Our daily mandelic acid Update serum contains mandelic acid, salicylic acid and pyruvate. It can boost skin metabolism and solve five major pore problems - thick corneum, large pores, blackheads, acne and pimples. Its use method is very simple: after cleansing, before toning, apply appropriate amount evenly on the face and neck. Use every day, day and night. And can remove blackheads, narrow pores gently, moisturize sensitive skin.