The CU Dr.Solution Niacin 10% Vitamin C Ampoule is a concentrated niacin ampoule designed to improve overall skin health. 10% niacinamide for brightening, sebum control, and pore improvement. Vitamin C derivative (Ethyl Ascorbyl Ether) for stable brightening. Glutathione acts as an antioxidant to prevent melanin production. Non-sticky, watery texture absorbs quickly.