Health expert says Melanotan II darkens skin moles and can make melanoma hard to detect Herald Sun Melanotan II Self Tanner Dark Skin Sun Tanning Spray Tanning Nasal Spray Melanotan II and Mt 2 Tanning Spray Nasal price 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 (Tan Jabs): Why They're Not Worth The Risk What is Melanotan II the drug that the TGA urges consumers to avoid?