The C Rejuvenation Serum contains 8% pure vitamin C, the essential for skin radiance, with an antioxidant treatment to combat skin fatigue and pigmentation. It helps restore the skin's vitality and natural radiance. Suitable for all skin types. How to use: open the vitamin C cap while in the bottle and shake well to mix the vitamin C powder with the liquid. Use the freshly mixed serum within a week. Apply a thin layer every morning on cleansed skin on the face and neck. Warnings and precautions: keep refrigerated after use.