Your body already makes a hormone that tells your skin to tan. Melanotan 2 is a synthetic peptide engineered to mimic that hormone but in a version that's more potent and Eruptive naevi and darkening of preexisting naevi 24 h after a single mono dose injection of melanotan II Semantic Scholar R3TA (GLP 3) 10mg Melanotan AUS Activation of the central melanocortin system in rats persistently reduces body and fat mass independently of caloric reduction