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 Imagine just wanting to be jacked and tan and you end up like this? Melanotan II is a peptide that increases the melanin in your skin and can give men a boner that Melanotan 2 Reviews, Clinical Trials, and Safety Melanotan 2 Injectable Peptide Melanotan II A Sun Kissed Look, and a Confident You. What is Melanotan II the drug that the TGA urges consumers to avoid?