The human studies
| Study | Design and people | What it reported | Why it is weak evidence |
|---|---|---|---|
| Lee & Padgett, 2021 | Retrospective chart review; 16 people who had received knee injections of BPC-157 (12) or BPC-157 with thymosin beta-4 (4) | 14 of 16 recalled relief of knee pain when phoned later | No control group, recalled pain, mixed diagnoses, no standard outcome measures |
| Lee, Walker & Ayadi, 2024 | Uncontrolled pilot; 12 women with interstitial cystitis given BPC-157 injections into the bladder wall during cystoscopy | All 12 reported large symptom improvement; no adverse events reported | No placebo, small, single clinic, self-rated outcome |
| Lee & Burgess, 2025 | Safety pilot; 2 adults given IV BPC-157 on two days | No changes in the blood tests measured; no side effects reported | Two people, two days: it cannot show a medicine is safe |
A 2025 systematic review focused on orthopedics screened 544 records and found 35 preclinical studies and one clinical study. It concluded that clinical safety data were lacking.
The animal research
Most BPC-157 research is in rats, where it has been reported to speed healing of tendons, ligaments, muscle, bone and the gut lining, and to promote new blood vessel growth. Much of this work comes from a single research group. Animal results often fail to carry over to people, which is why controlled human trials matter.
What is not established
- That BPC-157 heals tendon, ligament or muscle injuries in people.
- That it treats inflammatory bowel disease, ulcers or “leaky gut” in people.
- Its long-term safety, its effect on existing tumors (because it promotes blood vessel growth in animals), or its safety in pregnancy.
- That any one route (injection under the skin, into a joint, oral) works better than another.
Safety concerns
FDA’s safety review says BPC-157 may pose a risk of immune reactions and that it has limited safety information about potential harm to people. Reviews in sports medicine journals make the same point: favorable animal results, scarce human safety data. BPC-157 is also prohibited in competitive sport.
Questions to bring to a clinician
- What is causing my symptoms, and what proven treatments should I try first?
- Which of the findings I have read about come from people rather than rats?
- What would make you stop the treatment?