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Clinics · Comparison

Function Health vs Rythm Health

Both are primarily bloodwork & longevity providers, so the differences are in consult model, what is bundled, who prescribes, and price.

Function Health logo Function Health From $365/yr Read the Function Health review →
vs
Rythm Health logo Rythm Health From $79/month Read the Rythm Health review →

Side-by-side comparison

Function Health logoFunction HealthRythm Health logoRythm Health
Our score9.8 / 109.1 / 10
Starting price$365/yr$79/month
Primary serviceBloodwork & longevityBloodwork & longevity
All servicesBloodworkBloodwork
Consult modelUnconfirmedUnconfirmed
PrescriberUnconfirmedUnconfirmed
LabsIncludedIncluded
InsuranceCash payCash pay
Availability48 states50 states
CancellationSelf-serve onlineSelf-serve online
Trustpilot4.5 / 5 (3,118 reviews)4.8 / 5 (3,440 reviews)
Regulatory / legal recordNone foundNone found
Visit ↗Visit ↗

* Provisional score: one or two criteria could not be verified.

Which one is right for you

Choose Function Health if…

Adults who want twice-yearly broad lab testing at a flat cash price and do not need prescribing or treatment from the same service.

  • Core lab panel (160+ tests across two draws per year) included in the $365 annual fee
  • Self-serve cancellation from account settings, documented in the Terms of Service
  • Single published annual price; HSA/FSA eligible

Choose Rythm Health if…

People who want to track a short set of hormone, lipid and metabolic markers every month or two from home, and who will take results to their own doctor for any treatment.

  • Published per-kit price of $79 for repeat testing, with the option to skip up to 90 days between kits
  • Home collection with the Tasso+ device; no lab visit or phlebotomist
  • Self-serve cancellation from the account dashboard

Price: what you actually pay

Function Health

Pricing page (seen 2026-11-05): '$1/day', 'Charged annually at $365'; includes '160+ lab tests annually' across two draws (100+ tests at the annual visit, 60+ tests 3 to 6 months later), clinician review of every result and a personalized protocol. Footnote: the $365 first-year price applies in all states except New York and New Jersey, where testing costs more (amount not stated). Add-on tests and imaging cost extra; the FAQ lists the Annual MRI at $999 for members. Terms s.13(b)(i): the subscription auto-renews at Function's then-current price.

Rythm Health

Homepage (seen 2026-11-05): '$79/test', billed as a monthly subscription; first kit 30% off at $55.30 under a 'limited time' offer; '+ shipping & tax' with the shipping amount not shown before checkout. Each kit tests 25+ biomarkers (separate men's and women's panels: hormones including total and free testosterone, estradiol, SHBG, cortisol; TSH; ApoB, lipids, hsCRP; vitamin D, ferritin, fructosamine; kidney and liver markers) from a capillary sample collected at home with the Tasso+ device. Membership includes the kit, lab analysis, results dashboard and an AI coach. Members can skip up to 90 days at a time without charge. HSA/FSA eligible.

What happens after you sign up

Function Health

Testing and insights only. No prescriptions.

Rythm Health

Testing and insights only. No prescriptions.

Cancelling and refunds

Function Health

Terms of Service (last updated 2026-10-07) s.13(b)(ii): cancel before renewal by logging in to my.functionhealth.com, Account Settings, 'Change/Cancel Membership', or by emailing hello@functionhealth.com; cancellation generally takes effect at the end of the billing cycle and access continues until then. s.13(e)(ii): full refund if cancelled within 48 hours of the initial purchase and no specimen has been collected; after that the subscription and all renewals are nonrefundable, with no prorated refund for unused tests. Unused included tests expire at the end of each subscription period (s.13(b)(iii)). FAQ: no pauses; 'Function does not offer refunds for prior payments.'

Rythm Health

FAQ: cancel in the account under Accounts > Billing > 'Cancel Subscription'; results stay accessible but the AI coach ends. Refund and Skip Policy (updated 2025-02-11): cancel via dashboard > account billing > 'Manage Shipping and Payment'; cancellation does not trigger a refund. A '90-day money-back guarantee' applies to the first test only, and only if the sample was collected and returned to the lab and the request is made within 7 days of receiving results. The latest monthly charge can be reversed only if the kit has not yet been prepared to ship. Used kits are not refundable and shipping costs are non-refundable. Terms s.11.2: subscriptions renew automatically each billing period until cancelled.

Where each is available

Function Health

FAQ: offered at 2,000+ Quest labs across 48 states, 'but not yet Rhode Island, Hawai'i, or Puerto Rico'. Pricing footnote: the $365 first-year price applies 'in all states except New York and New Jersey'; FAQ says testing there 'can cost more due to state regulations' (amount not published). Arizona members need two lab visits for the Annual Test. DC not mentioned.

