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 FlICk synthesis of an MSH array as analogues of melanotanII (see Download Scientific Diagram 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 Dysplastic Nevi Following Melanotan Use Actas Dermo Sifiliogrficas Can You Take Too Much Melanotan? A Z Guide