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 Melanotan 2 Reviews, Clinical Trials, and Safety Clinically important side effects of Melanotan II and placebo Download Table No, you don't need the 'Barbie drug' to tan, whatever TikTok says. Here's why melanotan II is so risky Warning issued over increased use of 'Barbie drug' Melanotan II synthetic tanning drug mo Stock Image Science Source Images