The Peter Attia Drive - #387 - AMA #83： Peptides—evaluating the science, safety, and hype in a rapidly growing field

00:00:00.000 Hey everyone, welcome to a sneak peek, ask me anything or AMA episode of the drive podcast.

00:00:15.860 I'm your host, Peter Atiyah. At the end of this short episode, I'll explain how you can access

00:00:20.300 the AMA episodes in full, along with a ton of other membership benefits we've created,

00:00:24.920 Or you can learn more now by going to peteratiyamd.com forward slash subscribe.

00:00:30.640 So without further delay, here's today's sneak peek of the Ask Me Anything episode.

00:00:38.820 Welcome to Ask Me Anything.

00:00:40.820 In today's AMA, we take on one of the most requested and most confusing topics we've ever covered.

00:00:47.860 Peptides.

00:00:48.980 Peptides sit at the intersection of biological plausibility, clinical promise, and rampant

00:00:55.020 commercialization.

00:00:56.280 They're often marketed as cutting-edge, regenerative therapies for everything from muscle repair

00:01:01.000 and longevity to cosmetic enhancements.

00:01:03.240 But the reality is that the peptide ecosystem is sprawling, poorly regulated, and filled

00:01:09.080 with claims that range from legitimate to completely ungrounded.

00:01:13.360 So the goal of this episode is not to promote peptides or dismiss them as a category, but

00:01:18.140 to give you a framework for evaluating them. Because as you know, we love us some frameworks

00:01:23.120 over here. We walk through what peptides are, what questions you should ask before putting

00:01:28.380 any peptide or any drug into your body, and how to think about the strength of evidence,

00:01:33.280 the safety profile, and the difference between science and marketing hype. So specifically,

00:01:38.860 we're going to discuss why peptides have become such a dominant topic in the wellness and longevity

00:01:43.620 culture, the differences between FDA-approved peptide therapeutics and quote-unquote peptides,

00:01:50.500 which are what most people refer to with quotes in the biohacking world, a framework for evaluating

00:01:56.500 any peptide mechanism, intended effects, safety, dosing, and alternatives. And then we're going to

00:02:02.440 run our framework through a handful of examples in detail. SS31, talk about the background,

00:02:09.480 the biology, and the types of conditions it has been studied for. Melanotin-2, receptor activity,

00:02:15.700 common claims, related FDA-approved compounds in the same pathway. CJC-1295, I'm going to talk

00:02:22.000 about growth hormone signaling, why it has been studied in humans, what it's been studied for,

00:02:27.320 and how dosing is typically approached. Of course, BPC-157, no discussion on the topic would be

00:02:32.220 complete without that. The origin story, the proposed mechanisms, and the nature of the animal

00:02:36.600 in human evidence that's often cited. We're going to talk about the role of patents and the

00:02:40.620 incentives in drug development and why some compounds do or don't advance through formal

00:02:45.400 clinical pipelines. We're going to compare peptide evidence standards to other widely

00:02:50.260 discussed interventions that fall into high interest in complete data categories. We're

00:02:55.440 going to talk about how peptides are manufactured and sold in the gray market and what the research

00:02:59.680 use only designation actually means, what third party testing can evaluate and what it doesn't

00:03:05.540 capture, talk about oral peptides, digestive breakdown, absorptive challenges, and what we

00:03:10.820 know from pharmaceutical examples, talk about what needs to happen for peptides to become more broadly

00:03:16.340 usable therapies, and where peptide therapeutics may expand in the future, and what areas of

00:03:21.720 medicine might be most actively and positively benefited right now. Peter, welcome to another

00:03:33.440 AMA. How are you doing? I'm doing great, man. How are you? I'm doing good. For today's AMA,

00:03:39.940 we are going to be talking about peptides. So peptides are a topic that we get asked about

00:03:44.760 an insane amount. You see so much content on there. Even today, going through our email inbox,

00:03:51.340 we had two emails asking us to talk about peptides. So it's a topic we see over and over.

