Intensively target dark spots and dullness with COSRX Advanced The Vitamin C 23 Serum. This potent Korean antioxidant serum contains 23% pure vitamin C to visibly brighten uneven tone, improve radiance and support collagen against environmental stress. Designed for experienced vitamin-C users who want a concentrated treatment in a lightweight texture.

After cleansing and toner, apply two to three drops to dry skin, avoiding eyes and damaged areas. Start two or three evenings weekly and increase as tolerated. Follow with moisturizer and use SPF every morning. Store tightly closed in the refrigerator after opening and use promptly.

Key ingredients: 23% pure ascorbic acid (vitamin C), tocotrienol (super vitamin E), hyaluronic acid, allantoin and moisturizing humectants.