The liquid serum with 10% niacinamide is ideal for combination and oily skin and has been proven to reduce sebum production. ** As a result, it leaves the skin with a smoother appearance, with fewer imperfections and matte. ** The study was performed on 30 women with oily or combination skin aged between 18 and 40. The serum was applied twice a day for a period of 4 weeks.
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