00:03:56.640 And our goal with this episode is not to promote, dismiss peptides overall, but just to give people

00:04:03.120 a framework and how to think about them, which is what are peptides, where is the science solid,

00:04:08.760 weak, or non-existent, and how to evaluate the claims that people make. With this, we'll walk

00:04:15.100 through a core set of questions that apply to any peptide and we'll apply it to a variety of

00:04:20.460 peptides to kind of walk through some of the most popular ones, which is whether we know there's a

00:04:25.440 mechanism of action, what do we know about safety and dosing, is there any evidence that it can be

00:04:31.920 helpful in humans? How does someone compare the risks and the potential benefits? And are there

00:04:39.260 any other legitimate approved solutions that are available? And then at the end, we'll also zoom

00:04:44.560 out and talk about the gray market space for peptides, including how people should think

00:04:49.840 about purity, sourcing, et cetera. And then we will truly end on the potential future of peptides

00:04:57.540 and what we would need to know what new information would have to come out to really understand where

00:05:03.060 these could be promising. A lot to cover, a lot of different things we said, anything you want

00:05:09.560 people to know before we get rolling. No, I think you've covered it. I don't think there's a topic

00:05:14.380 I get asked about more today and probably for the last six months than this topic. I would just add

00:05:21.860 that the reason it has taken us so long to come out with this AMA is we wanted to do this justice.

00:05:29.160 We don't do anything in moderation on this podcast except for moderation. There's a bar

00:05:33.600 that just had to be cleared. I hope we're about to clear it for you as a listener. And it just took,

00:05:40.680 I'm actually kind of afraid to ask how much time it took of our research team to help me get ready

00:05:47.100 for this. So let's dive into it. Perfect. I think we got to start off with defining

00:05:52.280 what are peptides. By the way, it's funny. My wife asked me this over the weekend. We were sitting

00:05:58.620 there. She was asking me a peptide question and it was like we were having dinner with the whole

00:06:02.520 family. And of course, naturally the eight-year-old and the 11-year-old are like, what are peptides?

00:06:07.820 And so I'm explaining to them what peptides are in anticipation of this discussion. So look,

00:06:12.360 There's nothing magical here. A peptide, it gets talked about in this health and wellness space like it's something magical or new, but it's not. A peptide is a short chain of amino acids. I don't think there's a real clear definition of what constitutes a peptide versus a protein. Clearly, once you're into the thousands of peptides, you're clearly talking about proteins.

00:06:34.460 I would say I've read definitions that would suggest up to 60, up to 100, I don't know. But

00:06:40.020 the point is, it's pretty small. So a short number, relatively short number of amino acids strung

00:06:46.060 together forms a peptide. Now, by the way, sometimes it's so short that it's literally just a straight

00:06:52.020 line of amino acids. And other times they form more complex structures, they form rings and

00:06:57.360 things like that. Again, these are things that the body naturally produces. So there are many

00:07:03.060 peptides that are produced naturally. They serve all sorts of essential functions. They act as

00:07:07.900 signaling molecules, neurotransmitters. They act to facilitate the transport of molecules. They

00:07:13.320 sometimes can act as antioxidants. So some of these peptides are going to sound really familiar.

00:07:18.920 Some of the most important things that people have heard of, like endorphins, insulin, GLP-1,

00:07:24.240 these are all peptide hormones. Now, of course, some of these things can be produced synthetically.

00:07:29.080 So we're able to create peptide-based therapies that can mimic the endogenous or body-produced

00:07:35.640 peptide.

00:07:36.620 So again, I would say here the single most important of these would be insulin.

00:07:40.520 Insulin was discovered roughly 100 years ago, and it was clear that in a disease called

00:07:46.480 type 1 diabetes that people who lacked insulin because their beta cells were being attacked

00:07:51.560 by their immune system were going to die.

00:07:53.260 And if we couldn't give them some form of insulin, and initially that was done by taking

00:07:57.960 insulin from dogs or pigs, that they were going to be in trouble. But ultimately, of course,

00:08:02.960 once insulin could be synthetically produced, you could create a therapy to save the life of

00:08:08.260 somebody with type 1 diabetes. More recently, of course, people will be very familiar with the

00:08:13.200 GLP-1s. We're going to talk about that because in the GLP-1 world, we're not typically giving

00:08:17.920 people the exact same peptide, but we'll come back to that. So anyway, that's maybe more than

00:08:23.140 you want to hear, but we'll start with that as a definition. It's good for people to hear

00:08:27.860 how many different molecules the word peptides can cover. But I think a lot of times when people

00:08:33.480 are asking questions about peptide supplements, traditionally it seems like they're not always

00:08:37.780 referring to insulin or even GOPs. And so for the sake of this conversation today and not having

00:08:45.360 18 hours to go over everything, what is your goal with the peptides you want to make sure we talk

00:08:50.760 about today? Well, it's interesting. We're going to actually talk about these a little

00:08:55.000 differently. So we're definitely not going to talk about insulin today. We will talk a little

00:08:59.300 bit about GLP-1, but from a sort of regulatory standpoint. In medical terms, I would say a

00:09:04.540 peptide broadly refers to an FDA-approved therapeutic molecule, again, like insulin or

00:09:11.280 GLP-1 drugs. But I think in the more colloquial sense, the word peptide, as we're going to talk

00:09:18.040 about it today, is more of the biohacking, pop science, bro science connotation that refers to

00:09:24.820 various therapeutics that are touted for various benefits, often related to, quote, longevity and

00:09:31.100 beauty and tissue healing recovery performance. But they don't have an FDA approval at all,

00:09:38.060 or they're being just used off-label for any of these purposes. So when we're going to talk

00:09:42.640 about peptides, we're going to be talking about things that are generally administered via

00:09:46.820 injection that have become popular despite a lack of scientific or medical consensus on their

00:09:53.880 efficacy. These are going to be things that are virtually all available through gray market means.

