COSRX The Niacinamide 15 Serum 20mL

COSRX The Niacinamide 15 Serum is a high-concentration niacinamide serum designed to address excess sebum, uneven skin tone, enlarged pores, and acne-related skin troubles. With 15% niacinamide plus complementary actives like acetyl glucosamine and zinc PCA, it helps balance oil production, soothe inflammation, fade post-acne marks, and improve skin texture — giving a smoother, clearer, more balanced complexion overall. COSRX Official +2 COSRX +2

Key Features

15% Niacinamide — a potent dose that helps regulate sebum production, control excess oil, reduce acne formation, and support even skin tone. COSRX Official +1

Acetyl Glucosamine (N-acetylglucosamine) — works synergistically with niacinamide to help improve skin tone / brightening and assist in fading hyperpigmentation or dark spots. COSRX Official +1

Zinc PCA — helps control oil and sebum, reduce acne-causing inflammation, and promote healthier skin recovery. Ulta Beauty +1

Soothing & barrier-supporting agents like allantoïn and humectants, which moisturize skin and help prevent irritation even on oily or acne-prone skin. SkinSort +1

Lightweight, fast-absorbing texture — easily layers under moisturizer or other skincare; doesn’t feel heavy or greasy, making it suitable for oily / combination / acne-prone skin. COSRX Official +1

How to Use After cleansing and toning (morning and/or evening), apply a few drops of the serum onto clean skin. Gently massage or pat until fully absorbed. Then follow with moisturizer or cream. If used in the morning, remember to apply sunscreen (SPF 30 or higher) afterward. COSRX Official +1

Volume 20 mL COSRX Official +1

Ingredients: Water, Pentylene Glycol, Niacinamide (15%), Butylene Glycol, Acetyl Glucosamine, 1,2-Hexanediol, Zinc PCA, Trehalose, Xanthan Gum, Pullulan, Allantoin, Ethylhexylglycerin, Sodium Phytate, Citric Acid, Tocopherol (Vitamin E)