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 Dangerous' tanning products promoted by influencers Dangerous' tanning products promoted by influencers Over a quarter of Welsh people are regularly using sunbeds Melanoma Focus Australia should stop beefing up its steroid laws that won't help users