Melanotan (MT) II Melanocortin Receptor Agonist MedChemExpress How Melanotan Peptides Work to Enhance Skin Tone and Promote Tanning Age Well ATL Viral 'Barbie drug' for tanning can cause brain swelling and even cancer, experts warn 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 Melanotan II Safety: Tanning Injection LIVV Natural