Health expert says Melanotan II darkens skin moles and can make melanoma hard to detect Herald Sun 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 (acetate) (MT II) Cayman Chemical Emerging Threat: Melanotan, Repackaging, and Online Sales UK Australia Best Sells Extreme Rapid Tan Nose Spray Nasal Tanners Double Strength for Self Tanning Nasal Spray Tan Melanotan II Best Sells Extreme Rapid Tan Nose Spray Nasal and Melanotan