Uploaded May 2026 | Updated September 2026, 3 weeks ago
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.
0:00 Introduction: The Peptide Hype
1:05 What Are Peptides?
2:31 GLP-3 (Retatrutide): The Next Weight-Loss Drug?
5:44 Compounding Pharmacies vs. Gray-Market Peptides
8:17 The "Peptide Washing" Problem
11:16 Risks of DIY Peptide Stacking
13:55 Why People Turn to Gray Markets
15:09 RFK Jr., FDA and Peptides
17:54 We Need More Nuance
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
theverge.com/column/866577/optimizer-peptides-compounding-pharmacies-glp-3-retatrutide-influencers-wellness-wild-west
“I don’t think Gwyneth Paltrow knows what a peptide is,” by Victoria Song in the Verge. Published online April 24, 2026
theverge.com/column/918084/optimizer-gwyneth-paltrow-peptides
Peptides promise longevity and healing. Does the science back them up?
scientificamerican.com/article/the-science-behind-the-peptide-craze
Where do you stand on the use of peptides for health and wellness?
scientificamerican.com/discussions/where-do-you-stand-on-the-use-of-peptides-for-health-and-wellness
E-mail us at sciencequickly@sciam.com if you have any questions, comments or ideas for stories we should cover!
Discover something new every day. Subscribe to Scientific American: scientificamerican.com/getsciam
And sign up for Today in Science, our daily newsletter: scientificamerican.com/account/email-preferences
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.
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.
0:00 Introduction: The Peptide Hype
1:05 What Are Peptides?
2:31 GLP-3 (Retatrutide): The Next Weight-Loss Drug?
5:44 Compounding Pharmacies vs. Gray-Market Peptides
8:17 The "Peptide Washing" Problem
11:16 Risks of DIY Peptide Stacking
13:55 Why People Turn to Gray Markets
15:09 RFK Jr., FDA and Peptides
17:54 We Need More Nuance
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
theverge.com/column/866577/optimizer-peptides-compounding-pharmacies-glp-3-retatrutide-influencers-wellness-wild-west
“I don’t think Gwyneth Paltrow knows what a peptide is,” by Victoria Song in the Verge. Published online April 24, 2026
theverge.com/column/918084/optimizer-gwyneth-paltrow-peptides
Peptides promise longevity and healing. Does the science back them up?
scientificamerican.com/article/the-science-behind-the-peptide-craze
Where do you stand on the use of peptides for health and wellness?
scientificamerican.com/discussions/where-do-you-stand-on-the-use-of-peptides-for-health-and-wellness
E-mail us at sciencequickly@sciam.com if you have any questions, comments or ideas for stories we should cover!
Discover something new every day. Subscribe to Scientific American: scientificamerican.com/getsciam
And sign up for Today in Science, our daily newsletter: scientificamerican.com/account/email-preferences
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.
