The last product to be applied before the Treatment Stage. Biologique Recherche face masks are highly concentrated in active ingredients to balance and purify the epidermis. The masks contain essential fatty acids, which enrich the skin’s proteo-lipidic film after exfoliation and prepare it to receive the formulations in the Treatment Stage. Biologique Recherche’s skincare protocol deliberately times the “face mask moment” for the middle of the experience, so that the active ingredients used during the Treatment Stage aren’t washed away when the mask is removed.