What is kojic acid?

Kojic acid is indeed a bleaching agent that is derived from certain fungi, particularly those found in Japanese mushrooms. This compound is known for its ability to inhibit the production of melanin in the skin, making it effective for skin lightening and treating conditions such as hyperpigmentation, dark spots, and melasma. The use of kojic acid in skincare products is popular due to its natural origin and its effectiveness in promoting a more even skin tone.

While other options mention various skin-related substances and supplements, they do not accurately represent the characteristics or source of kojic acid. For instance, bleaching agents derived from soybeans or exfoliants found in citrus fruits do not relate to the properties or usage of kojic acid. Similarly, a protein supplement for skin health does not connect with the chemical composition or function of kojic acid in skincare formulations. Therefore, the correct choice emphasizes the specific origin and function of kojic acid as a natural product used in skin lightening.