This Isntree Hyper Vitamin C 23 Serum is a potent skincare treatment designed to address hyperpigmentation and promote a radiant complexion. Formulated with 23% Pure Vitamin C (Ascorbic Acid), it effectively works to even out skin tone. The serum also contains Tocopherol (Vitamin E) to enhance antioxidant synergy and Panthenol to strengthen the skin barrier, moisturize, and soothe the skin. Infused with Birch Juice, it further hydrates and calms the skin. The lightweight formula is fast-absorbing, making it suitable for daily use after toner application. Dispense 2-3 drops and gently pat onto the face for optimal absorption. Due to the high concentration of Vitamin C, it is recommended to store the product in a cool, dark place away from direct sunlight and to use it once every 3-4 days. The serum comes in a 20ml size.