Melanotan II, Barbie drug: Illegal injection could slowly kill people desperate for a tan news.com.au Australia's leading news site for latest headlines Health expert says Melanotan II darkens skin moles and can make melanoma hard to detect Herald Sun That quick tan injection is NOT worth the risk., Melanotan peptide injections stimulate pigment cells, and its use has been linked to rapid changes in moles, including the potentially fatal skin Melanotan What It Is and Its Relation to Skin Cancer Melanotan II (Tan Jabs): Why They're Not Worth The Risk 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