Our Vitamin C brightening serum contains glycerin and hydroxyethyl cellulose. It strengthens the skin barrier and improves defense; Promotes collagen synthesis and brightens skin. Deeply nourishing, anti-oxidant, keeps skin soft and smooth. Its use method is very simple: 1. Wash your face. 2. Apply proper amount of serum to face with eye dropper. 3. Gently massage outward from the center of the face, in a circle, until fully absorbed. Rejuvenate your skin and rejuvenate it. Improve uneven skin tone, even light.