Target excess oil, visible pores and post-blemish marks with COSRX The Niacinamide 15 Serum. This concentrated Korean treatment contains 15% niacinamide to improve uneven tone, support a clearer complexion and help balance sebum. N-acetylglucosamine and zinc PCA complement the formula for oily, combination and blemish-prone skin.

After cleansing and toner, apply two to three drops over the face or targeted areas. Start once daily or every other day and increase as tolerated. Follow with moisturizer and use SPF in the morning. Reduce frequency if dryness or irritation develops.

Key ingredients: 15% niacinamide, N-acetylglucosamine, zinc PCA, allantoin and moisturizing humectants.