Inside the booming, gray-market world of injectable peptides

Injectable peptides are all the rage for many health-conscious Americans, thanks in part to the hype coming from the nation’s top health official. But enthusiasm might be outpacing regulatory controls and public understanding of what these products truly are.

Peptides, which are combinations of amino acids, are easy to buy. Store shelves are lined with products touting various health benefits: Collagen peptides to enhance skin elasticity, muscle recovery peptides for after workouts and “Botox in a bottle” to relax facial muscles peptides, among many others. 

But in certain corners of the internet, there are communities of people who take this a step further, sourcing raw, research-grade peptides from dubious sources so they can reconstitute them at home and inject themselves with the aim of improving their health or altering their appearance.

The Hill explored these shady corners of the online peptide market for this article, engaging with vendors promising pure peptides but using fake profile pictures and selling goods not meant for human consumption. It even placed an order for a vial of peptides, labelled not for human consumption but touted for its health benefits. 

Skyrocketing Google searches for “peptide” and associated compounds underscore the exploding market for them. And recent actions by federal regulators are likely to only enhance this growing interest.

Health and Human Services (HHS) Secretary Robert F. Kennedy Jr. describes himself as “a big fan of peptides” and has promised action to expand access to them.

What are peptides?

Strictly speaking, peptides are protein fragments, combinations of different amino acids that act as signaling molecules in the body. In online forums and chat groups, however, peptides are discussed in the same way that one might talk about power-ups in a video game.

“Darken eyebrows and facial hair?” one person asks on a popular peptide forum.

In another, one asks, “Best price on [human growth hormone] right now?”

Peptides do occur naturally; the human body produces several on its own, but many of those in-demand are synthetic.

Cosmetic and dietary products with peptides can be found in abundance, all claiming to offer health and beauty benefits through the allure of clinical data. Perhaps the most well-known today are the blockbuster GLP-1 injectable drugs semaglutide and tirzepatide, sold commercially as Ozempic and Mounjaro.

Peptide therapy enthusiasts expound on the benefits of vials containing compounds like glutathione and GHK-Cu, naturally occurring peptides lauded for their anti-aging, antioxidant benefits, or BPC-157, studied for its regenerative, healing properties.

Proponents often combine several different peptides in what they call a “stack.”

“Most of these are not approved drugs. They are substances, chemicals, bioactive chemicals that have been studied, but not in human clinical trials, generally speaking,” Edgar J. Asebey, partner in the law firm Frier Levitt’s Life Science Group, told The Hill. “And so, from the FDA regulatory world, that’s called an unapproved drug.”

Jay Campbell calls himself an “OG” in the peptide space. He sells guides on how to use peptides and has a stake in a company that sells them, Biolongevity Labs. As Campbell puts it, peptides are different than drugs.

“I don’t know any drugs that will accomplish what peptides will accomplish. And again, remember, I’m talking to this as a person who’s been using peptides for 25 years. So, peptides are that powerful, but they’re not magic bullets or easy buttons or exercise in a bottle or holy grails,” Campbell told The Hill.

‘A real safety concern’

The most legally sound avenue to access injectable peptides for personal use is through a physician who can provide a prescription that a compounding pharmacy can fulfill.

“Literally all the injectable peptides are only prescribable by and authorized by physicians,” said David Lau, an obesity specialist and professor emeritus of medicine at the University of Calgary’s Cumming School of Medicine.

Lau said Kennedy’s efforts to make more peptides available were “a real safety concern.” 

“Because any injectable peptide comes with safety concerns. As you can imagine, most of the time, the dosage has to be adjusted accordingly,” Lau added. “And patients who are taking injectable peptides should really be counseled properly how to inject themselves and how to avoid the side effects and how to increase the dosage slowly.”

The Food and Drug Administration (FDA) has authority over compounded peptides, splitting them across three different categories. Those in Category 1 can be compounded for patients, while those in Categories 2 and 3 are generally deemed unsafe or lacking sufficient data.

Soon after Kennedy appeared on “The Joe Rogan Experience” podcast in February, promising action to expand access to peptides, the FDA moved to take about a dozen off Category 2 and put them in Category 1.

By moving more peptides to Category 1, people who have been taking these substances could more easily access them through legitimate pathways.

The growing enthusiasm surrounding peptides hasn’t escaped Congress’s notice. Rep. David Kustoff (R-Tenn.) asked Kennedy about his plans for “mainstreaming” peptides in a hearing earlier this month.

