The Hidden Dangers of Tanning Nasal Sprays That You Should Be Aware Of 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 Use Melanotan 2 Nasal Spray for Better Tanning Effects by Megatan uk Infogram Viral 'Barbie drug' for tanning can cause brain swelling and even cancer, experts warn