Cosrx The Niacinamide 15 Serum is a powerful acne-care formula featuring 15% niacinamide blended with Acetyl Glucosamine and Zinc PCA to deliver comprehensive treatment for blemish-prone skin. This highly concentrated yet lightweight serum absorbs easily, helping to reduce excess oil, refine pores, smooth rough texture, and even out skin tone for a clearer, more radiant complexion. Non-comedogenic and gentle on the skin, it’s suitable for oily, combination, and acne-prone types, addressing all stages of acne—from prevention to post-breakout care. It also targets concerns such as bumpy skin, sebum overproduction, enlarged pores, and hyperpigmentation. With its light, refreshing texture, it layers effortlessly under skincare or makeup without leaving any residue.