Cosmetic Raw Materials bulk 1. What is kojic acid powder? Kojic acid,the chemical name is 5-hydroxy-2-hydroxymethyl-1,4-pyrone, exists in the brewing of soy sauce, bean paste, and wine, and can be detected in many fermented products fermented with Aspergillus The presence of kojic acid. Kojic acid is a weak acid compound produced by fermentation. It has a small molecular weight and can be...