Influencers are obsessed with peptides. What does the science say?

Peptides are everywhere right now—from weight-loss drugs to TikTok wellness hacks—but the science hasn’t caught up with the hype. Journalist Victoria Song joins Science Quickly host Rachel Feltman to break down what peptides actually are, why influencers are promoting “research-only” versions you can buy and inject yourself, and what risks are posed by this growing gray-market trend. From misleading marketing to real safety concerns, we unpack the Internet’s latest wellness obsession.  Recommended Reading: “Influencers are pushing suspicious peptides. How much are you willing to risk?” by Victoria Song in the Verge. Published online January 23, 2026 “I don’t think Gwyneth Paltrow knows what a peptide is,” by Victoria Song in the Verge. Published online April 24, 2026 Peptides promise longevity and healing. Does the science back them up? Where do you stand on the use of peptides for health and wellness? E-mail us at [email protected] if you have any questions, comments or ideas for stories we should cover! Discover something new everyday: subscribe to Scientific American and sign up for Today in Science, our daily newsletter. Science Quickly is produced by Rachel Feltman, Fonda Mwangi, Sushmita Pathak and Jeff DelViscio. This episode was edited by Alex Sugiura, with fact-checking by Shayna Posses and Aaron Shattuck. Our theme music was composed by Dominic Smith. Learn more about your ad choices. Visit megaphone.fm/adchoices