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 Stop Taking Melanotan II Dermatologist Breaks It Down Eruptive Dysplastic Nevi Following Melanotan Use Actas Dermo Sifiliogrficas How to Mix Melanotan 2 Injections Easy Instructions Viral 'Barbie drug' for tanning can cause brain swelling and even cancer, experts warn