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Kojic acid, with the CAS number 501-30-4, is a natural compound that is often used in skincare products for its skin-lightening and brightening properties.

1. Chemical Formula: C6H6O4
2. Molar Mass: 142.11 g/mol
3. Appearance: Kojic acid is a white to off-white crystalline powder.
4. Source: Kojic acid is derived from fungi like Aspergillus oryzae, as well as some species of Acetobacter, which are commonly found in plant and animal tissues.
5. Function: Kojic acid is used in skincare products to inhibit the production of melanin in the skin, which can help reduce the appearance of dark spots, freckles, and other forms of hyperpigmentation.
6. Stability: Kojic acid can be sensitive to light and air, so it is often formulated in products that protect it from oxidation.
7. Safety: While kojic acid is generally considered safe for topical use, some individuals may experience skin irritation or allergic reactions. It's important to do a patch test before using products containing kojic acid extensively.
8. Regulation: The use of kojic acid in cosmetics is regulated by various agencies to ensure its safe use and appropriate concentration levels.

Kojic acid is a popular ingredient in products like skin-lightening creams, serums, and moisturizers, offering a natural alternative to synthetic skin-lightening agents