Rythm Health

FAQ: 'Rythm is currently available nationwide across all 50 U.S. states.' Requires a U.S. shipping address FedEx can deliver to and collect from; no international shipping. DC is not mentioned. Footer lists the lab as 'CLEP Permitted' (New York's lab permit program).

Full breakdown of each

#1 Function Health logo

Adults who want twice-yearly broad lab testing at a flat cash price and do not need prescribing or treatment from the same service.

Starting price
$365/yr
Consult model
Unconfirmed
Prescriber
Unconfirmed
Labs
Included
Insurance
Cash pay
Availability
48 states
Cancellation
Self-serve online
Founded
Austin, TX

Pricing

Pricing page (seen 2026-11-05): '$1/day', 'Charged annually at $365'; includes '160+ lab tests annually' across two draws (100+ tests at the annual visit, 60+ tests 3 to 6 months later), clinician review of every result and a personalized protocol. Footnote: the $365 first-year price applies in all states except New York and New Jersey, where testing costs more (amount not stated). Add-on tests and imaging cost extra; the FAQ lists the Annual MRI at $999 for members. Terms s.13(b)(i): the subscription auto-renews at Function's then-current price.

Prices as listed on November 5, 2026. They change often; confirm at checkout.

What we like

  • Core lab panel (160+ tests across two draws per year) included in the $365 annual fee
  • Self-serve cancellation from account settings, documented in the Terms of Service
  • Single published annual price; HSA/FSA eligible
  • Draws at 2,000+ Quest locations or an at-home draw option

Watch out for

  • Does not bill insurance and is not enrolled with Medicare or Medicaid
  • Refund only within 48 hours of purchase and before any specimen is collected; renewals are nonrefundable and there is no pause option
  • Not available in Rhode Island or Hawai'i; NY/NJ testing costs more and the amount is not published
  • Company states it does not offer medical advice or treatment; credentials of the clinicians who review results are not disclosed
Cancelling

Terms of Service (last updated 2026-10-07) s.13(b)(ii): cancel before renewal by logging in to my.functionhealth.com, Account Settings, 'Change/Cancel Membership', or by emailing hello@functionhealth.com; cancellation generally takes effect at the end of the billing cycle and access continues until then. s.13(e)(ii): full refund if cancelled within 48 hours of the initial purchase and no specimen has been collected; after that the subscription and all renewals are nonrefundable, with no prorated refund for unused tests. Unused included tests expire at the end of each subscription period (s.13(b)(iii)). FAQ: no pauses; 'Function does not offer refunds for prior payments.'

Where it is available

FAQ: offered at 2,000+ Quest labs across 48 states, 'but not yet Rhode Island, Hawai'i, or Puerto Rico'. Pricing footnote: the $365 first-year price applies 'in all states except New York and New Jersey'; FAQ says testing there 'can cost more due to state regulations' (amount not published). Arizona members need two lab visits for the Annual Test. DC not mentioned.

#2 Rythm Health logo

People who want to track a short set of hormone, lipid and metabolic markers every month or two from home, and who will take results to their own doctor for any treatment.

Starting price
$79/month
Consult model
Unconfirmed
Prescriber
Unconfirmed
Labs
Included
Insurance
Cash pay
Availability
50 states
Cancellation
Self-serve online
Founded
Unconfirmed

Pricing

Homepage (seen 2026-11-05): '$79/test', billed as a monthly subscription; first kit 30% off at $55.30 under a 'limited time' offer; '+ shipping & tax' with the shipping amount not shown before checkout. Each kit tests 25+ biomarkers (separate men's and women's panels: hormones including total and free testosterone, estradiol, SHBG, cortisol; TSH; ApoB, lipids, hsCRP; vitamin D, ferritin, fructosamine; kidney and liver markers) from a capillary sample collected at home with the Tasso+ device. Membership includes the kit, lab analysis, results dashboard and an AI coach. Members can skip up to 90 days at a time without charge. HSA/FSA eligible.

Prices as listed on November 5, 2026. They change often; confirm at checkout.

