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Kojic acid is sometimes used in health and beauty products. It may be used to treat skin conditions, such as sun damage, scars, and age spots.
The science behind how kojic acid works as a lightening agent involves its effect on melanin production.
Melanin is a naturally occurring pigment in the body that gives the eyes, hair, and skin their colour. An amino acid called tyrosine is needed to support the production of melanin.
Kojic acid works by blocking tyrosine from forming, which then prevents melanin production. Decreased melanin production may have a lightening effect on the skin.
Kojic acid is most commonly used in cosmetic products, such as creams, lotions, and serums. It is also used in some soaps.
Products containing kojic acid can also be used on other parts of the body, such as the legs and arms. The concentration of kojic acid in cosmetics is often between 1 and 4%
Certain products containing kojic acid, such as serums, are meant to be applied to the skin and left on and absorbed. Some products, such as soaps, are applied and washed off.
