“I wish I could see millions of patients. We are building Function to democratize so much of what I do and give you the keys to own your health. It is the most powerful approach to health I’ve seen in my career as a doctor.”
Use code MARK2026 as your access code and MARK2026 as your gift code at checkout to unlock your $50 credit.

Not your average checkup
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
This Function Day, invest in health, not stuff.



