Melanotan II urgent warning about tanning product pushed on social media news.com.au Australia's leading news site for latest headlines Understanding the Ingredients in Tanning Nasal Sprays 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 Nasal tanners claim to work by using Melanotan II, a chemical that darkens skin pigmentation. It is illegal to sell medicinal products containing Melanotan II in the UK but since the tanners are sold You Should Avoid Using Nasal Tanning Sprays