Pure Vitamin C, found in oranges and lemons or other similar fruits, mainly use to control the pH concentration of cosmetic products. The main function is to exfoliate skin or remove dead skin cells. Helps to make skin smooth and soft, helps lighten complexion. Moisturizing properties repair sun damage (Suitable for dry skin.). It is a water-soluble acid, that gives more moisturizing effects. AHA Serum can be mixed with any lotion or body cream. It helps the lotion/cream to be absorbed easily by the skin. AHA Serum only is used on the body, not suitable for the face. AHA serum should only be used at night.