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 2 Reviews, Clinical Trials, and Safety Really dangerous' tanning products containing melanotan 2 on the rise warns dermatologist Express.co.uk No, you don't need the 'Barbie drug' to tan, whatever TikTok says. Here's why melanotan II is so risky