What we like

  • Published per-kit price of $79 for repeat testing, with the option to skip up to 90 days between kits
  • Home collection with the Tasso+ device; no lab visit or phlebotomist
  • Self-serve cancellation from the account dashboard
  • Runs its own CLIA-certified, CAP-accredited lab and states availability in all 50 states

Watch out for

  • Panel is small (25+ markers) and differs by sex because of sample volume limits; some markers are dropped if the sample is short or outside stability windows
  • Shipping is charged on top of the $79 price and the amount is not shown before checkout
  • Money-back guarantee covers the first test only and requires a request within 7 days of results
  • No clinician consultation, diagnosis or prescribing; interpretation comes from an AI coach
Cancelling

FAQ: cancel in the account under Accounts > Billing > 'Cancel Subscription'; results stay accessible but the AI coach ends. Refund and Skip Policy (updated 2025-02-11): cancel via dashboard > account billing > 'Manage Shipping and Payment'; cancellation does not trigger a refund. A '90-day money-back guarantee' applies to the first test only, and only if the sample was collected and returned to the lab and the request is made within 7 days of receiving results. The latest monthly charge can be reversed only if the kit has not yet been prepared to ship. Used kits are not refundable and shipping costs are non-refundable. Terms s.11.2: subscriptions renew automatically each billing period until cancelled.

Where it is available

FAQ: 'Rythm is currently available nationwide across all 50 U.S. states.' Requires a U.S. shipping address FedEx can deliver to and collect from; no international shipping. DC is not mentioned. Footer lists the lab as 'CLEP Permitted' (New York's lab permit program).

Function Health vs Rythm Health: common questions

Is Function Health or Rythm Health better?

Function Health ranks higher on our rubric (9.8 vs 9.1 out of 10; * means provisional, and fully verified scores rank first). That reflects price transparency, labs, availability, cancellation terms and treatment range, not clinical outcomes. Function Health: Adults who want twice-yearly broad lab testing at a flat cash price and do not need prescribing or treatment from the same service. Rythm Health: People who want to track a short set of hormone, lipid and metabolic markers every month or two from home, and who will take results to their own doctor for any treatment.

Which is cheaper, Function Health or Rythm Health?

Function Health starts at $365/yr (labs included; more in NY/NJ). Rythm Health starts at $79/month (one at-home test kit per month, plus shipping and tax). Compare what each price includes, especially labs and medication.

Do Function Health and Rythm Health include lab work?

Function Health: included. Rythm Health: included.

Which is easier to cancel?

Function Health: Terms of Service (last updated 2026-10-07) s.13(b)(ii): cancel before renewal by logging in to my.functionhealth.com, Account Settings, 'Change/Cancel Membership', or by emailing hello@functionhealth.com; cancellation generally takes effect at the end of the billing cycle and access continues until then. s.13(e)(ii): full refund if cancelled within 48 hours of the initial purchase and no specimen has been collected; after that the subscription and all renewals are nonrefundable, with no prorated refund for unused tests. Unused included tests expire at the end of each subscription period (s.13(b)(iii)). FAQ: no pauses; 'Function does not offer refunds for prior payments.' Rythm Health: FAQ: cancel in the account under Accounts > Billing > 'Cancel Subscription'; results stay accessible but the AI coach ends. Refund and Skip Policy (updated 2025-02-11): cancel via dashboard > account billing > 'Manage Shipping and Payment'; cancellation does not trigger a refund. A '90-day money-back guarantee' applies to the first test only, and only if the sample was collected and returned to the lab and the request is made within 7 days of receiving results. The latest monthly charge can be reversed only if the kit has not yet been prepared to ship. Used kits are not refundable and shipping costs are non-refundable. Terms s.11.2: subscriptions renew automatically each billing period until cancelled.

Can Function Health or Rythm Health prescribe treatment?

Function Health: no, testing and insights only. Rythm Health: no, testing and insights only.

Which is available in more states?

Function Health: 48 states. Rythm Health: 50 states.

Sources

Regulatory and primary sources

  1. Function Health: Function Health pricing (seen 2026-11-05) ↗
  2. Function Health: Function Health FAQ ↗
  3. Function Health: Function Health Terms of Service (last updated 2026-10-07) ↗
  4. Function Health: Function Health homepage ↗
  5. Function Health: Function Health - Wikipedia ↗
  6. Function Health: Function Health on Trustpilot (read 2026-11-05) ↗
  7. Function Health: Function Health sues Superpower Health (JD Supra; search snippet) ↗
  8. Function Health: Function sues Superpower (Athletech News, 2026-02-05) ↗
  9. Rythm Health: Rythm homepage ↗
  10. Rythm Health: Rythm FAQs ↗
  11. Rythm Health: Rythm Refund and Skip Policy (updated 2025-02-11) ↗
  12. Rythm Health: Rythm Terms and Conditions ↗
  13. Rythm Health: Rythm: What we test ↗
  14. Rythm Health: Laboratory Technician job listing, Omaha NE (search result) ↗
  15. Rythm Health: Rythm Health on Trustpilot ↗
  16. Lindy Health clinic scoring rubric ↗