Sun and Skin: From Burns to Melanoma, What Every Clinician Needs to Know and Share 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 and the Posterior Reversible Encephalopathy Syndrome Annals of Internal Medicine Melanotan 2 Injectable Peptide