Used primarily as a skin-lightening agent in topical creams to treat hyperpigmentation, melasma, and age spots. It works by inhibiting tyrosinase, an enzyme involved in melanin production, thereby reducing skin discoloration. Commonly found in cosmetic and dermatological formulations, often in concentrations from 2% to 5%, and sometimes combined with other agents like retinoids or corticosteroids for enhanced effect. Also utilized as a stabilizer in polymerization reactions and in photographic developing solutions due to its reducing properties.