The most common use is to achieve a darker tan with little or no UV exposure, which theoretically reduces the risks associated with sunbathing. Melanotan I (afamelanotide) is approved in some countries (not the US) for a specific light-sensitive condition called erythropoietic protoporphyria (EPP) to increase pain-free light exposure.
UV Protection: The increased melanin production can provide a natural protective barrier against harmful UV rays, potentially reducing the likelihood of sunburn and skin damage.
Enhanced Sexual Function: Melanotan II, in particular, can increase libido and has shown effectiveness in producing erections in men with erectile dysfunction (ED), even in some who do not respond to drugs like sildenafil. A related drug based on Melanotan II, bremelanotide (brand name Vyleesi), has been approved for hypoactive sexual desire disorder in premenopausal women.