Warning issued over increased use of 'Barbie drug' 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 Teen Boys and Young Men Are Injecting Peptides in Search of Perfection WSJ MT 2 Melanotan II 10 mg Melanotan II Safety: Tanning Injection LIVV Natural It doesn't take much to fall down the Barbie Drug rabbit hole. In self tanner subreddits and on TikTok Shop, the tanning injectionaka Melanotan IIis marketed as a self tanner alternative that works by