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 Melanotan is trending again. As a dermatologist, I strongly need to tell you , Its an unapproved injectable peptide, and were seeing:, nausea and flushing, darkening of existing moles, No, you don't need the 'Barbie drug' to tan, whatever TikTok says. Here's why melanotan II is so risky