Melanotan Erectile Dysfunction: What the Research Actually Shows 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 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 Melanotan II PERMANENTLY Darkened My Skin! Melanotan II A Sun Kissed Look, and a Confident You. PDF) Melanotan Tanning Injection: A Rare Cause of Priapism