Efficacy: This product can effectively improve the skin defects, repair the reddening skin, even the rough pores, balance the oil secretion, reduce the facial oil light, and create the smooth and bright skin for you. Main ingredients: 1. Niacinamide: a vitamin, which can lighten skin blemishes and improve pore blocking. 2. PCA zinc: a mineral, which can control the oil secretion of skin. Usage: After skin care in the morning and evening, apply a small amount of this product to the face before taking care of the oil, moisturizing products and cream. This product cannot be used with products containing pure vitamin C (ascorbic acid).