Tanning from the inside out = Highly Dangerous and Illegal! Many products advertised on social media platforms promising a tan from the inside out or a tan without sun such 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 may have heard about the latest trend tanning nasal sprays and injections. So how does it work and is it safe? Refs: Fjellhaugen Hjuler et al., 2014, Melanoma associated with the use of Nasal tanning sprays warning issued by Trading Standards