Essential Traceability: Thousands of Unregulated Substances Tested as Peptide Craze Grows

In the UK, thousands of unregulated products, advertised as aiding in weight loss and enhancing wellness, are being submitted to labs for testing, due to a surge in the market for injectable peptides.

The peptide testing sector has seen rapid growth as the popularity of these substances increases. A laboratory shared with the Guardian that ten years prior, it conducted just a few tests monthly, received from global customers and vendors curious about their contents. Now, it processes approximately 60,000 samples annually, including about 2,000 samples from the UK alone since 2024.

Peptides are short chains of amino acids, and they are components of many natural bodily substances such as hormones, including insulin and oxytocin, as well as synthetic substances created in labs.

These synthetic peptides are used in prescription medications like Wegovy, which simulate the natural hormone GLP-1, and are also found in experimental treatments promoted by the rapidly growing biohacking and anti-aging sectors. On platforms like Telegram and TikTok, users tout these injections as solutions for healing injuries, enhancing mental focus, and reducing wrinkles.

However, many of these peptides are not approved by regulatory bodies, and experts caution that they often lack solid safety data and quality assurance. They are frequently marketed as “for research purposes only,” despite being used personally by consumers.

According to the Texas-based Finnrick laboratory, about a third of the numerous products they analyze do not pass basic quality tests, a statistic that has remained fairly constant over the last year or so.

The common issues identified include incorrect product identity, purity levels below the 98% standard, and incorrect quantities in the vials, leading to customers often not receiving what they paid for.

Finnrick generally purchases peptide products itself for testing, preferring to analyze samples acquired through regular consumer channels rather than directly from vendors. Since last June, they also began accepting samples from the public, marking those received directly from vendors clearly on their website.

Occasionally, the peptides tested are unauthorized versions of approved drugs, like semaglutide or tirzepatide, obtained at a much lower cost online.

Sold under the guise of “research purposes only,” these compounds sometimes escape strict regulation due to their ambiguous classification, allowing sellers to take advantage of legal loopholes.

Dr. Luke Turnock, a senior lecturer in criminology at the University of Lincoln, highlighted the risks: “You may not actually receive what you think you’re buying, and there’s also the danger of incorrect dosages.”

“And if you do get what you think you’re buying, we still lack the long-term clinical data to understand potential harms, such as increased cancer risk or organ damage, which might not be immediately apparent,” he added.

Peter Magic, a chemist at Janoshik Analytical in the Czech Republic, noted that the number of samples they receive for testing has soared to 5,000 per month. “There was a sharp increase in demand about three or four years ago, primarily for peptides,” Magic explained, linking the surge to the introduction of effective GLP-1 drugs like semaglutide and tirzepatide, and more recently, retatrutide, which is still undergoing clinical trials and is not yet approved in the UK.

Magic mentioned that the UK is a significant player in this growing market, comparable to Canada and behind only the US and China, with around 2,000 testing orders since 2024. “The UK has a large population and the peptide market here is closely linked with that of performance-enhancing drugs, often sharing the same factories, vendors, and distribution networks,” he observed.

The substantial profit margins attract both legitimate businesses and illicit actors to the industry. “A vial purchased for about $15 from China can be resold for ten times that amount. This easy profit potential draws many, including those with malicious intent, to the market. It’s seen as less serious than dealing in narcotics or anabolic steroids,” Magic explained.

An analysis of over 5,000 peptide-related TikTok videos revealed that 64% were from US-based creators. The UK was the second largest contributor, producing 16% of these videos.

Prof Amira Guirguis, chief scientist at the Royal Pharmaceutical Society, stated, “Online retail-style peptide sales, often under labels like ‘research use only,’ operate outside standard regulated systems. Given these substances can alter physiological functions when introduced into the body, issues concerning oversight, traceability, and quality assurance are crucial.”