Kojic acid is produced naturally in a number of plant species, such as mushrooms, and is also a bi-product of the fermentation process of soy and rice wine. It is used in cosmetics for its ability to target hyperpigmentation, and works by inhibiting the enzyme tyrosinase, which is involved in producing the pigment in our skin, known as melanin. A reduction in the activity of this enzyme helps to minimise the overproduction of melanin, and help reduce areas of hyperpigmentation.