Benzoyl peroxide is a commonly recommended active ingredient for reducing acne. It works by eliminating Cutibacterium acnes, the bacteria responsible for inflammation, as well as reducing excess sebum and removing keratin build-up in the stratum corneum. Available over-the-counter or by prescription, depending on the concentration and severity of the acne, it nevertheless raises many questions and is often the subject of myths. Here are the answers to the most frequent misconceptions.