In a conversation on the a16z podcast with Daisy Wolf, neuroscientist and Huberman Lab host Andrew Huberman spoke about the growing peptide craze, its risks, and where he sees it heading.
Huberman began by clarifying the term itself, which he believes is often misunderstood. “A peptide is just a short chain of amino acids that make up a protein. Insulin is a peptide,” he stated.
Huberman explained that the word “peptide” has started to function more like a cultural label than a scientific one. It is similar to how people associate the word “st*roids” with bodybuilders, even though many natural hormones like estrogen fall into that category.
During the conversation, he also talked about BPC-157, which is often promoted online as a powerful recovery aid. Huberman acknowledged that there is some scientific interest in it, but emphasized that most of the evidence is still limited to animal research.
Huberman acknowledged that some interesting findings exist, but emphasized that most of the evidence still comes from animal studies. “It may or may not accelerate healing in animal models,” he said.
However, he pointed out that certain biological effects appear fairly consistent. “It’s very clear that it can improve cartilage growth, nerve regrowth as well as vascular growth,” he explained, before highlighting a potential concern.
Increased vascular growth could be problematic in some scenarios, he noted, adding that it is “a little bit worrisome if you have a tumor. You don’t want to vascularize the tumor.”
Huberman also revealed that he had personally experimented with it, though he did not notice any clear benefit. “I didn’t have an injury. I didn’t notice that I recovered anymore quickly from exercise,” he said.
Huberman also discussed a category of peptides known as growth hormone secretagogues, which are popular among people interested in recovery, sleep, and anti-aging.
“There’s a whole category of what are called growth hormone secretagogues, which are very popular,” he said, listing peptides such as tesamorelin, ipamorelin, sermorelin, and MK-677.
These do not contain growth hormone themselves. Instead, they stimulate the body’s own production. As Huberman explained, “These all stimulate the pituitary to release growth hormone but they themselves are not growth hormone.”
One of the effects people often notice from these is improved sleep quality. According to him, they can increase restorative sleep, noting that “they will increase the amount of deep sleep that you get at night.”
Huberman also addressed melanotan, which is sometimes used for tanning and performance-related effects.
“Melanotan, which makes people tan from the inside, raises energy and libido dramatically, fat loss dramatically,” he said.
However, he warned that the appealing list of benefits can distract people from serious potential side effects. “This isn’t the kind of thing you do to like go on vacation,” he cautioned, noting that the effects may be more permanent than users expect.
He highlighted a particularly alarming complication that can occur in men. Melanotan carries “the risk for men of priapism,” he explained, describing it as “the last erection you may ever have.”
“It might last eight hours, but that might be the last one,” he added, noting that prolonged episodes can cause lasting damage to nerves and penile tissue.
Because it is is associated with tanning, fat loss, energy, and libido, he believes people sometimes underestimate the risks. “People hear erection, fat loss, energy, tan, like, oh great,” he said. “You got to be real careful with these things.”
Huberman also shared his experience with a lesser-known peptide called pinealon, which is sometimes used for sleep or cognitive enhancement.
When he tried it, the effect on REM sleep was dramatic. “It gave me three hours a night of REM sleep, which was pretty awesome,” he said, though he emphasized that there is still “very little human data” supporting its safety.
Another major concern Huberman raised involves where people obtain these peptides. Much of the market operates outside traditional pharma regulation.
He explained that gray-market suppliers often sell peptides labeled strictly for research use. “Gray market sources for research purposes only, not for human use, tend to be 99% purity,” he said.
However, the reliability drops significantly when moving into the black market. “Black market sources, when you hear Chinese peptides, are companies online,” he said, adding that buyers often have little certainty about what they are actually receiving.
“You have no idea if it’s retatrutide,” he explained, noting that at least gray-market suppliers typically provide some form of documentation or data sheet.
Despite the uncertainty and risks surrounding many of these today, Huberman believes peptides could eventually become part of a more personalized approach to medicine.
Looking ahead, he predicted that individualized combinations might one day be tailored to a person’s biology and health needs. “I think in five years you and I are going to have a little cocktail,” he said, imagining a future where a single inj*ction or pill contains a customized mix.
If that shift happens, he believes the stigma around peptides could fade. In that scenario, personalized peptide stacks might eventually become as routine as common supplements. As he put it, “I think all of that stuff is going to be commonplace, the same way that people are not afraid of vitamin D or they’re taking some creatine or magnesium.”
