COSRX — The Niacinamide 15 Serum 20ml

The Niacinamide 15 Serum is the most thoroughly documented pore-sebum serum in the catalog. What sets this product apart: (1) Niacinamide is declared at 15% directly in the INCI—which implies analytical verification by the manufacturer and a level of transparency far above the norm (the vast majority of brands do not declare concentrations in cosmetic INCI). (2) The 15-ingredient formula is short and clean—each active ingredient has an identifiable role. (3) Zinc PCA (~1% according to brand data) is the co-active ingredient for sebum regulation and anti-inflammatory properties. Its astringent properties help reduce the apparent pore size, and it promotes the regeneration of small residual blemish scars. (4) Acetyl Glucosamine is a glucosamine derivative that inhibits melanin synthesis and facilitates barrier renewal—to be distinguished from dietary glucosamine. (5) Pullulan (a fungal fermentation polysaccharide) forms a natural film on the skin that provides an immediate and temporary pore-tightening effect—a "film" effect that can be highlighted in marketing discourse. (6) Allantoin ensures tolerance for sensitive skin. (7) Clinical data dates from 2022—older than the Snail studies (2025) but based on 6 well-documented metrics. Pregnancy-safe validated. Pack_SAFE validated (fragrance-free, retinol-free, strong acid-free). The fact that COSRX has declared the concentration in the INCI is likely related to a desire for transparency and constitutes a strong selling point in pharmacies.