Our Vitamin C Collagen face serum contains glycerin and hydroxyethyl cellulose. It can be used through the process of "early C and late A" to protect the skin during the day, repair the skin at night, care for the skin all day, and achieve 24-hour skin health management. The way to use it is simple: 1. Wash your face. 2. Apply proper amount of essence evenly on face and gently massage in circular motion until dispersed. 3. Gently pat your face to fully absorb the product. And as you age, your skin naturally becomes less elastic and more fragile. The rate of skin repair is much slower than when you were young. This can lead to sagging, sagging skin and more pronounced wrinkles.