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 No, you don't need the 'Barbie drug' to tan, whatever TikTok says. Here's why melanotan II is so risky April, 2023 SureTan Tanning Injections & Melanotan 2 UK Suppliers Viral 'Barbie drug' for tanning can cause brain swelling and even cancer, experts warn