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, Melanotan II is the product that's been dubbed the "Barbie drug" on social media, and promises to give users a tan without the sun but it can have serious side effects including, in rare cases, Urgent warning over illegal 'Barbie drug' TikTok trend 7NEWS Dangerous 'Barbie drug' Melanotan II sparks crackdown on social media influencers ABC News Viral 'Barbie drug' for tanning can cause brain swelling and even cancer, experts warn