Kojic acid has many uses in dermatologic products, primarily as a skin lightener but concerns about its irritant properties have limited its role in cosmetics. Kojic acid is a common ingredient in skin lightening or depigmenting products. Kojic acid can cause some side effects, particularly for those with sensitive skin. However, the Cosmetic Ingredient Review (CIR) Expert Panel has determined concentrations up to 1 percent kojic acid are considered safe to use in cosmetics, as published in the November-December 2010 issue of “International Journal of Toxicology.”

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