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What's the deal with peptides? - Wellness, Actually with Emily Oster & Perry Wilson, MD | Wave AI Podcast Notes

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What's the deal with peptides?

Wellness, Actually with Emily Oster & Perry Wilson, MD

Thu Feb 19 2026

Summary

Podcast Summary: "What's the Deal with Peptides?"

Podcast: Wellness, Actually with Emily Oster & Perry Wilson, MD
Episode Date: February 19, 2026
Host: iHeartPodcasts

Episode Overview

This episode tackles the hype and science around peptides—a popular but often misunderstood topic in wellness circles. Emily Oster, an economist and data expert, and Dr. Perry Wilson, a physician, break down what peptides are, why they're everywhere on social media, and whether they actually do anything for your health. They distinguish evidence-based uses from the myth, caution listeners about risks, and run through listener questions on the so-called "age cliff." The discussion is frank, data-driven, and occasionally irreverent—perfect for listeners overwhelmed by wellness fads.

Key Discussion Points & Insights

1. What Are Peptides, Anyway?

[18:43]

Perry breaks down the science:

“Protein is the building blocks of our bodies… Peptides are little pieces of proteins, and the definitions vary, but most people say that peptides are somewhere south of 50 amino acids.” (Perry Wilson, [20:05])
There are nearly infinite possible peptides—literally as many as "the number of atoms in every star in our galaxy." (Perry Wilson, [21:54])
Key analogy: Imagine peptides as “keys” that fit “locks” (receptors) on your cells, causing different effects.

2. Why All the Wellness Hype?

Emily references a typical Instagram moment:

“I opened up my Instagram and the first thing I saw was someone who had two side by side pictures of her face… this is what happens after 12 weeks on peptides… you cannot open social media without hearing about peptides.” (Emily Oster, [18:58])
Influencers, bold claims, and rebranding of familiar substances (e.g., weight loss drugs) drive the buzz.

3. Real, FDA-Approved Peptides & Evidence-Based Uses

[25:55]-[30:13]

Collagen Peptides
- Moderate evidence supports topical collagen peptides for skin hydration/elasticity (but studies without industry funding show less effect).
- For joint pain: Some benefit, especially in athletes, shown in meta-analyses, but effects are modest.
- Quote:
  
  “I tell people… it’s not terribly expensive. If you feel like trying it, try it. Try to be honest with yourself if you think you really look better. If you don’t, save your money.” (Perry Wilson, [28:37])
Other Approved Peptides
- Tanning: Afamelanotide (FDA approved for rare diseases, but not as a tanning agent).
- Female sexual desire: Vyleesi, with mixed benefits and common nausea side effects.
- Peptide-based drugs: Insulin, GLP-1 agonists (e.g., semaglutide for diabetes/weight loss).
Emphasis: Legitimate peptides go through rigorous trials and FDA regulation.

4. The “Wolverine Stack” & Injected Peptides

[33:48]-[41:07]

Joe Rogan, among others, popularizes “the Wolverine stack” (BPC157 + TB500) for wound healing and “super recovery.”
Perry counters:

“The data for BPC157 is essentially entirely in mice and rats. …Some studies in mice and rats do show accelerated healing...But nothing in the people data that would say this should be widely adopted.”
“Anecdote is not data.” (Emily Oster, [40:34])
Risks of using animal data for human therapy: Most animal findings don’t translate; no long-term human safety data.

5. Risks & Regulatory Gaps

[41:07]-[54:47]

Oral Peptides: Generally a waste of money—destroyed by the stomach before absorption.

“Oral peptide consumption is basically going to be safe, you know, even if you are ingesting like bee venom, because it’s not effective.” (Perry Wilson, [43:01]) “It’s safe because it’s useless. Your stomach is eating it.” (Emily Oster, [43:05])
Injectable Peptides: Where real risk lies—especially if bought “online” or from “compounding pharmacies.”
- BPC157 is illegal to compound in the US; most online products come from overseas (often China) with no testing or regulation.
“When it comes to injecting things into your body, you don’t really want the Wild West.” (Perry Wilson, [47:39])
Possible Dangers:
- Allergic reactions (anaphylaxis can happen, especially after multiple injections)
- Autoimmunity (immune attacks on self-proteins)
- Contamination (e.g., with toxins, heavy metals)—usually not a problem with FDA-approved injectables but high risk for gray-market products.
Guidance for those considering peptides:

