Dr. Tiffany Lester

Tiffany Lester, M.D., is the women’s health medical director at Function, serving alongside Chief Medical Officer Mark Hyman. A board-certified integrative medicine physician, she brings nearly a decade of leadership experience as a national medical director, educator, and advocate for women’s health equity.

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At Function, Dr. Lester leads the clinical strategy for women’s health, translating cutting-edge biomarker science into personalized, practical protocols that empower women to understand and improve their health at every stage of life. She works closely with Dr. Hyman and the clinical team to ensure that women’s health is not siloed but integrated into the core of Function’s mission.

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Beyond her work at Function, Dr. Lester is a sought-after educator and speaker. She has served as visiting faculty at the Institute for Integrative Nutrition, consulted for leading wellness brands like Beekeeper’s Naturals and Metagenics, and contributed to media outlets including O Magazine, Essence, The Huffington Post, MindBodyGreen, and Well+Good.

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Her expertise spans autoimmune conditions, hormone imbalances, gut health, and the intersection of trauma and chronic disease, with a focus on how these uniquely affect women both physically and psychologically. Dr. Lester is committed to closing gaps in care and representation, championing a future where women have access to the same tools, insights, and personalized roadmaps as men.