U.S. shopper note: This editorial guide compares how niacinamide is used in Korean formulas and what oily-skin shoppers should check before adding another serum. Is Niacinamide Good for Oily Skin? A K-Beauty Expert’s Guide Yes, niacinamide is an excellent ingredient for oily and acne-prone skin. This form of Vitamin B3 works by regulating sebum production…