Which costs less, Function Health or SiPhox Health?

It depends on how often you test. Function Health charges $365 a year, billed annually and covering the year's testing. SiPhox Health charges $125 per membership testing period, with cadences of monthly, quarterly, or every six months, so the annual figure moves with your schedule rather than being fixed.

Which tests more biomarkers, Function Health or SiPhox Health?

Function Health publishes the larger number, at 160+ lab tests annually. SiPhox Health publishes per-panel counts: 29 on Longevity Essentials, up to 59 on Ultimate 360, with Heart & Metabolic at 26 and Thyroid Focus at 21. The two count on different bases, so read them as scope rather than as a straight subtraction.

Does Function Health or SiPhox Health include a doctor consultation?

Neither sells a scheduled consultation as the core of the membership. Function Health's results are explained by physicians and researchers, without an on-demand care team. SiPhox Health provides personalized insights, 1:1 health coaching, and an AI assistant, while directing members to their own physician for a formal interpretation of the results.

Is Function Health better than SiPhox Health?

It depends on what you want from a panel. Function Health suits a wide annual survey, 160+ lab tests annually on scheduled venous draws, if a needle is no obstacle. SiPhox Health suits frequent readings of a focused panel collected at home with no needles or finger pricks. Breadth against frequency is the real trade-off.

Are Function Health and SiPhox Health HSA/FSA eligible?

Both are. Function Health lists its membership as HSA/FSA eligible, and so does SiPhox Health for its membership testing periods. Pre-tax dollars apply either way, subject to your own plan's rules.

Function Health vs SiPhox Health: Features & Pricing (2026)

Q: How fast do results arrive from Function Health and SiPhox Health?

Function Health publishes the shorter window: a first batch of results typically starts arriving within 48 hours of testing. SiPhox Health publishes a turnaround of 7-10 days from sample to results.

Key takeaway:

Function Health and SiPhox Health diverge first on how the blood is collected. Function Health schedules a venous draw twice a year, at home or at 2,000+ lab locations, and returns 160+ lab tests for $365 a year. SiPhox Health collects at home with a needle-free upper-arm device at $125 per testing period, covering 29 biomarkers on Longevity Essentials, or up to 59 on Ultimate 360. However, if you want the support to continue after the results, Superpower is $349 a year and pairs a personalized action plan — the kind that helped 36.3% of members reduce their biological age score between their first and second year — with on-demand care-team messaging between tests.

How do Function Health and SiPhox Health compare?

Function Health runs testing twice a year and on demand, at home or at 2,000+ lab locations, while SiPhox Health collects at home with an EasyDraw upper-arm device that involves no needles and no finger pricks. The split starts at the sample. Most of the rest follows from that one choice. Function Health's year is organized around scheduled draws that return 160+ lab tests annually for $365 a year. SiPhox Health's is organized around a testing period you pick, at $125 per membership testing period, covering 29 biomarkers on Longevity Essentials or up to 59 on Ultimate 360. So the decision is really about breadth against frequency: a wide annual read on a fixed calendar, or a narrower one you can repeat as often as you like.

Does Function Health use two scheduled draws a year, or does SiPhox Health use a needle-free device?

Function Health uses a conventional venous draw and gives you two ways to give it. Collection happens at home or at 2,000+ lab locations, and the membership schedules it twice a year with on-demand testing in between, so a phlebotomist and a needle are part of the process either way.

SiPhox Health removes both. Its EasyDraw upper-arm device collects the sample at home with no needles and no finger pricks, and there is no lab visit and no appointment at any point in the process.

For someone deciding, this is a friction question, and friction is what stops testing from happening. If needles are the reason your last panel never got booked, a device that sits on your arm removes the objection entirely. If you are unbothered by a draw, Function Health's model costs you an appointment and hands collection to a professional, which is exactly what some people want when the panel is large and the stakes feel high.

How many biomarkers does each membership test, Function Health's or SiPhox Health's, in 2026?

Function Health publishes the bigger number, and publishes it as lab tests rather than biomarkers: 160+ lab tests annually, spread across the body rather than concentrated in one system.

