Overview: Benzoyl peroxide is used to prevent and treat acne. Some forms of benzoyl peroxide are also used to treat rosacea. Benzoyl peroxide works by killing bacteria, or germs, that cause acne, and ...

Hydrogen peroxide is a common ingredient in hair dyes, but experts warn it may weaken hair fibres over time, causing dryness, breakage, scalp sensitivity, and long-term damage.