PDRN Niacinamide Brightening Serum

COSRX

COSRX's PDRN Niacinamide Brightening Serum is a precision-engineered formula that targets the full spectrum of pigmentation concerns by combining salmon-derived PDRN with a clinical-grade 5% niacinamide concentration. Where many brightening products address melanin at a single point in the pigmentation pathway, this serum employs a multi-target strategy: niacinamide inhibits melanosome transfer from melanocytes to keratinocytes, tranexamic acid disrupts the inflammation-driven signals that trigger excess melanin production, alpha arbutin gently inhibits tyrosinase enzyme activity, and PDRN accelerates the cellular turnover that naturally sheds pigmented cells from the skin surface. This four-pronged approach reflects COSRX's ingredient-first philosophy — no single active is expected to carry the entire formula. Instead, each compound addresses a different mechanism in the hyperpigmentation cascade, creating cumulative brightening that is both more effective and more gentle than high concentrations of any single agent. The 5% niacinamide level is the clinical sweet spot: high enough for proven efficacy in reducing dark spots and improving barrier function, but low enough to avoid the flushing or irritation that can occur at higher concentrations in sensitive individuals. The serum has a clean, water-like texture that absorbs almost instantly, leaving zero residue or film. It sits comfortably under every type of sunscreen and makeup, making it an effortless addition to morning routines where sun protection and brightening work in tandem. The 40mL bottle provides generous volume for a treatment serum, typically lasting 6-8 weeks with twice-daily use. Apply 2-3 drops to cleansed skin after toner, morning and evening. In the morning, always follow with broad-spectrum SPF 50+ sunscreen — brightening actives make skin more photosensitive, and unprotected sun exposure will undo their work. For stubborn pigmentation, combine with COSRX's PDRN Collagen Serum for dual PDRN delivery and enhanced collagen support.