Health warning over 'dangerous' self tan product after increase in ads Melanotan (MT) II Melanocortin Receptor Agonist MedChemExpress 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 Reminder of serious health risks with 'Melanotan 2' self tan products Irish Pharmacist Melanotan 2 Peptide Foundry Premium Research Peptides