Skin & Hair Genetic Test
Understand genetic tendencies connected to nutrient pathways, skin resilience, and hair vitality.
Explore the Genetic Test
Explore three ways to personalize your skin and hair treatments.
Each stands on its own—or use them together as a connected path to more personalized skin and hair wellness. Designed primarily for clinicians, aestheticians, nutritionists, and wellness practitioners—with clear, accessible guidance for beauty-conscious consumers.
Find your starting pointChoose what fits today.
There is no required order. Start with what fits your goals today, then add another resource whenever it becomes useful.
Professional Online Training Course
Build a practical foundation in personalized skin nutrition, assessment, testing, topicals, and regenerative science in seven focused hours.
Explore the CourseFeed Your Skin Right
Use Dr. Mark Tager’s practical guide to connect nutrition, lifestyle, and personalized choices with radiant skin.
Explore the BookUse each resource on its own—or combine them.The book builds understanding. The test adds personal genetic context. The course helps professionals put personalized skin nutrition into practice.
Physician, educator, author, and creator of Inside Skin Beauty.
Meet Mark J. Tager, MD, creator of Inside Skin Beauty.
Physician, educator, and author connecting personal biology with nutrition, lifestyle, supplementation, and skin and hair care.
Meet Dr. Tager
Dr. Mark Tager is a physician, educator, and entrepreneur who bridges the worlds of functional, regenerative, and aesthetic medicine. As CEO of ChangeWell Inc., he trains clinicians to build thriving, patient-centered practices that integrate internal health with external beauty.
Dr. Tager has developed numerous training programs for health-related companies and professional associations, including a 40-hour CME course on Personalized Nutrition for Practitioners for the American Nutrition Association. He is a sought-after speaker at leading U.S. and international conferences in functional medicine and aesthetics.
Tager serves as the Executive Director of THE Root Cause Project, producing patient-focused documentaries that explore how functional medicine treatments create health and well-being.
He is the co-founder, along with Peter Staats, MD, of the Vagus Nerve Society (VNSociety.org), and serves as host of the Healing Journeys documentary series.
His work brings together the Feed Your Skin Right book, the Inside Skin Beauty professional training course, and personalized Skin & Hair Genetic Testing.
Through his teaching, writing, and media work, Dr. Tager empowers clinicians to adopt innovative models of care that deliver better outcomes, stronger patient relationships, and greater professional fulfillment.
He completed his medical training at Duke University School of Medicine and his family practice training at the University of Oregon. He lives outside San Diego, where he grows impressive tomatoes.
Beauty is personal.
The approach should be too.
Inside Skin Beauty connects personal biology with thoughtful guidance on nutrition, lifestyle, supplementation, and skin and hair care.