Safe Hair Coloring: Natural & Ammonia-Free Options
Are hair colors safe? Clear, evidence-based guidance Intro — short answer Hair coloring carries some risks, yet many products are safe when used correctly. For most people, the main hazards are scalp irritation and allergic reaction. Rarely, long-term chemical exposure may raise other health concerns. Read on for practical steps, science, and safe choices. Key studies and expert guidance back the points below. How hair color works — simple technical view Hair dyes fall into two groups: oxidative and non-oxidative. Oxidative dyes use a developer (peroxide) and often ammonia to open the hair cuticle. They change pigment inside the strand. Non-oxidative dyes, like vegetable dyes, coat the hair surface. Each type affects hair differently. Oxidative systems give longer-lasting color but strain hair more. Main safety issues and what the evidence says 1) Allergic reactions (common, manageable) The most common serious reaction is contact allergy to PPD (para-phenylenediamine). Patch te...