Dr. Mark Stengler is a Naturopathic Medical Doctor whose training bridges conventional medicine and evidence-based natural therapies. With nearly thirty years in private practice, he has guided tens of thousands of patients toward better health through integrative and naturopathic medicine.

Dr. Stengler has been recognized among the most distinguished practitioners in his field, receiving the 2021 Doctor of the Decade award and the 2025 Top Holistic Doctor of the Year designation from the International Association of Top Professionals. He has also served on a medical advisory committee for the Yale University Complementary Medicine Outcomes Research Project.

A prolific author and educator, Dr. Stengler has written or co-authored more than 20 books, including the bestselling Prescription for Natural Cures, Outside the Box Cancer Therapies, and Healing the Prostate. His most recent work, The Holistic Guide to Gut Health: Discover the Truth About Leaky Gut, Balancing Your Microbiome, and Restoring Whole-Body Health, reflects his commitment to translating cutting-edge science for everyday readers. His research has appeared in peer-reviewed publications including the International Journal of Family & Community Medicine, Endocrinology & Metabolism International Journal, Journal of Nutritional Health & Food Engineering, and Alternative Therapies in Health and Medicine. He also reaches a broad public audience through his weekly online newsletter, Dr. Stengler's Health Breakthroughs.

Dr. Stengler holds a Doctorate of Naturopathic Medicine, a Doctor of Health Sciences (DHSc), and a Master of Science in Human Biology. His additional academic credentials include a Master of Religious Studies, a Bachelor of Arts in Liberal Arts, a certificate in Advanced Metabolic Endocrinology from The Metabolic Medical Institute, and coursework in Logic and Reasoning from Oxford University.

His medical training encompassed a full standard curriculum — including diagnosis, laboratory testing, pharmacology— alongside advanced integrative disciplines: bio-identical hormone therapy, intravenous nutrient therapy, chelation therapy, ozone therapy, clinical nutrition, nutritional supplementation, Chinese medicine, botanical medicine, psychology, counseling, and pharmacogenomics.

Dr. Stengler practices alongside his wife, Dr. Angela Stengler, at the Stengler Center for Integrative Medicine in Encinitas, California.