What is melanotan and why is it so dangerous? 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 Dangerous 'Barbie drug' Melanotan II sparks crackdown on social media influencers ABC News 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 Melanotan 2: 10 mg for Research UK SARMs