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Your hair wants
your attention

Internal shifts in nutrients, hormones, stress, and inflammation drive hair loss. Function’s 160+ tests reveal what’s really going on.
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Hair loss?
Find the root cause.

Hair loss is driven by measurable shifts in your hormones, nutrients, and inflammation. Function’s 160+ biomarker testing reveals the root cause so you can take action with confidence.

Start testing

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.
Start testingSee how it works

Monitor early indicators of 1000s of diseases

Establish your long-term baseline

Establish your long-term baseline

Tracked for life

Tracked for life

Monitor how your body changes

Monitor how your body changes

Hemochromatosis
Addison’s disease
Insulin resistance
Sickle cell disease
PCOS
Lead toxicity
Celiac disease
Rheumatoid arthritis
Hypothyroidism
Ovarian cancer
Graves’ disease
Prostate cancer
Hashimoto’s thyroiditis
Coronary artery disease
Sjögren’s syndrome
Pancreatic cancer
Alzheimer’s disease
Gout
Mold toxicity
Hypogonadism
Lupus
Fatty liver disease
Diabetes
Chronic kidney disease
Anemia
Coronary artery disease
Pancreatic cancer
Rheumatoid arthritis
Insulin resistance
Ovarian cancer
Lupus
Chronic kidney disease
Lead toxicity
Hypothyroidism
Gout
Hemochromatosis
Alzheimer’s disease
Addison’s disease
Mold toxicity
Fatty liver disease
Sickle cell disease
Sjögren’s syndrome
Prostate cancer
PCOS
Hashimoto’s thyroiditis
Diabetes
Celiac disease
Graves’ disease
Hypogonadism
Anemia
Anemia
PCOS
Insulin resistance
Mold toxicity
Graves’ disease
Pancreatic cancer
Hypothyroidism
Gout
Coronary artery disease
Sickle cell disease
Hypogonadism
Rheumatoid arthritis
Diabetes
Hemochromatosis
Prostate cancer
Lead toxicity
Hashimoto’s thyroiditis
Addison’s disease
Lupus
Fatty liver disease
Chronic kidney disease
Ovarian cancer
Sjögren’s syndrome
Celiac disease
Alzheimer’s disease
Hypothyroidism
Gout
Mold toxicity
Hemochromatosis
Pancreatic cancer
Insulin resistance
Sickle cell disease
Rheumatoid arthritis
Anemia
Fatty liver disease
Hashimoto’s thyroiditis
Coronary artery disease
Hypogonadism
Lupus
Alzheimer’s disease
Graves’ disease
Addison’s disease
Prostate cancer
Sjögren’s syndrome
Ovarian cancer
Celiac disease
Chronic kidney disease
PCOS
Diabetes
Lead toxicity
Insulin resistance
Ovarian cancer
Graves’ disease
Alzheimer’s disease
Sickle cell disease
Hashimoto’s thyroiditis
PCOS
Hemochromatosis
Sjögren’s syndrome
Fatty liver disease
Chronic kidney disease
Rheumatoid arthritis
Lead toxicity
Mold toxicity
Gout
Pancreatic cancer
Hypothyroidism
Hypogonadism
Prostate cancer
Lupus
Anemia
Celiac disease
Addison’s disease
Coronary artery disease
Diabetes
Lead toxicity
PCOS
Hypothyroidism
Anemia
Ovarian cancer
Addison’s disease
Prostate cancer
Diabetes
Lupus
Celiac disease
Fatty liver disease
Alzheimer’s disease
Insulin resistance
Hemochromatosis
Coronary artery disease
Hypogonadism
Graves’ disease
Rheumatoid arthritis
Pancreatic cancer
Mold toxicity
Hashimoto’s thyroiditis
Sjögren’s syndrome
Gout
Sickle cell disease
Chronic kidney disease
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100+ lab tests chosen by top doctors

“The most powerful approach I’ve seen in my career. Uncompromising depth with no shortcuts.”

Mark Hyman, M.D.
Mark Hyman, M.D.
Former Cleveland Clinic physician

Hormones
& thyroid

16 Biomarkers
Thyroxine (T4) Free
Thyroglobulin Antibodies (TgAb)
Testosterone, Total
Anti-Mullerian Hormone
Estradiol

Cancer & other
silent risks

34 Biomarkers
GRAIL Cancer Test
Prostate Specific Antigen (PSA), Total
Rheumatoid Factor (RF)
Mercury
Lead

Heart
& metabolic

18 Biomarkers
LDL Small
Lipoprotein (a)
Apolipoprotein B (ApoB)
Omega-3 Total
Insulin
Omega-6 Total

Aging

26 Biomarkers
Sex Hormone Binding Globulin (SHBG)
DHEA-Sulfate
Insulin-like Growth Factor (IGF-1)
Homocysteine
Vitamin D
Platelet Count

Mental health
& focus

36 Biomarkers
Cortisol
High-Sensitivity C-Reactive Protein (hs-CRP)
Iron
Ferritin
Methylmalonic Acid (MMA) (B12 Proxy)
MTHFR, DNA

+More
‍
All-in-one
lab testing

See all tests

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

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

Gold standard
for lab testing

Labs trusted by the medical community. No startup labs. No unreliable at-home blood draws.

2,000+ lab test locations across the US

2,000
2k

50+ million results delivered to Function members

50M+

Not your average checkup

Personalized Protocol

Upload past results

No insurance needed

Every 6 months

Hormones & fertility testing

Heavy metal & toxin testing

Metabolic & pancreatic testing

Heart testing beyond cholesterol

Nutrient/electrolyte testing

Autoimmunity testing

Thyroid testing

Access to advanced MRI & CT

Access to GRAIL cancer test

Access to Alzheimers & brain testing

Access to mold reactivity testing

Standard checkup

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.

What could cost you $15,000 is $499

Your health shouldn’t depend on insurance.
HSA/FSA Eligible

Function membership

$42

/day
Charged annually at $499
Join Function
160+ lab tests annually
Testing 2x/year and on-demand
Insights from top doctors and researchers
All-in-one for your whole body
Tracked in one secure place
Clinicians review every result and flag issues
Personalized protocol for instant action
Add advanced MRI and CT scans anytime
No insurance, transparent pricing
Join Function

This is the most comprehensive lab testing I have ever had. I am thrilled to know more about my health and how to improve it.

Best money I have spent on healthcare.

Function blows my mind. The experience, price, and clinician notes are all phenomenal.