00:09:59.600 And again, we're going to talk about what that actually means and why that's necessary. By

00:10:04.580 necessary, I mean why that's the means by which you would acquire these things, in which their

00:10:09.060 sale isn't technically illegal, but by marketing them for, quote, research use only, and I'm being

00:10:16.520 very clear in that language. They're not approved for human use, but everybody understands that

00:10:22.460 they are indeed being used by people. Yeah. And given that a lot of these are

00:10:27.380 gray market, not FDA approved peptides, how do you recommend people start to think about them

00:10:33.300 and start to evaluate the potential of whether they can be helpful or not?

00:10:38.260 I think we want to talk about this across the entire spectrum of efficacy and safety,

00:10:43.200 but I don't think we want to even entertain the question, do peptides work as a category? The

00:10:49.220 answer is obviously they do. Again, we'll point to GLP-1 agonists, insulin, and even longer proteins

00:10:57.720 that are probably on the verge of still being peptides like HCG that are clearly clinically

00:11:03.760 efficacious. So I think what we want to really do is take an unbiased approach and evaluate whether

00:11:11.920 any given peptide has enough evidence for its safety and its actual efficacy, examine the

00:11:20.260 regulatory structure of it and ask the question, is there a justification for real world use?

00:11:25.820 And again, I think this is most helpful when evaluating things through the lens of these

00:11:31.380 unregulated peptides. And that's really where we're going to focus today. That's the value I

00:11:36.540 think we can bring in this podcast to this discussion. So again, whether you're FDA approved

00:11:41.380 or not, I think you should always be asking the same question of anything you put in your body.

00:11:48.140 Let's just take a few steps back and not even think about this through the lens of a peptide.

00:11:52.360 If you're going to put any drug in your body, you should be asking these questions and the

00:11:57.020 answers to these questions should be kind of informing your decision-making. So the first

00:12:02.560 question is, is there a viable mechanism of action? There's very technical ways to think

00:12:08.760 about this. I'm not interested in vague theories like, oh, it boosts energy production. That's not

00:12:14.480 a mechanism of action. What we want to know is, do we have a defined course of mechanistic steps

00:12:20.260 that might logically lead to an intended effect? So this is very important. In fact, the list of

00:12:27.220 drugs that are approved by the FDA for which we don't have a mechanism of action is very small.

00:12:34.940 It's estimated to be no more than 3% of total drugs that are approved, and this includes

00:12:41.900 over-the-counter drugs. If there's no mechanism of action, you should be very skeptical of a drug

00:12:48.980 or supplement. This is everything that you get a prescription for and everything that is sold

00:12:53.660 legally over-the-counter, less than 3% of these, we don't understand the mechanism of action.

00:13:00.540 Now, there are some interesting examples. So Tylenol is an exception. Believe it or not,

00:13:05.180 we don't actually know how Tylenol works. We don't know how lithium works. We did a newsletter on

00:13:10.800 this somewhat recently, talking about lithium for potential cognitive benefits. We don't actually

00:13:15.280 know how it works. There's some speculation, but we don't know. Something like Mucinex,

00:13:18.760 we don't really know how that works. So there are exceptions out there, but they're very rare.

00:13:23.060 Another question you should be asking is, what do we know about the downstream effects of this

00:13:30.020 in healthy individuals? That is the intended effect. So this is another way of saying,

00:13:35.760 what is the efficacy of this drug, in particular in healthy humans or in the patient population

00:13:42.460 that we're interested in addressing this in? Of course, another question is, what do we know

00:13:47.880 about safety. And that usually means starting in animals, but eventually you have to figure out

00:13:53.600 what the safety looks like in humans. And of course, that's also a function of dose

00:13:58.940 and usage pattern. How do you put these things together? Well, how do you then weigh the

00:14:04.900 potential risks of the potential side effects with the intended benefits of the drug? Take

00:14:12.440 something like an antibiotic. Antibiotics have lots of side effects. Some of them can be really

00:14:16.740 quite devastating. But we also know that they have really important intended downstream effects.

