Teen Boys and Young Men Are Injecting Peptides in Search of Perfection WSJ Can You Use Melanotan Long Term? 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! PDF) Melanotan Tanning Injection: A Rare Cause of Priapism