The Peptide Lie: What a Drug Developer Reveals About the Compounds Everyone Is Injecting | Dr Leigh Baxt

The Proof with Simon Hill

Simon Hill

Nutrition, Education, Self-improvement, Health & Fitness

4.9 • 3.1K Ratings

🗓️ 21 April 2026

⏱️ 48 minutes

🔗️ Recording | iTunes | RSS

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Summary

Peptides are being marketed as solutions for everything from injury recovery to longevity, but what does the science actually say? In this episode, Dr Leigh Baxt joins me to break down what peptides are, how drug development really works, and why so many of the claims circulating online are running far ahead of the evidence. We explore the difference between approved peptide medicines and unregulated products sold online, why anecdotes are not enough, and what people should understand before putting these compounds into their bodies. What We Cover What peptides are and why they are not new FDA-approved peptide drugs versus unregulated peptides sold online Why scientists are concerned about the current peptide boom How drugs are developed and why most ideas fail Why animal and cell studies are not enough to establish safety and efficacy The problem with using “natural” as a proxy for safe How to think critically about peptide marketing and anecdotal claims This is an important conversation for anyone trying to make sense of the peptide boom and separate genuine science from wellness hype. To learn more from Dr Leigh Baxt, follow her on Instagram at @sciencemomscicomm. I also recommend exploring Unbiased Science, where science communication is made far more accessible for the public. You can follow the project on Instagram, Threads, Facebook, LinkedIn, X, subscribe on Substack, and watch on YouTube. The views expressed are her own and she is not representing her employer. Intro (00:00) Stanford Expert Breaks Down the Peptide Hype (00:53) The Skill Set Behind Real Drug Development (05:09) FDA Approved vs Research Only Peptides Explained (08:03) Why Most Drug Candidates Never Become Medicine (11:06) Peptide Reclassification What Changes and What Doesn't (15:59) The Biological Risks Nobody Mentions About Peptides (20:36) Why Natural Peptides Are Not Necessarily Safe (23:00) What Safety Tests Drugs Must Pass First (28:51) Accepting Unknown Risk What That Actually Means (33:31) How to Find Credible Health Experts Online (36:13) Why Drug Development Always Requires A Team (39:19) Want to support the show? The best way to support the show is to use the products and services offered by our sponsors. To check them out and enjoy great savings, visit theproof.com/friends. You can also support the show by leaving a review on the Apple Podcast app and sharing your favourite episodes with friends and family. This episode is brought to you by: 38TERA Consider 38TERA's DMN prebiotic supplement a daily multivitamin for your gut. Formulated by yours truly and gastroenterologist Dr Will Bulsiewicz. Use code THEPROOF for a discount at checkout. 38Tera ships to the United States, Australia, and New Zealand. Function Health Take charge of your health with advanced blood testing and personalised insights. Function Health offers a practical way to track key health markers such as cholesterol, blood sugar, and more. Learn more and join at functionhealth.com/simonhill for a $25 credit toward your membership. Only available to those living in the United States. Function Health ships to 48 U.S. states, excluding Rhode Island, Hawai‘i, and Puerto Rico. Cozy Earth Cozy Earth’s sheets are designed to keep you cool by wicking heat and moisture away from your body, helping you sleep deeper and wake less. Get up to 20% off at cozyearth.com with code THEPROOF. Cozy Earth ships worldwide. Eight Sleep Upgrade your sleep with the Pod 5 Ultra by Eight Sleep. Clinically validated to deliver up to 1 extra hour of quality sleep per night through temperature control and biometric tracking. Use code THEPROOF for $350 off at eightsleep.com/theproof. Try it risk-free for 30 days, with worldwide shipping. Eight Sleep ships to the U.S. (excluding Alaska, Hawaii, and territories), Canada, Mexico, most of the EU, the U.K., Australia, the UAE, Saudi Arabia, and Switzerland. ProLon Ready for your own reset? For a limited time, ProLon is offering The Proof listeners 15% off sitewide plus a $40 bonus gift when you subscribe to their 5-Day Program. Visit ProLonLife.com to claim your discount and bonus gift. ProLon ships within the United States. WHOOP Whoop, the most advanced fitness and health wearable available. Your personalised fitness and health coach to recover faster, sleep better, and train smarter. Claim your first month free on join.whoop.com/simon. Whoop ships to 56+ international markets, including the US, Canada, most of Europe, Australia, New Zealand, UAE, Singapore, and parts of Asia. Simon Hill, MSc, BSc (Hons) Creator of theproof.com Host of The Proof with Simon Hill Author of The Proof is in the Plants Subscribe & Connect: YouTube Apple Podcasts Spotify Instagram: @simonhill Twitter: @theproof Facebook: The Proof with Simon Hill

Transcript

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0:00.0	Here's something that will surprise you.
0:03.0	The compounds being sold right now as peptide therapies for healing, for performance, for longevity.
0:09.0	Most of them carry a label that says, for research purposes only, not for human use.
0:16.0	And yet people are injecting these anyway by the millions.
0:19.0	Today I'm talking to someone who understands better
0:21.8	than almost anyone what that label actually means and what it means that we're ignoring it. Dr.
0:28.9	Lee Baxe has a PhD in microbiology and immunology from Stanford and she leads drug development
0:35.6	at Memorial Sloan Katering Cancer Center.
0:38.7	She is by no means anti-peptide, but she does have questions, and so should we.
0:44.7	With that, please enjoy my conversation with Dr. Lee Baxed.
0:53.4	You've been pretty vocal recently on social media about all things peptides.
1:01.2	At a high level here to begin this conversation, what's going on?
1:05.3	What's concerning you?
1:06.1	Why did you take to social media to share some of your thoughts?
1:09.7	Well, I think a little background on kind of why I'm even on social media in the first place would help. I'm a mid-40s, mom of two, I'm a scientist, my parents were a scientist and a doctor, they're both retired. My husband is a scientist. So this is very much a world that I've grown up in. And I've never seen anything happen in this world, like, is happening now.
1:28.0	I've never been through political administration that impacted my life and the way this has.
1:32.1	Last year alone, my husband had four out of his five NIH grants frozen or canceled.
1:36.5	The not-for-profit I worked at was actually shut down. I was able to find a new role. I was very
1:40.9	lucky. But those types of things are just causing this kind of
1:45.0	dystopian, like existential crisis in science. I've never seen anything like it. And I think
1:49.7	as scientists, we have a responsibility to explain science in a way that's accessible to everyone.
1:55.3	And instead of reading depressing articles or seeing things every day, I thought it was a better
	...

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