Love Island generation' skin cancer fear 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 Consumers warned to avoid 'dangerous' nasal tanning sprays and gummies The Independent Melanotan is trending again. As a dermatologist, I strongly need to tell you , Its an unapproved injectable peptide, and were seeing:, nausea and flushing, darkening of existing moles, Melanotan II A Sun Kissed Look, and a Confident You. Is Melanotan the New Solarium for a Perfect Tan?