COSRX The Vitamin C 13 Serum 20ml is a gentle yet effective brightening serum formulated with 13% pure Vitamin C (Ascorbic Acid) to revitalize dull skin and reduce dark spots. Enriched with active ingredients like Hyaluronic Acid, Niacinamide, and Allantoin, it provides antioxidant protection, boosts collagen production, and improves skin texture. This lightweight, fast-absorbing formula targets uneven skin tone and early signs of aging while hydrating and soothing sensitive skin. Ideal for beginners to Vitamin C, it delivers a radiant, clearer complexion with regular use.