Your Favorite Acne TreatmentsCan they be mixed? Depends
"If you layer salicylic acid or benzoyl peroxide with a retinol or AHA, that is risking irritation and skin barrier breakdown," says Gohara. She recommends using one in the morning and the others in the evening to avoid irritation. She also notes that "benzoyl peroxide formulations can inactivate some retinols," which makes separation more important. Of course, salicylic acids and benzoyl peroxide are often used in conjunction with each other — just be sure to use caution when it comes to retinol and AHA products.
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