It is used in the field of cosmetics. For spot-removing and whitening, in human skin, tyrosine undergoes complex oxidation and polymerization with oxygen free radicals under the catalysis of tyrosinase, and finally synthesizes melanin. Kojic acid can inhibit the synthesis of tyrosinase, so it can strongly inhibit the formation of melanin in the skin. It is safe and non-toxic, and will not cause leukoplakia. Therefore, Kojic acid has been formulated into lotions, facial masks, lotions, and skin creams. Whitening cosmetics that can effectively treat freckles, age spots, pigmentation, acne, etc. are made. Kojic acid at a concentration of 20ug/ml can inhibit 70-80% of the vitality of a variety of tyrosinase (or polyphenol oxidase PPO). The recommended dosage in cosmetics is 0.2-1.0%.