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 Tan without frying in the sun? Yep. , Melanotan II boosts your bodys own melanin production, giving you a natural bronze with less UV exposure. Plus, it comes with some surprising extra benefits , Melanotan Side Effects What Researchers Must Know Melanotan What It Is and Its Relation to Skin Cancer