The most comprehensive source on the subject, The Science of Hair Care has been completely revised and expanded to include the most recent advances, technologies, and trends in hair and hair care science, tracking the development of hair care products, the emergence of new regulatory practices, and the latest methods in product safety and efficacy assessment. With many references and color photographs throughout, the second edition surveys dermatological and cosmetic disorders related to the hair and scalp. It describes the structural components and physical properties of human hair, devotes a chapter to the biological features of hair growth, and thoroughly reviews the safety and efficacy of hair products.