The 'Barbie' drug killing fake tan fans NZ Herald What is Melanotan II the drug that the TGA urges consumers to avoid? Here's the part nobody explains when they're selling you the "Barbie drug." Melanotan 2 is a synthetic peptide that mimics alpha MSH a hormone your body already makes to tell your skin The weight loss drug Melanotan 2, also known as the Barbie drug, has taken social media by storm. Melanotan 2 is widely promoted online, despite it being illegal and dangerous in the UK. Amber Haque Barbie drug' nasal spray tan plugged by influencers causes cancer, doctors warn