Kojic Acid has been around for almost 100 years. It was originally discovered by Japanese scientists who were working on different fermenting methods to turn malted rice into sake. As the story goes, the scientists noticed that spots and freckles on their hands disappeared after working with Sake production. Kojic Acid has been a popular Japanese beauty aid for generations. In recent years we’ve learned that Kojic Acid acts somewhat like hydroquinone by preventing melanin formation.
Research has shown that Kojic Acid can be effective but it has its problems. On the one hand it tends to be unstable and high concentrations are often needed to be an effective spot buster. On the other hand, Kojic can be very irritating and is known to cause allergic reactions. Often the best solution is to combine lower concentrations of Kojic acid with other skin lighteners like soy or hydroquinone.
If you want to try Kojic acid skin lightening creams, make sure you do a little patch test on your arm before slathering it on your face.