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Leigh Baxt
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Aug 31, 2026
Ep. 108: What To Know About The Peptide Boom: Separating the Science From the Hype with Dr. Leigh Baxt, PhD
L
27:59Leigh BaxtGUEST
side effects have been documented in this space? So first of all, there's not a lot of tracking systems in place.
L
28:07Leigh BaxtGUEST
I've talked to some other physicians about this whole compounding thing, which we can talk about later, and how there's no infrastructure to actually track things if that happens.
L
28:17Leigh BaxtGUEST
No one's measuring blood levels of peptides to correlate a dose with a response.
9 MINS LATER
S
37:07Do you see this getting better or getting worse? And please don't sugarcoat it for my own fear, but is there a world in which these will properly be researched and we will be able to really identify the safety concerns, remove those that should not be in anywhere near human use for safety concerns, remove the ones that just aren't effective and maybe find the one or two in the gold mine that that might actually have benefit? Do you see a world in which that happens or no? It's complicated.
Summer Rerun: Peptides: Know What Amino? (with Dr. Leigh Baxt)
40:23
S
16:50Sarah ScheinmanHOST
... clinical trials, that involves humans, and then there are lots of different phases of that as well.
L
16:58Leigh BaxtGUEST
In the, in the preclinical space, there are specific safety studies that you have to do depending on the drug modality.
L
17:05Leigh BaxtGUEST
So for small molecules, one of the things you'll hear about is something called safety toxicology and safety pharmacology.
L
17:11Leigh BaxtGUEST
Um, so for, for one of those, for the pharmacology study, you give kind of chronic dosing at an a do- at a dose in an animal that you could extrapolate to like a human dose, right? So like a low level, whatever.
23 MINS LATER

Jessica SteierHOST
Is there anything that we didn't discuss that you feel we'd be remiss if we didn't cover in this episode?
Mythbusting the Most-Hyped Peptides
27:57
Stuart PhillipsHOST
First thing he says, is this a good idea? Where should I buy these from? And what things do I have to look out for if I'm taking these things?
L
28:11Leigh BaxtGUEST
So the majority of those have very little human data, except for the ipamirelin.
L
28:17Leigh BaxtGUEST
There are some that have a specific indication in HIV that they've been approved for.
L
28:22Leigh BaxtGUEST
But nonetheless, the sort of broad claims made in the wellness community for these, none of those claims are proven in randomized human clinical trials.
L
28:31Leigh BaxtGUEST
For many of those, we don't even know the molecular target or have preclinical data packages.
L
28:36Leigh BaxtGUEST
There are red flags associated with many of the biological mechanisms inducing growth hormone.
9 MINS LATER
M
37:23Martin GibalaHOST
And so, you know, what's the future? So where is this peptide trend heading, do you think?
Ep. 97 - What you Really need to know about peptides with Dr. Leigh Baxt
L
13:57Leigh BaxtGUEST
Then we move into animal studies where we wanna make sure that this molecule does what we are hoping it will do based on our cellular data.
L
14:04Leigh BaxtGUEST
But we also do really important animal studies to de-risk, and these de-risking studies are based on the target and the kind of biology we're affecting.
L
14:12Leigh BaxtGUEST
And there are specific types of studies that you're required to do to show that you don't pose risk, and all of that has to be done before you submit what's called an investigational new drug, or IND package, which allows you to have approval for human trials.
L
14:27Leigh BaxtGUEST
So that IND package will show you that with animal studies we can show that this is gonna work.
16 MINS LATER
Dr. Leigh Baxt: The Peptide Craze
13:15

Therese MarkowHOST
We talk about it all the time, and it I'm not sure people know what's involved and why do we do them and who does them?
L
13:24Leigh BaxtGUEST
So randomized controlled clinical trials are really the basis of all of our human clinical studies that allow us to establish whether something is both safe and efficacious.
L
13:35Leigh BaxtGUEST
And by efficacious, I mean, does it work for the condition we're developing it for? The reason that we used randomized human clinical trials is because people are different and Everyone has a different lifestyle, different demographics, different diets.
L
13:50Leigh BaxtGUEST
So what you need to do is collect a huge group of people where you've recorded all of these details about those people.
L
14:00Leigh BaxtGUEST
And one of those groups is going to be treated with either a control, that could be a placebo, it could be nothing, it could be something different, or the thing that you're interested in developing.
13 MINS LATER
Peptides: Hype vs Science with Leigh Baxt, PhD
A
14:44AmyHOST
Like it doesn't mean that we're OK, we're good as humans.
L
14:48Leigh BaxtGUEST
It's not even I mean, if you're referring to the like regulatory changes for the peptides, which we're talking about, it's not even fast tracking, it's exemption.
6 MINS LATER
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21:02IrisHOST
Where did these come from?
246 - The No BS Truth About Peptides With Leigh Baxt
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4:09Leigh BaxtGUEST
But because these are academic researchers, they do not have the background or the tools to understand how to translate that into a therapeutic.
L
4:17Leigh BaxtGUEST
So we have a team of people who some have come from the pharmaceutical industry, the biotech industry, and academics, and together we synergize and we bring the tools and the knowledge that are needed to move something from, "This is really interesting research," to, "We can harness this therapeutically to actually benefit people." And I work specifically in the preclinical phase.
L
4:40Leigh BaxtGUEST
We're not doing any clinical research or human research, but I need to understand the whole span of the drug development process because to do the preclinical work well, you also need to know what comes next and understand how to position things well.
32 MINS LATER
Peptides: Know What Amino? (with Dr. Leigh Baxt)
39:29
S
15:03Sarah ScheinmanHOST
... clinical trials, that involves humans, and then there are lots of different phases of that as well.
L
15:11Leigh BaxtGUEST
In the, in the preclinical space, there are specific safety studies that you have to do depending on the drug modality.
L
15:18Leigh BaxtGUEST
So for small molecules, one of the things you'll hear about is something called safety toxicology and safety pharmacology.
L
15:24Leigh BaxtGUEST
Um, so for, for one of those, for the pharmacology study, you give kind of chronic dosing at an a do- at a dose in an animal that you could extrapolate to like a human dose, right? So like a low level, whatever.
24 MINS LATER

Jessica SteierHOST
Is there anything that we didn't discuss that you feel we'd be remiss if we didn't cover in this episode?
The Peptide Lie: What a Drug Developer Reveals About the Compounds Everyone Is Injecting | Dr Leigh Baxt
15:52
30:28

Simon HillHOST
How does that make you feel as someone who understands this entire process and is considering efficacy and safety?
L
16:01Leigh BaxtGUEST
I don't think-- You know, we have such an issue with trust right now, trust in science, trust in medicine, for a large variety of reasons.
L
16:09Leigh BaxtGUEST
But things like that, which I think are somewhat disingenuous, not saying what data does or doesn't support a claim that you're making, I don't think that helps the situation.
L
16:21Leigh BaxtGUEST
You have a financial incentive to sell that product, so of course you wanna make it sound appealing.
14 MINS LATER

Simon HillHOST
And they hear this conversation and they think, "Yeah, this is easy for you to say, but those studies are not coming down the pipeline." And they've heard that pharma, big pharma-Is not going to research these peptides, these natural compounds because they can't be patented, they can't be protected, and as a result, there's no money in it, so it never gets studied.