Peptides have become a major talking point online, and celebrities such as Kris Jenner have admitted to using them. Now, Health Secretary Robert F. Kennedy Jr. has spoken in favour of expanding public access to peptides.
So, what exactly are peptides? Web MD says they ‘are strings of molecules called amino acids, which are the building blocks of proteins,’ and explains that the body makes them naturally. They can function like signalling molecules, helping direct cells and processes.
One reason they’ve taken off in popularity is that some people choose to inject peptides, aiming to send those signals straight into the bloodstream. Supporters argue this avoids digestion in the gut, where substances can be broken down before they have an effect.
Health Secretary Robert F. Kennedy Jr has backed the use of peptides, telling Joe Rogan he’s a ‘big fan’. It has also been reported that the FDA will meet in July to discuss the possibility of easing rules around certain peptides.
Still, there are warnings about safety and oversight. The American Medical Association notes that “some injectable peptides are not regulated and may carry real health risks.”
Research into peptides varies widely depending on the specific compound. Some well-known medications fall into this category, including GLP-1 drugs such as Ozempic and Wegovy, which are classed as peptides.
But other compounds that have become popular online—such as BPC-157 and TB-500—haven’t completed the standard clinical pathways used to establish medicines, including robust human trials. That gap is a key reason medical experts urge caution.
Many of these products also aren’t FDA-approved treatments for people. So what does the available research actually suggest?
In a detailed look at the topic, the Daily Mail’s health editor reports that BPC-157 was identified in the early 1990s, with initial interest centred on potential gastrointestinal benefits. Animal research suggested it might help with tissue repair and reducing inflammation, but the publication says the evidence for meaningful benefits in humans remains limited.
Another major issue is scale and quality: some studies involve only small numbers of participants, making it difficult to draw firm conclusions about effectiveness or side effects. Questions around appropriate dosing and consistency of products also remain.
TB-500 is described as a synthetic peptide based on part of Thymosin Beta-4, and it’s commonly marketed with claims around tissue repair, cellular regeneration, and lowering inflammation.
According to the publication, researchers are only beginning to examine how it affects people, and current work is said to focus more on safety than on proving whether it helps recovery from injuries.
“TB-500 is a smaller piece of thymosin beta 4. This means that research on thymosin beta 4 does not necessarily show that TB-500, the version most commonly sold online, helps a person recover faster from a tendon, muscle or joint injury,” the publication states.
The AMA also cautions: “While peptide therapy may possess significant therapeutic and regenerative potential, it is critical that orthopaedic and sports medicine providers understand the current lack of evidence to support the clinical use of these peptides.”
Anyone considering peptides or worried about possible side effects should speak with a healthcare professional for personalised advice.