Cysteamine is widely used in the treatment of cystinosis, a rare genetic disorder where cystine accumulates in cells, causing damage to organs like the kidneys and eyes. It works by reducing cystine levels in cells, helping to slow disease progression. Additionally, it is utilized in veterinary medicine to manage certain conditions in animals. In cosmetics, cysteamine is incorporated into skincare products to reduce hyperpigmentation, dark spots, and melasma by inhibiting melanin production. In research, cysteamine serves as a reducing agent and is studied for its potential antioxidant properties. It is also explored for its role in mitigating oxidative stress and its effects on various cellular processes.