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 What It Is and Its Relation to Skin Cancer Melanotan (MT) II Melanocortin Receptor Agonist MedChemExpress Dangerous 'Barbie drug' Melanotan II sparks crackdown on social media influencers ABC News Melanotan 1 MC1R Selective Peptide for Melanocortin Research