	Function Health	SiPhox Health
Panel breakdown	—	Heart & Metabolic at 26, Thyroid Focus at 21, Hormone Focus at 14
Upgrade cost	—	Widen to Ultimate 360 for an added $125

What are the official 2026 membership prices for Function Health and SiPhox Health?

Function Health charges $365 a year, marketed as a dollar a day and billed annually, and that fee is prepaid access to the full 160+ lab tests for the year.

Function Health: Function Health's annual fee is HSA/FSA eligible, so pre-tax dollars apply.
SiPhox Health: charges $125 per membership testing period on a cadence of monthly, quarterly, or every six months, so the annual outlay depends on how often you decide to test; the Ultimate 360 upgrade adds $125, and a GLP monitoring panel adds $75; SiPhox Health's testing periods are HSA/FSA eligible too.

What happens after your results at Function Health and SiPhox Health, and how fast do they arrive?

Function Health's first results typically arrive within 48 hours; SiPhox Health's take 7-10 days. The wait is where these two diverge most sharply after collection. Function Health says a first batch of results typically starts arriving within 48 hours of testing. SiPhox Health publishes a turnaround of 7-10 days from sample to results.

What lands at the end of that wait differs too. Function Health's results are explained by physicians and researchers, and the membership does not include an on-demand care team. SiPhox Health pairs the numbers with personalized insights, 1:1 health coaching, and an AI assistant, while telling members its dashboard ranges and insights are not medical advice and that a formal interpretation should come from their own physician.

Both also put a number on your aging with a biological age test. Function Health includes one in the membership, run twice a year, derived from Phenotypic Age. SiPhox Health includes BioAge plus a Heart & Metabolic Age score. On supplements, Function Health has folded in SuppCo, now part of Function, connecting supplement guidance to your biomarker data, while SiPhox Health provides personalized supplement and lifestyle recommendations. Neither company prescribes: Function Health does not offer prescriptions, and SiPhox Health's GLP panel is a testing add-on that monitors someone already on a medication rather than supplying one.

Test 150+ biomarkers

Two blood draws a year. Get a full picture of your health and the action plan you need to improve it.

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Test 150+ biomarkers

Two blood draws a year. Get a full picture of your health and the action plan you need to improve it.

Book your test

Who is Function Health best for, and who is SiPhox Health best for?

Function Health is best for:

Someone who wants the widest annual survey, 160+ lab tests, and is comfortable with a venous draw.
Someone who wants results quickly, with a first batch typically arriving within 48 hours of testing.

SiPhox Health is best for:

Someone who would rather not sit for a needle, and wants the sample collected at home with an upper-arm device.
Someone who would rather read a focused panel often, as often as monthly, than a large one twice a year.

The bottom line: does Function Health or SiPhox Health fit you?

Choose Function Health for breadth on a calendar, and SiPhox Health for frequency without a needle. Function Health and SiPhox Health are selling two different rhythms. Function Health is a $365-a-year membership built on scheduled venous draws, 160+ lab tests, and results that start arriving within 48 hours, explained by physicians and researchers. SiPhox Health is needle-free at-home collection at $125 per testing period, 29 biomarkers on Longevity Essentials or up to 59 on Ultimate 360, results in 7-10 days, with coaching and an AI assistant after the results.

Superpower: recommendations you can act on without shopping elsewhere

Both of those end at a recommendation you then go and fulfil. Function Health's $365 a year returns 160+ lab tests across two scheduled draws, interpreted by physicians and researchers, with member chat that explains a biomarker but stops short of medical advice. SiPhox Health's $125 per testing period returns a needle-free panel of 29 biomarkers, or up to 59 on Ultimate 360, read by an AI assistant, with 1:1 coaching sold as an optional add-on. Whatever either one recommends, you buy somewhere else. Superpower is $349 a year, flat and all-in, and closes that gap: 150+ health metrics across two draws, a personalized action plan written from them, a supplement marketplace with member-exclusive pricing to work through it, and prescriptions through the same marketplace when clinically appropriate, priced separately, with a 24/7 care team included rather than sold beside the plan. 93% of members rated their Superpower Health Action Plan as more useful or even life-changing than their yearly checkup.

The hard part was never getting the list. Start your health journey with Superpower and work through it in the same place you got it.