Highly concentrated with 23% pure vitamin C, The Vitamin C 23 Serum from COSRX works to visibly brighten and revitalise the appearance of your complexion. The daily facial serum is ideal for those with dull skin types, as it helps to diminish the look of uneven tone and discolouration.The formula uses an antioxidant-rich vitamin E derivative to help amplify the effect of vitamin C. Delivering hydrating and visibly plumping effects to the skin, the serum promotes a smooth, supple and radiant appearance.