BPC-157 vs TB-500
A peptide sold to heal tendons, muscles and the gut. It has been tested mostly in rats, and the only human report covers 12 patients. It is sold as an injection for healing torn muscles and tendons. No study has tested it for injuries in people or animals.
Both sit at grade C: animal and cell studies. Neither is FDA approved.
Evidence
CAnimal and cell studies
CAnimal and cell studies
Human studies cited
Animal or cell studies cited
Why the grade
A 2025 systematic review found 36 studies of BPC-157 for musculoskeletal injury: 35 preclinical, almost all in rats from one Zagreb research group, and one retrospective human series of 12 patients with knee pain. No randomized or controlled human trial has been published, so the healing claims rest on animal data (grade C).
There are no published human trials of TB-500 itself. The only TB-500-specific papers are doping-control chemistry studies that identified the peptide in gray-market and veterinary products and detected it in horses. Human trials exist for full-length thymosin beta-4 (a venous-ulcer safety study planned for 72 patients and an 18-patient eye-drop trial), but those tested a different, larger molecule.
FDA
Not approved
BPC-157 is not approved by the FDA for any use and is sold as a research chemical. The FDA put it in Category 2 of substances nominated for compounding in 2023 over safety concerns; the nominators later withdrew it, and the agency's Category 2 page now lists it as nominated but withdrawn. In July 2026 the Pharmacy Compounding Advisory Committee voted 8 to 6 to recommend adding it to the 503A bulks list, but the FDA has not proposed a rule to do so, so it still cannot be lawfully compounded.
Not approved
TB-500 is not approved by the FDA for any use and is sold as a research chemical. In July 2026 an FDA advisory committee voted to recommend it for the list of substances pharmacies may compound, but that recommendation has not become a rule and is not an approval.
Sold for
BPC-157 is sold as a healing peptide for tendons, ligaments, muscle and gut, taken by injection or orally, and is one of the most popular compounds in the grey-market peptide trade.
TB-500 is sold online as an injectable healing peptide for torn muscles, tendons and ligaments, often paired with BPC-157.
Studies say
Dozens of rat studies, nearly all from one laboratory, show faster tendon, ligament and gut healing, but the only human data are a 12-patient uncontrolled series, so nothing is established in people (grade C).
Nothing published tests TB-500 for injury in humans or animals; the evidence for its parent protein comes from small trials in wounds and the eye, so the grade is C.
Class
Synthetic pentadecapeptide (gastric-derived)
Synthetic Tβ4 fragment
Route
Several routes
Injection