COSRX The Vitamin C 23 Serum delivers a potent 23% pure vitamin C concentration designed to brighten dull complexion and reduce the appearance of dark spots and hyperpigmentation. This lightweight serum absorbs quickly without leaving residue, making it ideal for layering within your skincare routine. The stabilized formula works to enhance skin radiance while supporting collagen production for improved firmness. Suitable for most skin types, this 20g bottle provides concentrated treatment that addresses uneven tone and promotes a luminous, youthful glow. Apply to clean skin before moisturizer for optimal results.