The COSRX The Vitamin C 23 Serum is a potent brightening serum containing 23% pure Vitamin C (Ascorbic Acid) that visibly reduces dark spots, hyperpigmentation, and uneven skin tone. Enriched with Vitamin E and Hyaluronic Acid, it nourishes, hydrates, and soothes the skin, leaving it radiant and revitalized. Perfect for those seeking stronger brightening results.