The COSRX The Niacinamide 15 Serum is a brightening serum that helps even skin tone and reduces pigmentation. With 15% niacinamide, it minimizes pores and controls oil production. This lightweight, fast-absorbing serum is suitable for all skin types, particularly for uneven skin tones or acne-prone skin. It hydrates and balances the skin, leaving it looking clear and refreshed.