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Function Health
Company typePrivate
Founded2021 [1]
Founder
  • Mark Hyman
  • Jonathan Swerdlin
  • Daniel Swerdlin
  • Pranitha Patil
  • Mike Nemke
  • Seth Weisfeld
Headquarters
Austin, Texas
Number of employees
50
Websitefunctionhealth.com

Function Health, often stylized as simply Function, is an American health technology company and platform headquartered in Austin, Texas. The company was co-founded by Mark Hyman, Pranitha Patil, Mike Nemke, Seth Weisfeld, Jonathan Swerdlin and Daniel Swerdlin.[2][3]

The company offers a membership-based health platform with direct-to-consumer blood testing, urine testing (21 tests), for a total of 100+ tests, along with AI-generated reports and cross-promotion of supplements,[4] with an option of adding full-body MRI and CT scans. The company was valued at $2.5 billion in its last financing round in November 2025.[5]

History

[edit]

Function Health was founded in 2021 by Mark Hyman, Pranitha Patil, Mike Nemke, Seth Weisfeld, Jonathan Swerdlin and Daniel Swerdlin.[6]

In 2023, Function Health completed more than three million lab tests.[7] As of 2024, the company had at least 100,000 members and a waitlist of 200,000.[8][9][10] That same year, Hyman stated there were over a million data points on Function Health’s first group of 10,000 people.[11]

In May 2025, Function Health acquired Ezra and planned to add Ezra's MRI scanning technology to its platform.[12][13]

In 2025, Function Health was one of the offerings included in the Academy Awards nominees gift bag.[14] That same year, the company launched a brand campaign for Mother's Day, called "Long Live Moms."[15]

In June 2025, Function Health was named to Time's most influential companies of 2025 list.[16]

Technology

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According to its website, Function Health is not a laboratory or medical provider. All consumers are sent to Quest Diagnostics locations for blood draws, and Quest Diagnostics is the laboratory that performs all tests.[17] All laboratory and medical services are provided by independent third parties. Function Health also states that it does not offer medical advice, diagnosis, or medical treatment.[17]

Function Health operates as a middleman between consumers and existing laboratory services. The company facilitates test ordering and presents results through its platform, but the actual specimen collection, laboratory analysis, and clinical interpretation are performed by other entities. Consumers pay Function Health, which then coordinates services through its network of third-party providers. This business model differs from vertically integrated laboratory services where a single company performs specimen collection, testing, and result delivery.

Fundraising

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Since its founding, the company conducted three seed rounds. In March 2022, the company raised $3 million, with additional rounds in December 2023, and April 2024, although the amount raised during these rounds was unreported.[18]

In June 2024, the company was valued at $191 million following its series A fundraising round of $53 million from Andreessen Horowitz, Wisdom.vc, Draft Ventures, K5 and G9 Ventures, among others.[19][18]

Function Health has received investment from institutions like 53 Stations and Embiid Ventures, as well as individual businesspeople, investors and doctors, including Ari Emanuel, Casey Means, Harvey Spevak, Harpeet Singh Rai and Jeff Dean.[2] The company also has received investment from actors and influencers like Matt Damon, Kevin Hart, Zac Efron, Pedro Pascal and Jay Shetty, and sports figures including Blake Griffin, Colin Kaepernick and Jimmy Rollins.[9][20]

In November 2025, Function Health announced a $298 million Series B financing at a $2.5 billion valuation, led by Redpoint Ventures.[21]

Partnerships

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In May 2024, the company partnered with health club Equinox Group to offer a personalized nutrition, sleep and fitness coaching program, which included lab testing from Function Health.[8][22] The program was developed to help members measure physical and mental performance in relation to their fitness goals.[23][24] In October 2024, the company partnered with Thrive Global, a health technology company founded by Arianna Huffington. The partnership offered a health coaching program to employees.[25]

In December 2024, the company announced its partnership with biotechnology company Grail to provide members with a multi-cancer early detection (MCED) test, or liquid biopsy, that screens for 50 different types of cancers, including the Galleri test, which is a blood-based MCED test developed by GRAIL. The test reviews DNA patterns of different types of cancers before they become symptomatic.[8]

In February 2025, the company announced a partnership with the National Basketball Players Association.[26] The partnership provided NBPA members with access to its lab tests, which Forbes reported is "significantly more" than players receive in their standard medical panels through their teams.[27][28] In April 2025, the company partnered with Thatch, an employer health benefit platform, to offer employees access to preventive diagnostic testing.[29]

Blood draw volume requirement

[edit]

Function Health's testing panel requires a substantial blood draw that may be concerning for some consumers. According to Function Health's FAQ, the service requires "about 35-85 mL depending on the person," collected across two separate visits to Quest Diagnostics locations.[30] Independent reviews suggest the actual volume may be higher, with Health Test Review reporting that each visit pulls around 10-12 vials."[31] Industry sources note that 10 standard blood vials equals approximately 85 mL of blood. This volume requirement, potentially over 85 mL when accounting for both visits, represents a significant draw compared to typical annual physicals. For individuals who are needle-averse, have small veins, or have conditions affecting blood volume, this requirement may present a barrier to participation.

Conflict of interest allegations

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Function Health's co-founder and Chief Medical Officer, Mark Hyman's practice of functional medicine has drawn significant criticism from the scientific and medical communities. An analysis by McGill University's Office for Science and Society characterized his functional medicine as "a slippery slide that moves healthcare providers into alternative medicine," noting that "under the seductive luster of marketing verbiage, its goal is clear: test for as many things as possible and load the patient up with dietary supplements."[4] These critiques raise questions about the scientific foundation underlying Function Health's testing philosophy and recommendations.

