Experts warn that using Melanotan II, a nasal spray tan, is not as harmless as it first appears, urging Aussies striving to be beautifully bronzed to stick to fake tan., , #spraytan #melanotan 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 What It Is and Its Relation to Skin Cancer 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,