COSRX The Vitamin C 23 Serum is a potent skincare solution designed to enhance skin elasticity with a remarkable 23% concentration of stabilized pure vitamin C. This highly effective serum targets hyperpigmentation, dullness, and uneven skin tone while reducing the appearance of wrinkles. The unique two-layer formulation, with oil on top, helps to slow oxidation, ensuring maximum potency and a moisturizing finish. Ideal for those with prior experience using vitamin C, this serum delivers intensive care for vibrant, youthful-looking skin.