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In page Benzoyl peroxide:

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In the U.S., the typical concentration for benzoyl peroxide is 2.5% to 10% for both prescription and over-the-counter drug preparations that are used in treatment for acne. Higher concentrations are used for hair bleach and teeth whitening. Benzoyl peroxide, like most peroxides, is a powerful bleaching agent. Contact with fabrics or hair can cause permanent color dampening almost immediately. Even secondary contact can cause bleaching; for example, contact with a towel that has been used to wash off benzoyl peroxide-containing hygiene products.[3] Benzoyl peroxide is also used as a radical initiator to induce chain-growth polymerization reactions,[4] and is the most important among the various organic peroxides used for this purpose.[5]