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 Dangerous' tanning products promoted by influencers Melanotan II Wikipedia Change in moles linked to use of unlicensed sun tan jab The BMJ No, you don't need the 'Barbie drug' to tan, whatever TikTok says. Here's why melanotan II is so risky