Staresinic M, Sebecic B, Patrlj L, et al. (2003). Gastric pentadecapeptide BPC 157 accelerates healing of transected rat Achilles tendon and in vitro stimulates tendocytes growth. J Orthop Res, 21(6):976-83.
AnimalPMID 14554208DOI↩
What is BPC-157?
BPC-157 is a small peptide: a short chain of 15 amino acids, the building blocks of proteins [1]. The name stands for Body Protection Compound. It’s based on part of a protein that scientists at the University of Zagreb in Croatia discovered in human stomach juice in the early 1990s [2]. The BPC-157 used in research is made in a lab.
What makes BPC-157 stand out is how tough it is. Most peptides break down quickly in the stomach, but BPC-157 stays intact in human stomach juice for more than 24 hours [3]. That durability is one reason researchers have been able to test it by injection, by mouth, and even as a skin cream [4].
BPC-157 has been the subject of more than 200 published papers [S1], and interest is growing fast, especially in sports medicine [5]. It is still experimental, though. No medicine containing BPC-157 has been approved anywhere in the world [S2], and research in people has only just begun [6].
How might it work?
Scientists haven’t pinned down exactly how BPC-157 works, and no single target in the body has been confirmed [S2]. Lab studies point to several ways it may support healing:
- Building new blood vessels. Healing tissue needs a good blood supply. In lab and animal studies, BPC-157 boosted the growth of new blood vessels, partly by increasing a receptor (VEGFR2) that signals cells to build them [7]. A 2026 study identified a protein inside cells that BPC-157 may attach to in order to do this [8].
- Helping blood vessels relax. BPC-157 appears to work through nitric oxide, a natural molecule that widens blood vessels. It relaxed blood vessels taken from rats [9]. A 2026 study saw the same effect for the first time in human arteries, using tissue left over from heart bypass surgery [10].
- Getting repair cells moving. In tendon cells, BPC-157 didn’t make cells multiply faster. Instead, it helped them survive stress and move toward where they were needed [11].
- Boosting growth hormone signals. BPC-157 increased the number of growth hormone receptors on tendon cells, which may make them more responsive to the body’s own repair signals [12].
What has research found?
Here’s a quick tour of the main findings. Unless noted, these studies were done in rats, and most come from the Zagreb team that discovered BPC-157. Studies from other labs are flagged, because independent confirmation is an important step in science.
Tendons and ligaments
This is where BPC-157 has drawn the most attention. Rats with a cut Achilles tendon healed stronger and walked better when given BPC-157 [1]. It also helped tendons reattach to bone, even in rats given steroid medicines that normally slow healing [13]. A torn knee ligament healed better whether BPC-157 was injected, added to drinking water, or applied as a cream [4]. An independent lab in Turkey saw a trend toward better tendon healing in 2026, but the difference wasn’t large enough to rule out chance. That’s a reminder of why more testing matters [14].
Muscle
After serious muscle injuries, such as a fully cut thigh muscle or a crushed calf muscle, rats given BPC-157 regained strength and movement faster [15, 16].
Bone
Rabbits were given a gap in a forearm bone that wouldn’t heal on its own. In these rabbits, BPC-157 helped bridge the gap about as well as a bone graft [17].
Gut
BPC-157 started life as a potential ulcer treatment. An independent team in China found that it reduced stomach ulcers in rats [18]. Zagreb researchers have reported that it protects the gut from damage caused by common painkillers (NSAIDs) and helps heal colitis, a type of bowel inflammation [19, 20].
Brain and nerves
In animal studies, BPC-157 reduced damage after head injuries in mice [21] and improved movement after spinal cord injuries in rats [22].
Skin
Applied as a cream, BPC-157 helped burn wounds in rats close faster, with more new tissue and collagen [23].
Blood flow
An independent study from Turkey found that BPC-157 reduced damage to leg muscle after blood flow was cut off and then restored, a type of injury that can happen during surgery or after a blocked artery is reopened [24].
What about studies in people?
Human research is just beginning. So far there are three small reports, involving about 30 people in total [25, 26, 27]:
- Knee pain (2021): 14 of 16 people who had BPC-157 injected into the knee said their pain improved [25].
- Bladder pain (2024): All 12 women with interstitial cystitis, a painful long-term bladder condition, reported improvement after BPC-157 was injected into the bladder [26].
- Safety check (2025): Two adults who received BPC-157 through an IV had no side effects and no changes in their blood tests [27].
These results are encouraging, but they’re early. None of these studies compared BPC-157 with a placebo (a dummy treatment), so there’s no way to tell how much of the improvement came from BPC-157 itself [28, 29]. Researchers say well-designed clinical trials are the next big step [30].
How strong is the evidence?
| What we know so far | What we still don’t know |
|---|---|
| BPC-157 has helped healing in many different animal injury models [31] | Whether it works the same way in people |
| Independent labs in Taiwan, China, and Turkey have reported encouraging results of their own [7, 18, 24] | The right dose, how often, and for how long [28] |
| Animal safety studies have looked reassuring [32] | How the human body absorbs and clears it [6] |
| A 2025 review of muscle and joint research found 35 animal studies and one human study [5] | Whether it’s safe over the long term [S2] |
A few more things to keep in mind:
- One team has done most of the work. About three out of four published BPC-157 papers include authors from the Zagreb group [S1]. Independent research is growing, but it’s still limited.
- Almost every study is positive [31]. That’s exciting, but it can also mean that studies with disappointing results never got published.
- It leaves the blood fast. In animals, BPC-157 is cleared from the blood in under 30 minutes [33], yet its effects seem to last much longer. Researchers are still working out why [6].
Safety: what we know
- Animal safety studies look reassuring. A research team in China tested BPC-157 in mice, rats, rabbits, and dogs. It was well tolerated, with only mild irritation where it was injected and no signs of harm to genes or developing offspring [32].
- Human safety data are very limited. The small human reports didn’t record side effects, but they were too small to show that BPC-157 is safe [30]. FDA has received reports of injection-site reactions, shortness of breath, and skin darkening in people using BPC-157, though it couldn’t confirm that BPC-157 was the cause [S2].
- Product quality is a real concern. BPC-157 isn’t an approved drug, so products sold online aren’t held to pharmaceutical standards. They may contain impurities or a different amount than the label says [34]. FDA has also noted that impurities in injected peptides could trigger immune reactions [S2].
- Some questions are still open. Because BPC-157 helps grow blood vessels, some experts have raised a theoretical question about whether it could affect tumor growth [34]. No study has tested this directly yet.
Legal status
- Not an approved medicine anywhere in the world [S2].
- United States: FDA is deciding whether pharmacies may prepare (compound) BPC-157. FDA’s own reviewers raised quality and safety concerns, but an FDA advisory panel voted in favor in July 2026. A final decision is still pending [S2, S3].
- UK and EU: Not authorized as a medicine, and UK law doesn’t allow unauthorized medicines to be sold [S4].
- Sports and military: Banned by the World Anti-Doping Agency (WADA) [S5] and on the US military’s list of prohibited supplement ingredients [S6].
The bottom line
BPC-157 is a fascinating peptide. In more than 30 years of research, it has shown encouraging results across an unusually wide range of injuries in animals, from tendons and muscles to the gut and nerves. Independent labs are now starting to uncover how it might work.
What’s missing is the evidence that matters most: carefully designed clinical trials in people. Until those trials happen, BPC-157 remains a promising research compound, not a proven treatment. Researchers are calling for exactly those studies [30], which makes this an exciting peptide to watch.