Urea Peroxide

Urea peroxide is a chemical compound that combines urea with hydrogen peroxide. It functions as an oxidising agent in skincare, meaning it releases oxygen when applied to the skin. This mechanism allows it to work on surface debris and support other active ingredients in fighting acne-causing bacteria.In formulations, urea peroxide is typically paired with other actives—most commonly benzoyl peroxide for acne treatment. The urea component also acts as a humectant, helping to draw moisture into the skin, and has mild keratolytic properties that may help with gentle exfoliation.

Urea peroxide breaks down on the skin to release oxygen and urea. The oxygen has an oxidising effect that can help disrupt acne-causing bacteria and may support the removal of benign skin growths. This is why it's often used as a vehicle (base ingredient) for benzoyl peroxide formulations.The urea itself contributes to the formula's tolerability: as a humectant, it binds water to the skin's surface, reducing dryness and irritation. Its mild keratolytic action also helps the skin shed dead cells more evenly, which can improve how well active ingredients penetrate.

Urea peroxide is rarely used as a standalone ingredient; it's most commonly encountered in acne treatment systems formulated with benzoyl peroxide. Follow product instructions carefully, as usage frequency and concentration will depend on the specific formulation and your skin's tolerance. Start with the lowest recommended frequency if you're new to the product, then adjust based on how your skin responds. Always use sunscreen during the day, as oxidising agents can increase photosensitivity.

Urea peroxide is generally well-tolerated, particularly when formulated with additional hydrating ingredients like urea itself. Avoid contact with eyes and mucous membranes. Discontinue use if irritation, redness, or sensitivity develops, and patch test before full application if you have sensitive skin.