Kojic acid is a kind of melanin inhibitor with specificity, it can enter the cells of skin and combine with copper ions in the cell, change the three-dimensional structure of tyrosinase and block the tyrosinase activation, thereby inhibits the formation of melanin.
At present it has been added into all kinds of cosmetics to make whitening products against freckles, age spots, pigmentation and acne. Kojic acid also has the effect of clearing free radicals, enhancing the cells vitality, food preservation and color protection, it is also widely used in the field of medicine and food.