Serum for problem skin with 10% niacinamide and zinc The Ordinary Niacinamide 10% + Zinc 1% prevents blackheads, eliminates oily shine and tightens pores, softens, disinfects and evens out tone, making the skin soft and tender, without rashes and inflammation. Does not contain silicones, oils and alcohol. pH level 5.5-6.5.