00:14:24.140 As such, nobody would ever suggest you just take antibiotics willy-nilly. That would not make sense

00:14:29.760 to ward off any potential bacteria in the room. Rather, we reserve them for when the risk of not

00:14:36.500 taking the antibiotic is high enough. Another question I think we always want to be asking is,

00:14:41.160 are there legitimate approved alternatives available? This is actually specific to the

00:14:46.140 peptide question. Because again, once you start to talk about things that are gray market, where you

00:14:52.560 have no way of scrutinizing the legitimacy of a compound, you have to ask yourself, well, if I'm

00:15:00.020 going to take this, should I be at least considering something that is FDA approved that might have the

00:15:05.520 same risk and benefit profile? Once you answer all of these questions, you can put any one of

00:15:12.420 these peptides into basically a group of buckets. You know me, I love my frameworks. So this is kind

00:15:19.360 of a framework that we've come up with that I think you could put any peptide into. And there's

00:15:23.580 four buckets. So bucket one will be, you've gone through this line of inquiry and you really can't

00:15:30.520 make a compelling case for it if you're being honest. You can be dishonest and come up with

00:15:35.280 compelling cases for anything. But if you're being honest, intellectually honest, there would be no

00:15:39.480 use case for this peptide. So these would be things for which you have no viable mechanism

00:15:43.820 of action. You just don't have data or there's some theoretical mechanism or there's existing

00:15:49.720 data that actually refute it. You don't have any data in humans or you might even have negative

00:15:55.180 data in humans. Another thing to look for with these peptides is when you get a lot of shifting

00:16:00.100 goalposts for the alleged benefits. These are peptides where they tout one set of benefits

00:16:06.320 and then they, a couple of years later, come out with a new set of benefits and then a new set of

00:16:10.560 benefits and they're just kind of making up a new story all the time. Then you have your bucket two

00:16:14.140 peptides. Here you have a viable mechanism, but the compound has never entered clinical trials

00:16:19.600 or if it did enter human clinical trials, it was abandoned. There's no real continued interest

00:16:25.080 from pharma. So we're going to talk about some examples there. Your bucket three peptides have

00:16:29.980 a viable mechanism of action. They might even be currently in human clinical trials. They might

00:16:36.080 even be approved for indications other than those that are intended in the general use population.

00:16:43.300 You do have safety and efficacy data, though not necessarily in the population you're interested

00:16:48.780 in or for the indication you're interested in, but they don't have an approved version that exists

00:16:53.320 for the current popular use. And we're going to talk about examples in all of these.

00:16:58.460 Finally, the fourth bucket, these are basically peptides that are stolen FDA-approved drugs or

00:17:03.460 hormones. So they're basically peptides that are being sold that are being touted as exact replicas

00:17:10.420 of approved drugs, but they're being sold illegally via research purposes only. So we're

00:17:16.580 going to talk through a handful of examples in a lot of detail to sort of A, cover those peptides

00:17:24.220 because these are very popular ones. That's why we've chosen them. But also to kind of lay out

00:17:29.100 the thinking that we'd like you to do as you embark on this journey yourself. I'll point out

00:17:34.680 that in the show notes, we're also going to include kind of a database we've put together

00:17:40.220 of, I would say, oh, I don't even know. I've lost track. Maybe 20 other peptides that we've come up

00:17:47.000 with our own point of view on. Okay. So what are the ones we're going to start on? We're going to

00:17:50.600 kind of go a little deep into the following. SS31, Melana10 to CJC1295, and BPC157. Why did we pick

00:18:02.920 those four? They're incredibly popular. They're probably the ones I get asked about the most

00:18:08.360 from patients, friends, anybody. And our goal is to evaluate them through the lens of these

00:18:13.460 questions we just laid out. What are the clinical claims? What's the evidence? What are the risks?

00:18:17.520 What are the practical considerations, et cetera? So hopefully this gives you sort of a framework

00:18:21.760 to evaluate any other peptide, including the ones that we will cover later on. We're then going to

00:18:28.520 talk about these questions, the gray market peptides, and talk about how these things are

00:18:34.980 subject to some regulatory oversight, et cetera. Let's just dive into it. Let's do it. Let's start

00:18:40.800 with the first one, SS31. Let's start with the question, is there a viable mechanism of action

00:18:47.340 that we know for it. Thank you for listening to today's sneak peek AMA episode of The Drive.

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The Peter Attia Drive - April 13, 2026

#387 - AMA #83： Peptides—evaluating the science, safety, and hype in a rapidly growing field

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