 (3,102 reviews) | 4.8/5 (3,296 reviews) |
| Best for | People who want the widest yearly panel, retested twice, in one membership. | People who want a small panel every month at home and will use the trend. |
| Prices checked | 2026-10-31 | 2026-10-31 |
Function Health: a closer look
Yearly membership: 100+ markers at Quest, a mid-year retest and a clinician summary. We searched the FDA warning-letter database on October 31, 2026 and found no letter naming Function Health.
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.
Rythm Health: a closer look
Monthly at-home capillary kit run in its own CLIA-certified, CAP-accredited lab. We searched the FDA warning-letter database on October 31, 2026 and found no letter naming Rythm Health.
In its favour
- Runs samples in its own CLIA-certified, CAP-accredited lab
- Available in all 50 states
- Skip up to 90 days between tests
To weigh
- $79 headline is per month: about $948/yr before shipping and tax; Rythm's own affiliate page values it at $1,200/yr.
- Auto-renews every 30 days.
- No physician-patient relationship or medical advice; critical results are your responsibility to act on.
- Money-back guarantee is narrow: first test only, claim within 7 days of results.
Which should you choose?
Choose Function Health
Best for people who want the widest yearly panel, retested twice, in one membership. Its lowest all-in plan is $365/yr (yearly membership, auto-renews).
Check Function Health's priceChoose Rythm Health
Best for people who want a small panel every month at home and will use the trend. Its lowest all-in plan is $948/yr (renews every 30 days; skip up to 90 days).
Check Rythm Health's priceFunction Health vs Rythm Health: questions people ask
Is Function Health or Rythm Health cheaper?
Function Health starts lower at $365 per year versus $948 at Rythm Health, comparing each program's lowest all-in plan.
Which is better, Function Health or Rythm Health?
On our published score Function Health rates 9.0 and Rythm Health rates 8.0. Function Health is best for people who want the widest yearly panel, retested twice, in one membership; Rythm Health is best for people who want a small panel every month at home and will use the trend.
Do Function Health and Rythm Health offer the same treatments?
Function Health: Longevity memberships. Rythm Health: At-home test kits.
Does either include the medication in the price?
Function Health: not stated. Rythm Health: not stated.
Blood Test Watchdog compares testing services. It is not medical advice, does not interpret results and does not publish reference ranges as advice. Talk to a licensed clinician about which tests you need and what your results mean. Partner links may earn us a commission; our score never depends on it. Compare other programs.