What is Melanotan II the drug that the TGA urges consumers to avoid? Melanotan II (Tan Jabs): Why They're Not Worth The Risk Melanotan peptide might seem like the cool thing to doit makes you look tan., But these unregulated injections come with real risks., They can cause unpredictable skin changes, including darkening of 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