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Research in plain language

BPC-157

What it is

BPC-157 is a synthetic stable gastric pentadecapeptide (15 amino acids), a fragment derived from a protein found in human gastric juice. In animal studies it has been tested for its effect on healing of tendon, ligament, muscle-tendon junction, nerve, and the stomach lining. All efficacy evidence to date is preclinical (rats); there is no published human efficacy trial and no established human dosing protocol.

How studies used it

Model
Rat (male Wistar)
Studied for
Achilles tendon-to-bone healing after surgical detachment of the tendon from the calcaneal bone
Dose
10 ug/kg, 10 ng/kg, or 10 pg/kg per dose (rat study, already published per kg body weight)
Dosing
Once daily, first dose within 30 minutes after surgery
Route
Intraperitoneal injection
Duration
Assessed at days 1, 4, 7, 10, 14 and 21 after surgery (daily dosing until 24 hours before assessment)

Effects measured: Treated rats showed better tendon-to-bone healing functionally (higher Achilles functional index), biomechanically (higher load to failure, stiffness and Young's modulus), and histologically (better collagen organization, more vascularization, more type I collagen). BPC-157 also counteracted the worsening of healing caused by the corticosteroid methylprednisolone.

Side effects: No adverse events reported in this study

Sources: Krivic A, Anic T, Seiwerth S, Huljev D, Sikiric P. Achilles detachment in rat and stable gastric pentadecapeptide BPC 157: promoted tendon-to-bone healing and opposed corticosteroid aggravation. J Orthop Res. 2006;24(5):982-9.

Model
Rat (Wistar)
Studied for
Medial collateral ligament (MCL) healing after surgical transection of the ligament
Dose
Intraperitoneal 10 ng/kg per dose; or topical 1.0 ug per gram of cream; or per-oral 0.16 ug/mL in drinking water (about 12 mL/rat/day). The injected figure is already per kg body weight in this rat study.
Dosing
Intraperitoneal once daily; topical first applied 30 minutes after surgery and last 24 hours before sacrifice; oral continuous in drinking water
Route
Intraperitoneal, topical (cream), and per-oral (drinking water) compared
Duration
Up to 90 days after surgery

Effects measured: All three delivery routes produced consistent improvements in ligament healing across functional, biomechanical, macroscopic and histological measures versus controls. The abstract reports the direction of effect (improved healing) but does not give per-measure numeric values.

Side effects: No adverse events reported in this study

Sources: Cerovecki T, Bojanic I, Brcic L, Radic B, Vukoja I, Seiwerth S, Sikiric P. Pentadecapeptide BPC 157 (PL 14736) improves ligament healing in the rat. J Orthop Res. 2010;28(9):1155-61.

Model
Rat
Studied for
Disabled myotendinous junction (quadriceps tendon dissected from the muscle, a defect that does not heal on its own in rats)
Dose
Intraperitoneal 10 ug/kg or 10 ng/kg per dose; or per-oral 0.16 ug/mL or 0.16 ng/mL in drinking water (about 12 mL/rat/day). The injected figures are already per kg body weight.
Dosing
Intraperitoneal from immediately after surgery until 24 hours before sacrifice; oral continuous in drinking water until sacrifice
Route
Intraperitoneal and per-oral (drinking water)
Duration
Sacrifice at 7, 14, 28 and 42 days after surgery

Effects measured: Treated rats showed improved macroscopic and microscopic findings, greater biomechanical strength, and better functional recovery. The junction defect reportedly disappeared completely by day 42, muscle atrophy was counteracted, inflammatory infiltrate was reduced, and markers eNOS and COX-2 were normalized with reduced oxidative stress versus untreated controls.

Side effects: No adverse events reported in this study

Sources: Japjec M, Horvat Pavlov K, Petrovic A, et al. Stable gastric pentadecapeptide BPC 157 as a therapy for the disable myotendinous junctions in rats. Biomedicines. 2021;9(11):1547.

Model
Rat
Studied for
Gastric ulcer (acute model, acetate-induced chronic ulcer model, and pylorus-ligation model)
Dose
200, 400 or 800 ng/kg per dose (rat study, already published per kg body weight)
Dosing
Single or continuous administration depending on model
Route
Intramuscular or intragastric (compared)
Duration
Not specified in the abstract; spans acute and chronic ulcer protocols

Effects measured: BPC-157 reduced ulcer area, with ulcer-formation inhibition ratios of 45.7% to 65.6%. The 800 ng/kg intramuscular dose gave inhibition of 65.5%, 65.6% and 59.9% across the three models. It accelerated rebuilding of glandular epithelium and granulation tissue. Intramuscular dosing was more effective than intragastric and worked at a lower effective dose; effect compared favorably with famotidine controls.

