Melanotan II (Tan Jabs): Why They're Not Worth The Risk Health expert says Melanotan II darkens skin moles and can make melanoma hard to detect Herald Sun Is Melanotan the New Solarium for a Perfect Tan? 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 longer lasting than It's a week of trending media talk about the dangers of Melanotan. I remember fielding a media interview about Melanotan 7 8 years ago. This trend has been around for a while, but