Doctors warn against tan injections Melanotan injections are sold illegally and possibly unsafe Cancer Research UK Cancer News 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