Our nicotinamide brightening serum contains grapefruit extract, nicotinamide, and hyaluronic acid. It can effectively improve uneven skin tone and make the skin appear even luster. Continuous use brightens skin for a healthy glow. Its application method is simple: 1. Clean facial skin and keep it dry. 2. Apply appropriate amount of the product evenly on the face; 3. Gently massage until absorbed. Reduces dullness and stain, brightens skin tone. Leave your skin glowing and looking healthy and bright.