Kojic Acid has a long history of consumption as well as use in Japanese culture and is considered one of the primary secrets, as well as the cornerstone of Japanese skincare tradition. The main mechanism of action of Kojic Acid is the prevention of the formation of tyrosine in the skin, an amino acid that produces melanin, which in turn causes dark spots, freckles and other skin damage. When the production of melanin is inhibited, it results in your skin looking younger, brighter and lighter.