A lightweight serum containing Vitamin C to fight early signs of aging and improve skin brightness. Before use, it is recommended to patch-test this serum due to its highly concentrated pure Vitamin C content. Dermatological ingredients include pure Vitamin C (Ascorbic acid), Super Vitamin E (Tocotrienol), and Hyaluronic acid for youthful glowing skin, fighting signs of aging, and delivering rich moisture deep into the skin. To use, shake 1-2 times before applying 2-3 drops once or twice daily, and follow up with SPF 30+ sunscreen for daytime wear. Can be applied under the eye area, avoiding direct eye contact. Store in the fridge to prevent oxidation. COSRX products adhere to skin-friendly standards and are hypoallergenic, dermatologist tested, and free of animal testing, parabens, sulfates, and phthalates.