The COSRX The Vitamin C 13 Serum is a potent, brightening serum that helps to enhance your skin’s radiance while reducing the appearance of dark spots, hyperpigmentation, and uneven skin tone. With 13% pure Vitamin C (ascorbic acid), this serum works to boost collagen production, protect against environmental damage, and improve skin texture for a smoother, healthier complexion. The lightweight formula absorbs quickly without irritation, making it suitable for most skin types, including sensitive skin. Packed with antioxidants, it also helps to fight signs of aging, leaving your skin visibly glowing and revitalized.