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Because Kojic acid can inhibits caseinase activity, then inhibits skin melanin formation, kojic acid and it's derivatives widely used in high-quality skin lightening cosmetics, bath preparation and mouth or teeth care products. Cosmetics containing kojic acid can treat freckle,acne, pigmentation and macula effectively without any toxic and bad results, At present, kojic acid's use level added in cosmetics is to O.2-1.0 percent. credits to: www.peakchem.com
