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 Targeting melanocortin receptors: an approach to treat weight disorders and sexual dysfunction Nature Reviews Drug Discovery Australians who use tanning products containing 'melanotan' are at risk of serious health problems. These products include nasal sprays and other injectable and ingestible tanning products, and are being illegally promoted and Warning issued over increased use of 'Barbie drug'