Your body already makes a hormone that tells your skin to tan. Melanotan 2 is a synthetic peptide engineered to mimic that hormone but in a version that's more potent and Melanotan: Dangerous 'Barbie drug' nasal spray TikTok trend prompts new TGA warning Exclusive 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 Peptide Therapy Beyond Wellness Personalized Treatment Plans