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 Risks of Melanotan: TGA to issue fresh warning against 'Barbie drug' The Australian Melanotan II: Tanning injections, nasal sprays harmful to health ZZZ Sleep Nasal Spray LeadWest Medical Nasal tanning sprays linked to skin cancer, trading standards officers warn Consumer affairs The Guardian