Ferritin
Below range 11 ng/mL
160+ lab tests
Total each year
Whole body
Tested 2x per year
$1 per day
$365 per year
Get better answers with better inputs
You can securely connect your Function results to ChatGPT Health, Claude, Perplexity, and more. The same questions, but with more informed and relevant responses.
Why am I so tired all the time?
There are many possible explanations for fatigue. Without more context, here are some common ones:
- Poor sleep hygiene
- Stress or anxiety
- Nutritional deficiencies (iron, vitamin D, B12)
- Thyroid dysfunction
- Dehydration
- Lack of physical activity
- Chronic conditions like anemia or diabetes
It's hard to narrow this down without knowing more about your health. Bloodwork could help pinpoint what's actually going on...
Function results
Synced
Why am I so tired all the time?
Fatigue has a lot of possible causes, but your Function results point to a few things worth looking at closely:
TSH (Thyroid-Stimulating Hormone)
Above range 5.1 mIU/L
What can I eat to help raise my ferritin? What supplements should I consider taking? Prep me for a doctor visit
Monitor early indicators of 1000s of diseases
Establish your long-term baseline
Tracked for life
Monitor how your body changes
AnemiaGoutCeliac diseaseAddison's diseaseInsulin resistanceFatty liver diseasePancreatic cancerOvarian cancerSickle cell diseaseSjögren's syndromeDiabetesRheumatoid arthritisMold toxicity
HypogonadismLupusCoronary artery diseaseHypothyroidismAlzheimer's diseaseHemochromatosisPCOSChronic kidney diseaseHashimoto's thyroiditisProstate cancerLead toxicityGraves' disease
The new standard for health
Health for a new, discerning generation
"I recommend Function for every woman, every year of her life."
Dr. Jen Ashton
“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
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 testing, on your schedule
Labs trusted by the medical community. Test at 2000+ Quest locations nationwide, or schedule an at-home blood draw with a licensed specialist.
Over 75 million results delivered to Function members
75M+
75M+
2,000+ lab test locations across the US
2,000+
2,000+
Or we’ll come to you—have a licensed specialist come to your home or office.
Not your average checkup
Standard checkup
160+
Lab tests annually
~26
Personalized action plan
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 MRI & CT
Access to Galleri® Multi-Cancer Test
Access to Alzheimers & brain testing
Access to mold reactivity testing
Standard checkup
Lab tests annually
160+
~26
Personalized action plan
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 MRI & CT
Access to Galleri® Multi-Cancer Test
Access to Alzheimers & brain testing
Access to mold reactivity testing
Built with the world's top doctors
Function’s Medical & Scientific Board
Mark Hyman, M.D.
Former Cleveland Clinic physician. Co-founder and chief medical officer of Function.
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
Former chief of innovation in radiology at NYU Langone. Pioneer of AI-driven MRI. Chief medical scientist at Function.
Azra Raza, M.D.
Top medical oncologist. Professor at Columbia University.
Eddie Chang, M.D.
Professor and 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.
Yves Michel Duroseau, M.D.
Chair of the Department of Emergency Medicine at Lenox Hill Hospital.
Jordan Shlain, M.D.
Primary care physician. Founder and chairman of Private Medical.
Jen Ashton, M.D., M.S.
Double board-certified in OBGYN and Obesity Medicine; MS in Nutrition.
What could cost you $15,000 is $365
Your health shouldn’t depend on insurance.
- 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 MRI and CT anytime
- No insurance, transparent pricing
Function blows my mind. The experience, price, and clinician notes are all phenomenal.
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.