Book excerpt: Written by experienced and internationally renowned contributors, this is the fourth edition of what has become the standard reference for cosmetic scientists and dermatologists seeking the latest innovations and technology for the formulation, design, testing, use, and production of cosmetic products for skin, hair, and nails. New to this fourth edition are chapters on dermatocosmetic vehicles, surface film, causes and measurement of skin aging, make-up products, skin healing, cosmetics in sports, cosmetotextiles, nutricosmetics, natural ingredients, cosmeceuticals, and regulatory vigilance.