Cosrx The Niacinamide 15 Serum 20MLTotal acne care with 15% niacinamide The highly concentrated 15% niacinamide serum formula is blended with Acetyl Glucosamine and Zinc PCA for comprehensive acne care, with a texture that allows for easy absorption into the skin. This optimal ratio of synergistic ingredients also helps address excess oil, uneven skin tone, lack of radiance, and rough skin texture. Recommended for COSRX The Niacinamide 15 serum is for those with oily, combination, or