Obagi CLENZIderm MD Penetrating Acne Therapeutic System is a simple three-step system, which includes Daily Care Foaming Cleanser, Pore Therapy and Serum Gel. These products work together to provide a clinically proven acne-control system that delivers rapid results. What sets CLENZIderm MD apart from other acne treatments? This state-of-the-art acne system is formulated with proven acne-fighting ingredients, including a breakthrough, patent-pending, penetrating formula of 5% benzoyl peroxide. Unlike other benzoyl peroxides, it penetrates the pores deeply, all the way down the follicles, where acne first forms - to stop acne where it starts. The end result: you can achieve cleaner, healthier, breakout-free skin - fast!