Healing Peptides — BPC-157 & TB-500
The repair category
BPC-157 ("Body Protection Compound 157", a stomach-derived 15-amino-acid fragment) and TB-500 (synthetic thymosin-β4) are the two peptides most frequently discussed for tissue repair — tendon, ligament, gut lining, muscle. The hype outruns the data.
Mostly rodent evidence
BPC-157 has strong tendon, gut, and neuroprotective data — in rats. Human trials are nearly absent. Thymosin-β4 has a slightly deeper human evidence base (cardiac injury, dry eye) but still modest. Anyone claiming certainty about dose or effect in humans is extrapolating.
Match the claim to the evidence
How strong is the human evidence behind each common claim?
This step is interactive — open the Thier app to try it.
Regulation reality
Neither BPC-157 nor TB-500 is FDA-approved for any indication. The FDA has actively restricted compounding of BPC-157. What people buy online is research-grade material, frequently unverified for purity, and self-administered. The legal grey zone is part of the risk.
What good rehab evidence already shows
Before reaching for unproven peptides, the evidence-backed tools for tendon + ligament healing are: heavy-slow-resistance loading (HSR — Cook + Purdam protocols, 30–40 % faster recovery vs eccentrics alone), blood-flow-restriction training during the rebuild phase, collagen + vitamin C 60 minutes pre-workout (15 g hydrolysed collagen doubles tendon collagen synthesis per Shaw 2017, PMID 27852613), and patience. Most BPC-157 use happens in athletes who haven't fully optimised these. Get the basics dialled in before paying for research-chemical injections.
Key Takeaway
BPC-157 and TB-500 have promising rodent data and enthusiastic anecdotal use in athletes. Human evidence is minimal. The products people buy are research chemicals, not medicines. Get the evidence-backed rehab basics (heavy-slow-resistance, BFR, collagen + vitamin C) dialled in first. Informed optimism is the most defensible stance.