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 Safety: Tanning Injection LIVV Natural What is Melanotan II the drug that the TGA urges consumers to avoid? What exactly is Melanotan and how does the tanning solution work? White model Martina Big, who now a ''black' after taking tanning injections, announces plans to move to Africa.