In the 1990s, researchers at the University of Arizona were testing Melanotan II as a tanning agent. During clinical trials, they noticed something unexpected: the compound was causing spontaneous erections in male MELANOTAN 2 10MG Beverly Hills Rejuvenation Center Melanotan Ii Synthetic Analogue Peptide Hormone Stock Illustration 1358045105 Shutterstock Health expert says Melanotan II darkens skin moles and can make melanoma hard to detect Herald Sun