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 Nasal sprays containing the 'Barbie Drug' melanotan are very, very dangerous and completely unregulated, according to leading dermatologist. Experts say there has been a surge in the use of the illegal tanning aid Afamelanotide tested as a new treatment for vitiligo Vitiligo Clinic The Tanning Drug What Patients Should Know What is melanotan and why is it so dangerous?