What are peptides, are they safe and is there evidence to back up the hype? | Weight-loss drugs

What are peptides?

Peptides are short chains of amino acids.

Some peptides occur naturally in the body and have specific functions. For example, the hormones insulin, oxytocin, and vasopressin are peptides that play a role in regulating blood sugar levels, social behavior, water retention, and blood pressure, respectively.

Other naturally occurring peptides are formed when proteins are broken down in the body, for example when food is digested.

But in recent years there has been an explosion of interest in using peptides for therapeutic purposes, from weight loss to anti-aging to recovery from injuries.

These include approved prescription weight loss medications based on synthetic peptides that mimic natural hormones, such as semaglutide (available in Wegovy) and tirzepatide (available in Mounjaro).

However, many peptides on the market have not gone through stringent regulatory processes like those used in pharmaceuticals. Instead, unregulated, experimental peptides are sold for self-injection.

Who injects peptide products?

Dr D., senior lecturer in criminology at the University of Lincoln. According to Luke Turnock, peptides were initially of particular interest and by the 2010s were largely seen among powerlifters and bodybuilders.

“And at that time it was mostly growth hormone-releasing peptides, GHRP-2, GHRP-6, but there was some buzz about these emerging peptides like TB-500,” he said, noting that they were not only taken for the purported effects on muscle growth and tissue repair, but also to prevent the collapse many experience when they stop taking steroids.

But since then there has been an explosion of interest.

US podcaster Joe Rogan has claimed, among others, that BPC-157 and TB-500 peptides help heal injuries, a combination known as the “Wolverine stack” after the Marvel superhero. Other popular peptides include CJC-1295, MK-677 and ipamorelin, which are claimed to help build muscle, and GHK-Cu, which is claimed to have anti-aging effects.

As a result, social media is flooded with people talking about peptides, including how to sell them, where to buy them, and how to inject them.

“I still think there are people who are mostly interested in health, fitness and well-being,” Turnock said. explored the use of such peptides in the UK.

Is there evidence to support the claims made for these experimental peptides?

Academics have noted that most experimental peptides have little scientific evidence to support the claims, and where there are studies they are usually in animals or cells.

For example, According to a recent review BPC-157, by researchers in the US studying peptides commonly marketed to patients with musculoskeletal injuries, “showed potential benefits in tendon and muscle repair, but these findings were largely unconfirmed in human trials,” there were no randomized control trials in humans of such uses, and it was the only case series with serious defects.

They added that a peptide called TB-4 and a similar synthetic peptide, TB-500, showed some signs of promoting blood vessel formation and tissue repair in cell studies and animal studies, but experts noted that human data on musculoskeletal conditions is lacking. They said no studies have been done on TB-500 in humans. Moreover, they are both banned banned substances in sportsIt is on the World Anti-Doping Authority’s banned list.

And there’s another problem with such peptides: “More importantly, information regarding the indications, dosage, frequency, and duration of treatment is unknown,” the researchers wrote.

What is the legal situation?

Many popular peptides are not accepted as medicines in the UK; This means they are not regulated by the UK Medicines and Healthcare products Regulatory Agency (MHRA).

But the situation changes if sellers (websites, clinics or social media vendors) claim that peptides have medicinal effects.

Lynda Scammell, head of borderline products at the MHRA, said: “A product containing a peptide must have a marketing authorization before it can be legally sold or supplied in the UK when claims are made about the medicine or the products are used in a way that falls within the definition of a ‘medicinal product’ under the Human Medicines Regulations 2012.

“If a product is classified as a medicine and is not properly registered, we may take action to ensure compliance, including removing the product from the UK market where necessary. The specific action taken is determined by taking into account all available evidence and relevant legal precedent.”

The MHRA also stressed that labeling peptides “for research purposes only” – a trick used by many social media vendors and websites – was not enough to avoid scrutiny.

“We do not consider claims that products are for ‘investigational use’ when it is clear that such claims are being used to evade drug regulations,” Scammell said. “If there is evidence in the promotional material that the products are in fact unauthorized drugs for human use, we will take the necessary regulatory action.”

What’s the problem?

Experts have raised a number of concerns about the risks of using experimental, unregulated peptides.

Prof Adam Taylor, from the University of Lancaster, said potential benefits in pre-clinical studies, such as those on animals and cells, did not necessarily mean a peptide was beneficial to humans.

“We know that every drug that is approved in terms of safety profile, toxicology, and pharmacokinetics gets approved later… in humans, whatever it is that we want to treat, there are just as many, if not more, that fall by the wayside along the way because they don’t have a specific benefit,” he said.

Aside from concerns about the purity of the products, Taylor also noted that peptides produced for research purposes may contain other ingredients or bacterial endotoxins that are dangerous to humans. The latter can trigger septic shock.

Naturally occurring peptides are maintained at very specific levels by the body, meaning increasing their levels through injections could disrupt the balance of body systems, he said. Moreover, since many peptides are involved in many different pathways in the body, taking them may lead to unexpected results.

Another concern is that some peptides are produced in larger amounts in some tumors, which means injecting similar substances can be problematic.

“There’s absolutely no evidence right now that that’s happening. But when we think about risk and benefit, the risk is if you have low-grade inflammation, if you have early signs of cancer, are you going to overload that pathway and cause the cancer to grow bigger, faster?” Taylor said.

Aside from the risks of self-injection (such as accidentally injecting air), there were also concerns that the peptides could interfere with medications people were already taking.

While it is unclear how long people take the peptides, there is little, if any, active monitoring of their effects.

“If something goes wrong in the short term [users will] I don’t see. “And if something starts to creep in, they won’t be able to see it and potentially the damage will have already been done,” Taylor said.