Kojic Acid is a by-product in the fermentation process of malting rice, for use in the manufacturing of sake, the Japanese rice wine.Kojic Acid is a tyrosinase enzyme inhibitor that reduces the skin"s ability to produce and synthesise melanin. Melanin is what determines the colour pigmentation of the skin. This is why the Kojic Acid can make the area of skin whiter by preventing the synthesis of melanin. By stopping the production of melanin, kojic acid can reverse excessive darkening of the skin. Kojic acid is used in skin-whitening creams used to diminish dark areas resulting from excessive pigmentation in the skin. Kojic acid may help diminish or eliminate sun freckles, melasma or other pigmentation when used correctly. It normally takes 3-6 month of use to see sufficient results, and the darker your skin pigmentation, the longer it"s going to take to see results.Safety Measures/Side Effects:This substance may cause damage to your skin unless it is diluted in a cream or gel. Treatment should always be discussed with a health care professional before beginning a treatment program.FREE shipping within ALL the USA.