La Roche Posay Effaclar Mat Is An Oil-Control Moisturizer That Combats Shine And Reduces Pore Size In Oily Acne-Prone Skin. Effaclar Mat Is Formulated With Sebulyse Which Helps To Mattify Skin And Tighten Pores. Sebulyse Sebo-Regulating Efficacy Is Clinically Proven To Be Superior To Zinc, The Standard Active Ingredient Used To Address Oily Skin Concerns.