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 II Safety: Tanning Injection LIVV Natural IMB issues warning over tanning injections at salons or bought on internet The Irish Times The Dangers of Melanot*n II Explained Melanotan What It Is and Its Relation to Skin Cancer Nasal tanning sprays linked to skin cancer, trading standards officers warn Consumer affairs The Guardian