Melanotan vs. Astaxanthin for Glowing Skin Melanotan 1 MC1R Selective Peptide for Melanocortin Research 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 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