Frank Dreher, PhD, is Founder and President of Topalix LLC, San Francisco, California, USA. Elsa Jungman, PhD, is Founder and CEO of ELSI Skin Health, Inc., San Francisco, California, USA. Kazutami Sakamoto, PhD, is Guest Professor of Pure and Applied Chemistry, Tokyo University of Science, Japan. He is also editor of Cosmetic Science and Technology: Theoretical Principles and Applications.

Howard I. Maibach, MD, is Professor of Dermatology at the University of California School of Medicine, San Francisco, California, USA. He is also the editor of Cosmeceuticals and Active Cosmetics 3E, Handbook of Systemic Drug Treatment in Dermatology 2E, Contact Urticaria Syndrome, Textbook of Cosmetic Dermatology 5E, Dermatotoxicology 8E, and Topical Nail Products and Ungual Drug Delivery, among many others.

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