Function Day

October 7-8

Function Day $365

$1 /day to unlock what’s possible with code FUNCTIONDAY

Terms and conditions apply.*Offer expires at 3:00 AM EST on 10/09/2025. Cannot  be applied to past purchases. Subscription will automatically renew annually at non-promotional rate (currently $499), until cancelled.

A membership built for 100 healthy years

100+ lab tests yearly

Start with over 100 advanced lab tests, followed by a 60+ test follow-up after 3-6 months, it’s 5x more lab testing than the average physical.

Full-body testing

Help detect thousands of diseases—cardiovascular, metabolic, hormonal, neurological, and more

Deep, clinician-guided insights

Get data-driven insights from the world’s top doctors based on your unique results.

Tracked over time

Reveal how your body changes with 2x yearly testing. An all-in-one secure platform for lifelong health.

Test your levels

Live 100 healthy years.

Oct 7—8 only, new members get special access to Function’s full membership. Use code: FUNCTIONDAY
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Apply it twice—once as your access code, once as your gift code—at checkout to activate your discount.

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When the clock runs out, so does the offer. Health doesn’t wait. Neither should you.

Test your levels

100+ lab tests

Advanced imaging (additional fees apply)

Tracked over time

Medical & Scientific Advisory Board includes

Mark Hyman, M.D.

Former Cleveland Clinic physician, 15x NY Times best-selling author, co-founder and Chief Medical Officer of Function Health.

Azra Raza, M.D.

Professor of Medicine at Columbia University, medical oncology specialist.

Daniel Sodickson, M.D., PhD

Chief of Innovation and Professor of Radiology at NYU Medical School, pioneered parallel MRI and AI-driven imaging technology.

Toby Cosgrove, M.D.

Former CEO of Cleveland Clinic, globally-recognized leading heart surgeon.

Andrew Huberman, PhD

Professor of Neurobiology at Stanford School of Medicine and host of the Huberman Lab podcast.

Eddie Chang, M.D.

Professor and Chair of Neurological Surgery at UCSF, internationally recognized neuroscientist.

JoAnn E. Manson, M.D., MPH, DrPH

Chief of Preventive Medicine at Brigham and Women’s Hospital, Professor at Harvard Medical School.

Luis A. Diaz, M.D

Head of the Division of Solid Tumor Oncology at Memorial Sloan Kettering Cancer Center, and leader in cancer genetics.

Yves Michel Duroseau, M.D.

Chair of the Department of Emergency Medicine at Lenox Hill Hospital.

Testing is easy

Step 1

Quick booking

Secure a time slot at any of Quest Labs 2,000+ locations across the US.

Step 2

15 minute lab visits

Function includes two short annual lab visits to test 100+ biomarkers.

Step 3

Take action. Test again.

Turn your results into actionable insights with expert review, then test again.

Join hundreds of thousands
taking charge of their health

I learned through my participation with Function that I have CLL. I am now under the care of MD Anderson Cancer Center for my form of Leukemia.

Function is a blessing to my life. If I had Function earlier in my life, I would not have struggled with PCOS, IBS, and food sensitivities for as long as I did. I am SO excited to have this moving forward. I feel relieved, empowered, and inspired. Thank you Function team!

With my test results, I was able to identify several markers in need of improvement. With addition of many of the supplements listed, I was able to reduce my mercury from 25 to 16 in less than 2 months. I was able to order the mercury test individually for a very reasonable price, which allowed me to monitor the efforts I have been putting in to reduce that marker.

Finding and using Function Health may have been life saving. I had no idea, but I may be dealing with a serious cardiovascular concern that's related to my family history. I thought I was healthy and fit and didn't have to worry. I'm really glad I did this and now have the opportunity to make changes before it's too late. Thank you!

Based on my cardiovascular history, I found very useful to know how my body is improving on the ApoB and LDL biomarkers, as well as my biological age: from -13 years to -15 years, based on the Action Plan you recommended.

Thank you for all you are doing for chronically ill patients like me! This has already saved me thousands of dollars in lab costs. My other medical dr bills, meds & tests are already at $4,000 towards our deductible so this savings is a big help!

Thank you so much for all the work you put into this company. I wish I had this years ago when I was struggling with conventional medical practitioners. I believe this company is the future! Much love to your team.

Function detailed labs provide valuable information that allows me to control my health. It will be valuable to have insight on how to make lifestyle changes that would help correct the areas that need improvement.

I am so impressed. I texted on a holiday Sunday about my period starting/rescheduling bloodwork and I got an answer within 5 minutes. Plus help scheduling. I’m impressed with the lab info so far. I really love this more than I thought I would.

I appreciate the detailed feedback regarding the test results... food, supplements, causes and whys. It makes understanding my health and making smart choices easier. - Mother of 4 in Kansas