Hyman operates a separate supplement business through his website drhyman.com, selling approximately 500 supplement products across 12 pages of offerings.[4] According to McGill University's Office for Science and Society, Hyman "sells just about any dietary supplement you can think of," with supplements "bundled into a confusion of stacks" for various health concerns.[4] Trustpilot has described the cross-promotion of supplements as a major warning sign that calls into question the reliability of recommendations.[32] Critics argue this creates a significant conflict of interest when the company analyzing test results and suggesting supplements has financial ties to supplement sales.

References

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  1. ^ Ostertag, Elizabeth (2025-02-05). "Product of the Week: Function Health". Athletech News. Retrieved 2025-06-22.
  2. ^ a b Chowdhry, Amit (2024-07-06). "Function: Health Assessment Company Raises $53 Million". Pulse 2.0. Retrieved 2025-06-19.
  3. ^ Fedeli, Kristen (2024-01-02). "Function Health COO Pranitha Patil on Preventative Diagnostics". Fitt Insider. Retrieved 2025-06-24.
  4. ^ a b c d Jarry, Jonathan (June 12, 2025). "Functional Medicine Is a Pipeline to Alt Med". McGill University Office for Science and Society.
  5. ^ Park, Kate (2025-11-19). "Function Health raises $298M Series B at $2.5B valuation". TechCrunch. Retrieved 2025-12-12.
  6. ^ Liberatore, Josh (2024-12-24). "Is Aging a Choice? Doctors, Experts See Bright Future for Longevity Science". Athletech News. Retrieved 2025-06-19.
  7. ^ Gupta, Shalene (March 19, 2024). "How Function Health is arming patients with extensive test results". Fast Company. Retrieved June 22, 2025.
  8. ^ a b c Gil, Bruce (Dec 4, 2024). "Function Health Grail Cancer Test". Quartz. Retrieved 2025-06-23.
  9. ^ a b Aquino, Steven. "Function's Dr. Mark Hyman Talks Transparency In Healthcare, New Funding Round, More In Interview". Forbes. Retrieved 2025-06-19.
  10. ^ Maguire, Mia (2025-03-10). "Function Health: A Game-Changer for Accessible, Preventive Healthcare". The Daily Beast. Retrieved 2025-06-23.
  11. ^ Elliot, Bryan (Dec 13, 2023). "Behind the Brand with Dr. Mark Hyman". Inc. Retrieved Jun 27, 2025.
  12. ^ Capoot, Ashley (2025-05-05). "Function Health buys Ezra, launches full-body scan for a third of the price". CNBC. Retrieved 2025-06-22.
  13. ^ Turner, Brock E.W. (May 5, 2025). "Function Health acquires Ezra for MRI body scans". Modern Healthcare. Retrieved 2025-06-22.
  14. ^ Jokic, Natasha (2025-03-01). "Here's What's Inside The $217k Gift Bag For Oscar Nominees This Year". BuzzFeed. Retrieved 2025-06-24.
  15. ^ Navarro, Andrea (2025-04-28). "Function Health Launches First Brand Campaign, "Long Live Moms," Ahead of Mother's Day". Athletech News. Retrieved 2025-06-27.
  16. ^ Haupt, Angela (2025-06-26). "TIME100 Most Influential Companies 2025: Function Health". TIME. Retrieved 2025-06-27.
  17. ^ a b "How It Works". Function Health. Retrieved December 24, 2025.
  18. ^ a b "How Much Did Function Health Raise? Funding & Key Investors | Clay". www.clay.com. Retrieved 2025-06-19.
  19. ^ Bradbury, Rosie (2025-02-19). "Redpoint-led round values longevity startup Function Health at $2.5B". PitchBook. Retrieved 2025-06-19.
  20. ^ Haupt, Angela (2024-12-04). "What Getting 105 Blood Tests From a Health Startup Taught Me". TIME. Retrieved 2025-06-19.
  21. ^ Park, Kate (2025-11-19). "Function Health raises $298M Series B at $2.5B valuation". TechCrunch. Retrieved 2025-12-12.
  22. ^ Smith, Dana G. (2024-05-07). "Could Equinox's New $40,000 Membership Really Help You Live Longer?". The New York Times. ISSN 0362-4331. Retrieved 2025-06-23.
  23. ^ Greenfield, Beth. "Equinox is offering a $40,000 a year personalized wellness program to help you live longer. Here's what it includes". Fortune Well. Retrieved 2025-06-27.
  24. ^ Cerullo, Megan (2024-05-06). "Equinox's new fitness program aims to help you live longer — for $40,000 - CBS News". www.cbsnews.com. Retrieved 2025-06-27.
  25. ^ Paulise, Luciana. "AI-Powered Wellness: Thrive Global And Function Health's New Synergy". Forbes. Retrieved 2025-06-24.
  26. ^ Knight, Jacob (Feb 5, 2025). "Function Health Partners with NBPA to Revolutionize Athlete Health". Connect The Watts. Retrieved June 23, 2025.
  27. ^ M.D, Brook Choulet. "How The National Basketball Players Association Is Prioritizing Athlete Health". Forbes. Retrieved 2025-06-24.
  28. ^ Pennic, Fred (2025-02-05). "NBA Players Gain Access to Advanced Biomarker Testing Through NBPA/Function Health Partnership". Retrieved 2025-06-24.
  29. ^ Rehfeldt, Courtney (2025-04-30). "Thatch Launches Curated Health Marketplace, Teams With Function Health". Athletech News. Retrieved 2025-06-24.
  30. ^ "FAQ". Function Health. Retrieved December 24, 2025.
  31. ^ "Function Health Review – An In-Depth Look at the Blood Testing Service". Health Test Review. June 16, 2025.
  32. ^ "Function Health Reviews". Trustpilot. Retrieved December 24, 2025.
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