Mark Hyman

Mark Adam Hyman was born on November 22, 1959. He graduated from Cornell University with a BA in Asian Studies and earned his MD from the University of Ottawa School of Medicine, completing family medicine training at Community Hospital of Santa Rosa, California. He began his career as a family physician in rural Idaho and later worked as an emergency medicine physician in Massachusetts.

From 1996 to 2004, Hyman served as co-medical director at Canyon Ranch in Lenox, Massachusetts, a luxury wellness resort. After leaving Canyon Ranch, he founded The UltraWellness Center in Lenox, which became the institutional home for his functional medicine practice. He published a rapid succession of bestselling books — including The UltraMind Solution, The Blood Sugar Solution, and the 10-Day Detox Diet — each promoting variants of the same functional medicine framework: that conventional medicine ignores the 'root causes' of disease, which are identified through expensive panels of testing and addressed through dietary overhaul, supplements, and detox protocols.

In 2014, Hyman made a high-profile move, founding the Center for Functional Medicine at the Cleveland Clinic — one of the most respected hospital systems in the United States. Science-Based Medicine and Respectful Insolence published extensive criticisms of the arrangement, arguing that the Cleveland Clinic had lent its prestigious brand to an evidence-free practice. The American Academy of Family Physicians had already evaluated functional medicine and found its evidence base lacking and some treatments harmful. A 2019 Cleveland Clinic study purporting to demonstrate functional medicine benefits was criticized for methodological flaws.

Hyman's public advocacy has included collaboration with Gwyneth Paltrow's Goop platform — producing content on heavy metal detoxification that Science-Based Medicine characterized as 'fear mongering' built on unvalidated diagnostic tests (chelation challenge testing, which the FDA considers clinically invalid) and discredited treatments. He left the Cleveland Clinic director position in 2023.

Hyman co-founded Function Health in 2021, a membership-based direct-to-consumer lab testing company. He remains a prolific media presence with millions of social media followers, a major podcast (The Dr. Hyman Show), and consistent bestseller list appearances. His primary professional trajectory — from family physician to supplement-selling functional medicine entrepreneur — represents the commercialization of alternative medicine under the legitimizing umbrella of a genuine MD.

“Heavy metal toxicity causes obesity, ADHD, autism, Alzheimer's, Parkinson's, and a wide range of chronic diseases, and detoxification programs remove these toxins to restore health.”

Hyman overstates the scientific evidence for heavy metal toxicity as a driver of these conditions. Systematic reviews find no compelling clinical evidence that detox programs remove meaningful quantities of exogenous toxins or produce sustained health benefits. Apparent short-term benefits are attributed to calorie restriction, water loss, and placebo effects.

“The chelation challenge test is a valid diagnostic tool for identifying toxic heavy metal burden.”

The FDA has specifically stated that the chelation challenge test (provoked urine testing) is not clinically valid as a diagnostic tool. Hyman promotes this test as a functional medicine assessment, which critics say leads to false-positive heavy metal diagnoses and unnecessary (and potentially harmful) chelation treatments.

“Functional medicine addresses the 'root causes' of disease through comprehensive lifestyle, dietary, and supplement protocols that conventional medicine ignores.”

The American Academy of Family Physicians evaluated functional medicine and found it lacking in evidence, with some treatments characterized as harmful. A 2019 Cleveland Clinic study claiming to demonstrate functional medicine benefits was criticized by Science-Based Medicine for methodological flaws that made it unable to support its conclusions.