COSRX The Vitamin C 13 Serum 20ml is a serum that stars vitamin C. With 13% Vitamin C, this serum is a potent antioxidant serum that fights dullness and improves skin tone. This serum presents several benefits thanks to its formula. To begin with, Vitamin C is a powerful ingredient with antioxidant properties that illuminate the complexion and improve skin pigmentation. As such, the serum fades hyperpigmentation, brightens the complexion, and unifies the skin tone. In addition to this ingredient, the formula also features Hyaluronic acid and Super Vitamin E that work to fight skin aging, thereby reducing the appearance of fine lines and wrinkles.