Frontiers Effects of Combined Oxytocin and Beta 3 Receptor Agonist (CL 316243) Treatment on Body Weight and Adiposity in Male Diet Induced Obese Rats 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 Melanotan II Safety: Tanning Injection LIVV Natural 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 IMB issues warning over tanning injections at salons or bought on internet The Irish Times