"If someone tells you they're getting some of these peptides… from a compounding pharmacy, they're not. It's not legal… what you do want is a certificate of analysis... you want… greater than 98% purity, endotoxin testing, heavy metal testing, sterility, and that the batch number matches." (Perry Wilson, [52:29])

6. Bottom Line: Separating Fact from Hype

[54:33]-[54:47]

Emily’s take-home:

“Don’t inject something in yourself that’s not FDA approved just because it worked on a rat.” (Emily Oster, [54:33])
Perry’s view:

“I’m not ready to give up on this, but there’s some serious snake oil vibes here.” (Perry Wilson, [54:42])

Notable Quotes & Memorable Moments

“It does not make hot young women pop out of your back. At least not yet.” (Perry Wilson, joking about peptide claims, [20:05])
“If we were mice, we would have solved, like, everything.” (Emily Oster, on translating animal research to humans, [37:59])
“When you see someone on the Internet and their skin is amazing and they tell you they took collagen, I’m telling you it’s that they have good genetics and/or are using a filter.” (Emily Oster, [32:48])
“Wolverine stack…that is amazing…as a superhero fan, that is great marketing.” (Perry Wilson, [47:01])
[Listener Question]: “Don’t inject something in yourself that’s not FDA approved just because it worked on a rat.” (Emily Oster, [54:33])

Timestamps for Important Segments

[18:43] – Start of the main peptide segment
[20:05] – “What is a peptide?” explained
[23:32] – GLP-1 and aspartame as peptide examples
[25:55] – Are peptides “safe because they’re natural?” Dispelled
[28:37] – Collagen peptides evidence & skepticism
[33:48] – The “Wolverine stack” and influencer hype
[35:55] – Animal vs. human studies, true limitations
[41:07] – Dangers of DIY peptides, oral vs injected forms
[47:01] – Regulatory issues: compounding & legality
[52:29] – What to check if you insist on using (certificate of analysis)
[54:33] – Host summary—what’s the “one thing” to remember
[58:08] – Listener mailbag: the “age cliff” and slow decline
[61:26] – Emily’s post-episode correction: “I don’t always follow evidence either”

Listener Mailbag Highlight

[58:08]-[62:23]

Question: Is there an “age cliff” in your 40s where everything goes downhill?
- Perry: Study shows some markers dip around 44, but data is limited and “mobility cliff” is likely more about changes in lifestyle and activity, not sudden biology.
- Emily: Biology rarely “cliffs,” it’s mostly slow decline.
- Fun back-and-forth about self-injuring male friends and their “return to lacrosse” phase.

Tone and Language Notes

Candid, irreverent, and accessible explanations.
Hosts frequently poke fun at both wellness fads and themselves.
Critical but not dismissive—recognize the appeal and desperation behind “trying anything” but urge caution and evidence.

In Summary

Main takeaway:
Peptides are a vast, diverse category—some are proven medical marvels (like insulin or GLP-1 agonists), but most wellness peptides are unstudied, overhyped, potentially risky, and often illegal to inject or sell. Oral “peptide gummies” are largely a waste of money. If you’re considering peptides, make sure they’re FDA-approved, and beware of products without real testing or oversight. As Perry sums up, “There’s some serious snake oil vibes here.” As Emily says, “Don’t inject something that’s not FDA approved just because it worked on a rat.”

Next week:
“What’s the deal with cold plunges and saunas?”

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Transcript

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Perry Wilson (8:43)

Yeah, I mean, to be honest, this is pretty weird. This is unusual. So why do we need an MRNA flu vaccine? I mean, the argument here is that our traditional flu vaccines, which are those egg based VACC vaccines, take about six months to make. And that means you're always sort of trying to like stay ahead of the flu, the flu eight ball, right. Like you start guessing what the flu strains are going to be in the future to grow up your vaccines. MRNA flu vaccine in theory can get spun up in a couple of weeks. That's the benefit of MRNA technology. You could potentially even like in real time keep up with the flu strains that are coming out. So there's definitely a reason to do this kind of study. Even though we have existing flu vaccines, this vaccine that Moderna put out, they had published already several studies, about 7,000 patients each demonstrating safety. But this 41,000 patient trial was for efficacy. Does it prevent the flu compared to not a placebo but the current active flu vaccine, one of these egg based vaccines. And in fact the rates of flu were significantly lower with the Moderna vaccine. They submit that data to the FDA and in theory an FDA advisory panel will review it, assess it for safety and efficacy, make a ruling that FDA then decides on this did not happen. The head of the vaccine division essentially of the fda guy named Vinay Prasad, apparently, according to New York Times Unilaterally decided not to review this data at all, so not to bring it to the peer review group in the first place. He his rationale was that the dose of the normal vaccine they gave was not high enough for older people who do better with a higher dose. So it was like not a good enough comparator is the argument. Here's the problem. If you're a big pharmaceutical company, generally you go to the FDA and this is what Moderna did before you do the trial and you say, hey, here's our design, here's our what? Here's our control group, here's our analysis. Are you okay with this? Because you don't want to spend $250 million if the FDA is going to say they're not okay with this. Right. So they did that. They went to the fda, the FDA said, sure, run your trial. You know, this looks like a good design. And now apparently one person, although obviously who knows what's going on, has after the fact been like, no, you know, moving the goalposts. This is like sort of classic Lucy picking up the football situation.