Side effects: No adverse events reported in this study

Sources: Xue XC, Wu YJ, Gao MT, et al. Protective effects of pentadecapeptide BPC 157 on gastric ulcer in rats. World J Gastroenterol. 2004;10(7):1032-6.

Model
Rat (Wistar)
Studied for
Traumatic sciatic nerve injury (complete transection of the sciatic nerve)
Dose
10 ng/kg (published per kg body weight); the abstract also lists a 10 ug arm whose per-kg versus per-animal basis is not specified
Dosing
Repeated administration after nerve transection (intraperitoneal/intragastric arms) with local application at the anastomosis in other arms
Route
Intraperitoneal, intragastric, local at the anastomosis site, and injected into nerve-tubing
Duration
Followed over the post-injury regeneration period (functional and histomorphometric assessment)

Effects measured: Treated rats showed faster axonal regeneration: improved motor action potentials, higher sciatic functional index scores, and no autotomy behavior versus controls. Histomorphometry showed larger myelinated fiber diameter, greater myelin thickness, and higher fiber density.

Side effects: No adverse events reported in this study

Sources: Gjurasin M, Miklic P, Zupancic B, et al. Peptide therapy with pentadecapeptide BPC 157 in traumatic nerve injury. Regul Pept. 2010;160(1-3):33-41.

Model
Mice (BALB/c and ICR), rats (Sprague-Dawley), rabbits, and dogs
Studied for
Preclinical safety and toxicology evaluation (single-dose, repeated-dose, genotoxicity, embryo-fetal, and local tolerance) for wound-healing use
Dose
Highest specifically reported dose was 2 mg/kg in dogs, where a reversible creatinine decrease occurred; exact per-kg maxima for most species were not given in the abstract
Dosing
Single-dose and repeated-dose protocols across species
Route
Oral administration and intramuscular injection
Duration
Repeated-dose toxicity with a 2-week withdrawal/recovery period assessed in dogs

Effects measured: BPC-157 was well tolerated and caused no serious toxicity in any of the four species. Single-dose studies showed no test-related effects. In dogs, a reversible decrease in creatinine occurred at 2 mg/kg (not at lower doses), reversing after a 2-week withdrawal. No genotoxicity and no embryo-fetal toxicity were observed. No LD50 was reported in the abstract.

Side effects: Local tolerance testing showed only mild irritation. The only notable systemic finding was a reversible decrease in serum creatinine in dogs at 2 mg/kg. No serious toxicity, no genotoxicity, and no embryo-fetal toxicity were observed.

Sources: Xu C, Sun L, Ren F, et al. Preclinical safety evaluation of body protective compound-157, a potential drug for treating various wounds. Regul Toxicol Pharmacol. 2020;114:104665.

How solid the evidence is

Honest assessment: All efficacy evidence for BPC-157 is preclinical and almost entirely in rats. There is no published human efficacy trial and no established human dosing protocol; anyone citing a "human dose" is extrapolating, not following validated guidance. A large share of the published work comes from a single research group around P. Sikiric (Zagreb), which is a recognized concentration-of-source limitation and means independent replication is thin. The rat studies report doses already normalized per kilogram (10 ug/kg, 10 ng/kg, 10 pg/kg, 200-800 ng/kg), which is useful, but effective doses span many orders of magnitude and the abstracts often state the direction of effect without full numeric tables. Routes are mixed (intraperitoneal, intramuscular, intragastric, oral via drinking water, topical), so results are not directly comparable across studies. On safety, the one multi-species preclinical toxicology study (Xu 2020, Regul Toxicol Pharmacol) found BPC-157 well tolerated with only mild local irritation, no genotoxicity, no embryo-fetal toxicity, and a single reversible finding (decreased creatinine in dogs at 2 mg/kg); however this is animal toxicology, not human safety data, and no LD50 was reported. Bottom line: promising and consistently positive in rodent healing models, but unproven in humans, dependent on a narrow group of investigators, and without any validated human dose or long-term human safety record.

Sources

Study data, research use only. No established human dosing protocol.