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 Nasal tanning sprays linked to skin cancer, trading standards officers warn Consumer affairs The Guardian What is Melanotan II the drug that the TGA urges consumers to avoid? How to Use Tanning Nasal Spray: What to Know Sunbeds.com