Equinox members get Function for $249/year.*

Unlock your exclusive Equinox member rate. 160+ advanced lab tests. Track the proof behind your training, from heart and hormones to immunity and more.

You say you’re at the apex of performance.

Prove it.

*Regularly $365/year. Offer powered by Equinox. Open up your EQX+ App and navigate to Equinox Circle to redeem this offer.

Claim now

Testing is easy

01

100+ lab tests

Schedule at 2k+ Quest Diagnostics locations
02

Results explained

By top doctors and 1000s of hours of research

03

Follow your protocol

 Take action. Test again.

Real people. Real results.

Function like Aimee
The cancer signals doctors missed
Function like Alan
From diabetes diagnosis to action
Function like Geoff
Finding prostate cancer after testing
Function like Catherine
You can't diet or exercise this away

The new standard for health

Health for a new, discerning generation
“I’ve been so impressed 
by Function.”
andrew
huberman
"I deeply believe in Function's mission."
Jay
Shetty
"Function helps me understand my own biology."
baya
voce
"Helped me finally identify imbalances and optimize my hormones."
Mari

Llewellyn

Built with the world's top doctors

Function’s Medical & Scientific Board
JoAnn E. Manson, M.D., MPH, DrPH

Chief of Preventive Medicine at Brigham & Women’s Hospital. Professor at Harvard

Andrew Huberman, PhD

Professor of Neurobiology at Stanford School of Medicine

Toby Cosgrove, M.D.

Former CEO of Cleveland Clinic. Top heart surgeon.

Daniel Sodickson, M.D., PhD

Chief of Innovation at NYU Langone. Pioneer of AI-driven MRI.

Azra Raza, M.D.

Top medical oncologist. Professor at Columbia University.

Eddie Chang, M.D.

Professor & Chair of Neurological Surgery at UCSF.

Luis A. Diaz, M.D.

Head of the Division of Solid Tumor Oncology at Memorial Sloan Kettering Cancer Center.

Mark Hyman, M.D.

Former Cleveland Clinic physician. CMO of Function Health.

Frequently asked questions

Who should I gift a Function membership to?

Anyone who wants to take control of their health—or needs a reason to start.

Give it to:

  • Your partner who always says "I'm fine"
  • An aging parent who wants insight into their changing body
  • Your adult kids, as an investment into their future
  • A caregiver who struggles to put themselves first
  • A friend who has just started prioritizing their health A Function membership is more than thoughtful. It can be a powerful wake-up call, starting point, or vote of confidence for someone you love.
Why are we called "Function"?

Your body, mind, and healthcare system should function. But corrupted food systems, chronic stress, and outdated practices can push you toward dysfunction. We exist to change that. We give you insights across your body—heart, hormones, thyroid, nutrients, toxins, inflammation, and more—so you can stay in control.

Can an employer pay for employees’ Function memberships?

Yes. Employers can fully or partially fund Function memberships as an employee wellness benefit.

How does Function work for employees across different locations?

Function is available in most states through Quest, allowing employees to schedule tests where it’s most convenient.

What is a biomarker?

Biomarkers are measurable signals in your body—like a hormone, protein, or vital sign—that can reflect shifts in your health even before symptoms show up. For example, elevated Apolipoprotein B levels can be linked to increased heart disease risk. Tracking biomarkers helps you spot changes early, so you can take action sooner.

What kind of reporting can we expect?

You’ll get detailed reports* on enrollment, engagement, test completion, biomarker trends, and overall population health, so you can track impact over time. *This data is aggregated and de-identified for privacy.