“Peptides are like supplements,” Kennedy told Kustoff, noting that FDA does not require safety studies if drugs aren’t mass marketed with specific claims and indications.  

“Peptides were not supposed to be regulated. It’s been upheld again and again by the courts. The Biden administration improperly moved them to Category 3 without any evidence of safety,” he added.

Online free-for-all

The online marketplace has not been waiting for Kennedy’s liberalization. Countless vendors sell “research grade” peptides online. 

While they specify that what they sell is not for human consumption, the websites strongly resemble online storefronts and product descriptions list the various benefits the peptide might have.

A quick glance through online forums makes it clear that buyers disregard warnings against human consumption. There is no screening process to buy these substances, and the necessary equipment to mix and inject oneself at home is equally easy to purchase online.

Campbell, whose company sells peptides for “research and development use only,” said that when people buy off these websites, “You’re basically stating that you understand that you’re researching on yourself, or again, whomever. And that you are educated as to the process.”

People can quickly find peptide vendors based in China or India through online forums that offer to sell directly to consumers at steeply discounted prices. Buyers contact these vendors through platforms like WhatsApp, communicating with accounts with profile photos of seemingly AI-generated images of young, attractive women promising good deals.

In a peptide-purchasing chat group, one member quips, “Most factories have a single dude at the factory, usually family of the owners, who will pretend to be an entire team to make it seem more legit.”

“Wait until this dude finds out the ladies he thinks he’s buying from is all the same Chinese uncle.”

Placing the purchase 

A vial of peptides is arranged for a photograph in Washington, D.C., on Friday, April 24, 2026.

It took about 30 minutes of back-and-forth before an overseas vendor promised to send purchases through U.S. Customs, as soon as they received payment — either through cryptocurrency or wire transfer. PayPal is not accepted.

This reporter prefers more traditional online purchases, so turned to U.S.-based company, which bills itself as a research-only vendor, ordering a bottle of muscle-boosting peptide for $29.75, including shipping. 

It took less than a week for a small vial of white powder labeled “NOT FOR HUMAN OR ANIMAL CONSUMPTION” to arrive at our office. 

Other websites sell the necessary mixing mediums to reconstitute the peptide at home, which The Hill did not purchase. 

According to those familiar with the gray market peptide space, the substances being sold on these websites are sourced from the same places that gray market vendors are getting theirs.

“These are primarily online businesses that have popped up that sell primarily peptides and GLP-1s, and they source their [active pharmaceutical ingredient] typically from China, and not necessarily from FDA registered labs. And make them available essentially by clicking, ‘Yes, I will not use this for human use,’” said Asebey.

For patients using DIY peptides, there is no physician to manage dosages or check for reactions. And there is no accountability if something goes wrong.

Campbell acknowledged that when dealing with research-only peptides, the recourse for any injury lands on the end user, noting that when it comes to “pharmaceutical preparation, you have the doctor for the liability chain, you obviously have the pharmacy.”

One striking example of the risk that peptide enthusiasts incur is the increasingly popular retatrutide, or “reta” as it’s referred to among many online circles. 

Retatrutide is a GLP-1 candidate being developed by Eli Lily that has shown promising results in Phase 3 trials but it has not yet been approved for use in any country.

In an online chat group, one member expressed concern after experiencing a stomach flu after starting to take a GLP-1 peptide. In text exchanges shown to The Hill, another user advises them to “never admit grey to a medical provider.”

“If your insurance finds out. Who knows what they will say down the road.”

The amino acid sequence for retatrutide is published in Lilly’s patent for the product. A chemist overseas could look at the patent and formulate what they believe to be a similar or identical molecule. 

But the pharmaceutical candidate being developed by Lilly is more than just the molecule, and insiders say there’s no guarantee that what people buy on the gray market will be safe and effective.

This lack of approval hasn’t stopped numerous vendors from selling substances they claim to be molecularly identical to retatrutide to consumers all too eager to get their hands on the latest, greatest weight loss product.

The draw for some people is that peptides appear to be more natural than drugs, being fragmented proteins — in line with other priorities of Kennedy’s “Make America Healthy Again” movement, which is skeptical of many vaccines and pharmaceuticals. 

But this is often not the reality, said Lau. 

“Many of them are synthetic in nature. It all depends on what kind of medications we’re dealing with,” he said. “The peptides that we’re dealing with in terms of the injectables are not naturally occurring molecules.”

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