Nasal tanning sprays linked to skin cancer, trading standards officers warn Consumer affairs The Guardian 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 Melanotan II Erectile Dysfunction: What the Evidence Shows and Practical Considerations What is Melanotan II the drug that the TGA urges consumers to avoid?