Perry Wilson (48:55)

That's what our GI tract does when we get what are called antigens, which are peptides or proteins or other things via another route, like the injection or sometimes the inhalation route. A whole different Immune reaction occurs, and that is an allergen forming immune reaction. It is worth noting that the first time you get stung by a bee is not when you have the anaphylactic response to a bee sting. If you're allergic to bees, it's the second time. Time. The first time the allergy starts to get learned and woken up, essentially. And then the second time you get stung, you have the anaphylactic shock. As I said, there's infinite peptides you could theoretically inject into you, and it is likely that some, at the very least, will cause severe allergies in some people. So be aware of that. Number two is what we call autoimmunity. So your immune system is this amazing thing that surveils all the cells in your body and decides, is this me or is this something else? And in general, if you're healthy, it looks at your cells and says, oh, yeah, this is me. I don't need to attack this. This is myself. We're okay. Autoimmunity is when the immune system starts to recognize something in your own body that is you, but it doesn't recognize it as you anymore, so it attacks it. And, you know, lupus, for example, is the. The prototypical, like autoimmune syndrome, where your immune system is attacking these various cells in your body. When you inject a protein into yourself, you form antibodies to that protein. That is how vaccines work. When we inject a COVID vaccine, antibodies form against the spike protein. And that works because the spike protein is not you. And so when the immune system sees the spike protein again, it can attack that many of these peptides are derived from human proteins. And if your immune system starts to recognize those peptides as foreign, there's a chance that they might start to attack your own proteins that contain those peptides as foreign. And that could be really bad. It could almost do the opposite of what you want these things to do. Right, because you want these peptides to stimulate, you know, this system. And now all of a sudden, you have antibodies that are directly attacking the system. That could be an issue in the long term.

Perry Wilson (52:29)

All right, Ben, what was up with G. Did you need to do that? Like, was she pressuring you? Okay, if you're going to do it. Okay. Realize that if someone tells you that they're getting some of these peptides like GPC157 from a compounding pharmacy, they're not. It's not legal, so it's coming from outside of the US So, so be a little skeptical of, you know, wherever you're getting them from, if you are getting that. And there are places that do a better job of trying to be reputable in this space. And what they do is they farm out the substance to an independent testing laboratory, which issues what's called a certificate of analysis, which basically says, like, we tested the stuff in here, and yes, it is what it says it is. The things you're looking for on a certificate of analysis, number one is purity. Is it actually, you know, is it, is it clean? Is it the stuff you want? You want basically greater than 98% purity to feel comfortable. Number two, you want testing for something called endotoxin. This is a bacterial byproduct that causes, causes sepsis and inflammation. You do not want endotoxin in anything you inject into your body. It's also the thing that causes toxic shock syndrome. You want heavy metal testing. So a lot of these that have come from China and other countries are contaminated with lead and other heavy metals. So you want to, you want the certificate of analysis to demonstrate there's no heavy metals there. You want sterility testing. So they've confirmed that it's sterile, it doesn't contain bacteria or anything. And finally you want to check the certificate analysis, which should list the batch number and the lot number against the one on the thing you're injecting or else. Right. It could just be referring to some other one that was tested years ago. And I know that sounds insane and maybe that more than anything else is going to convince people not to use these things, but I do think if, if all of these pieces are in place, you may be okay. I would not recommend long term use though because we really just don't know the effects. And I've got, I am quite concerned about allergy and autoimmunity with repeat. All right, Emily talked a lot here. What's your one thing about peptides?