Our cosmetic chemist, Louise Hidinger, Ph.D., answers:
Benzoyl peroxide is a chemical compound consisting of two benzoyl groups joined by a peroxide group (two oxygen atoms, joined by a single bond).
Peroxide compounds such as benzoyl peroxide are unstable as the oxygen-oxygen bond is weak. As a result, peroxides tend to decompose to release free radicals.
When benzoyl peroxide is applied to skin, it works to treat acne by two different modes of action which act in combination:
In addition, benzoyl peroxide is lipophilic (“oil-loving”). This is an important property as it allows benzoyl peroxide to penetrate readily into the outermost layer of the epidermis and enter pores that contain sebum and P. acnes bacteria – the areas where it is most needed!
Try our derm’s Acne Clarifying Treatment, a gel-based 5% benzoyl peroxide formula ($75, kellettskincare.com). Use promo code theskiny to receive 20% off.
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