Melanotan II synthetic tanning drug mo Stock Image Science Source Images Melanotan 1 vs. 2: My Summer Journey & Real Results Natural Kaos Melanotan 2 Achieve Sunless Tan Naturally and Safely Here's the part nobody explains when they're selling you the "Barbie drug.", Melanotan 2 is a synthetic peptide that mimics alpha MSH a hormone your body already makes to tell your skin cells to 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 longer lasting than