Unlock Your Natural Glow with Melanotan and Say Goodbye to Hours Under the Sun Sponsored Content herald dispatch.com Change in moles linked to use of unlicensed sun tan jab The BMJ 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 Health expert says Melanotan II darkens skin moles and can make melanoma hard to detect Herald Sun