Viral 'Barbie drug' for tanning can cause brain swelling and even cancer, experts warn Nasal tanning sprays: unsafe and potentially harmful. Chartered Trading Standards Institute posted on the topic LinkedIn Targeting the central melanocortin system for the treatment of metabolic disorders Nature Reviews Endocrinology 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 Why Are People Injecting Themselves with Peptides? The New Yorker