The COSRX The Niacinamide 15 Serum is a highly concentrated serum that combines the maximum concentration of niacinamide with optimal ratios of synergistic ingredients for total acne control
. The serum contains 15% niacinamide, which provides total acne care by controlling sebum production, soothing acne inflammation, and diminishing post-acne scars. It also contains N-Acetylglucosamine (NAG), which works in synergy with niacinamide to effectively fade hyperpigmentation, Zinc PCA, which inhibits inflammation and promotes recovery of damaged skin, and Allantoin, which promotes collagen synthesis to facilitate skin regeneration
. The serum is suitable for acne-prone skin use and is non-comedogenic
. Clinical trials of 20 subjects showed a 45.27% improvement of activated sebaceous glands, a 48.07% improvement of oil synthesis amount, a 42.72% improvement of the number of blackheads, a 50% improvement of the number of whiteheads, a 15.50% improvement of (hidden melasma and blemishes), and a 19.47% improvement of pigmentation (visible melasma and blemishes) in 4 weeks
. The serum can be used in the morning and/or night and should be applied after cleansing during the serum phase
