This book comprehensively reviews essential oils and fragrances and their role in cosmetics and personal care products. The initial chapters define essential oils, outline their types, and discuss their widespread use in cosmetics, delving into the specific fragrance compounds that contribute to personal care products' sensory and functional attributes. The book addresses critical safety and toxicological assessments, including risk assessment methodologies, toxicological testing requirements, and allergen labeling and management. It emphasizes Good Manufacturing Practices (GMP), providing guidelines and certification processes for product quality and safety. The book provides an overview of key international regulatory bodies and standards, such as ISO and IFRA, and discusses efforts towards harmonization and establishing international standards. It presents strategies for global compliance, including case studies of multinational companies that have successfully navigated regulatory challenges. Furthermore, the book examines innovations and regulatory responses, particularly the impact of new technologies like synthetic biology. This book is aimed at professionals in the cosmetic industry, such as product developers, regulatory specialists, and marketing professionals. Key features Explores the essential oils and fragrances in detail, covering definitions, types, and their roles in cosmetics and personal care products Guides safety assessments, Good Manufacturing Practices (GMP), labeling, and advertising regulations Reviews key international regulatory bodies like ISO and IFRA and discusses efforts towards standard harmonization Includes case studies of multinational companies and offers strategies for global compliance Examines the impact of new technologies like synthetic biology and current trends towards sustainability and transparency