Melanotan II Results (With Before And After Pictures) The Tanning Drug The "Barbie Drug" Has a Dark Side This guy injected himself with a drug called Melatonan II for 5 months. Here's his before after. : r pics 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 melanotan II C50H69N15O9 CID 92432 PubChem