The Niacinamide 15% Serum: Refine Pores, Smoothen Skin. Niacinamide and Zinc PCA instantly improves skin texture and radiance by reducing excess oil and minimizing pore sizes. Key Benefits: Based on real results from consumers' self assessments, the Niacinamide 15 Serum minimizes pore size, improves skin texture, and helps fade dark spots. Dermatological Ingredients: 15% Niacinamide helps minimize enlarged pores and refine uneven skintone. 1% Zinc PCA prevents potential breakouts from occurring. How to Use: Shake 1-2 times before use and apply 2-3 drops once or twice daily. For daytime wear, follow up with SPF 30+ sunscreen. Can be applied under the eye area; avoid direct eye contact. COSRX Standards: All COSRX products are formulated with skin-friendly ingredients that alleviate irritated skin. Hypoallergenic, Dermatologist tested, Animal Testing-FREE, Parabens-FREE, Sulfates-FREE, Phthalates-FREE