Eliminate blemishes while preventing new breakouts with La Roche-Posay Effaclar Duo Acne Treatment with Benzoyl Peroxide. Formulated with 5. 5% benzoyl peroxide to dry out blemishes and 0. 4% micro-exfoliating LHA smoothes skin texture. Formulated to penetrate your skin, this acne solution unclogs pores as it clears blackheads and whiteheads. Allure Magazine 2011 Best of Beauty Award for Beauty Breakthrough. | La Roche-Posay Effaclar Duo Benzoyl Peroxide Acne Treatment | Dermstore