The Niacinamide 15 Serum 20ml - COSRX"Description: The COSRX The Niacinamide 15 Serum is a powerful brightening and skin renewing serum formulated with 15% Niacinamide to visibly reduce dark spots, control oil production, and refine skin texture. Enriched with Zinc PCA and Allantoin, it soothes irritated skin while preventing breakouts and strengthening the skin barrier. Feature Details Brand COSRX Volume 20ml 0. 67 oz. Key Ingredients 15% Niacinamide, Zinc PCA, Allantoin Skin Type Oily,