Emerging Threat: Melanotan, Repackaging, and Online Sales Nasal tanning sprays warning issued by Trading Standards 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 Australia should stop beefing up its steroid laws that won't help users NDARC National Drug and Alcohol Research Centre