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 Dermatologist Explains: Melanotan 2, SPF Oils, and More! Illegal tanning nasal spray not a 'harmless alternative' to sunbaking, says TGA ABC News Man warns against 'dangerous' tanning injections after turning so dark he 'looked like Madge from Benidorm' and now has the freckled skin of a 60 year old