Nasal tanning sprays linked to skin cancer, trading standards officers warn Consumer affairs The Guardian Insights into Tanning Biology and Tanning Products JCAD The Journal of Clinical and Aesthetic Dermatology 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 ,