An overview of cosmetic toxicology

Cosmetic toxicology evaluates the safety and biological risks of beauty and personal care formulations to safeguard consumer health. Governed by core principles such as dose-response relationships and dermal absorption kinetics, safety assessments evaluate both localized dermatological impacts—including irritant and allergic contact dermatitis—and chronic systemic hazards. Key safety concerns stem from hazardous chemical exposures, including endocrine-disrupting parabens, sensitizing preservatives like methylisothiazolinone (MI), oxidizable fragrances, and heavy metal contaminants such as lead and mercury. Historical and modern public health challenges—notably lead toxicity in Venetian Ceruse, asbestos contamination in cosmetic talc, and the widespread use of unregulated skin-lightening products containing hydroquinone, mercury, and topical corticosteroids in Nigeria—underscore the necessity of robust oversight. To mitigate these hazards, regulatory agencies like the European Commission, the US FDA, and Nigeria’s NAFDAC enforce stringent quality and ingredient standards. Concurrently, modern testing methodologies are advancing past conventional animal models toward in vitro reconstructed human tissues, in silico AI predictive tools, and green toxicology principles to deliver sustainable, scientifically validated cosmetic safety.