BPC-157 vs TB-500
How two of the most referenced research peptides compare on origin, structure, and the research contexts they appear in.
BPC-157 and TB-500 are often named together, because both appear in the same corner of the research literature: studies of tissue repair. They are, however, different molecules with different origins. This page compares them as research materials, by classification, structure, and where scientific attention has gone. It does not describe use in people or animals, and none of it is medical guidance.
Two different origins
Both compounds are stable, lab-synthesized fragments of naturally occurring proteins, but they trace back to unrelated sources.
- BPC-157 is a fifteen-amino-acid fragment (a pentadecapeptide) derived from a protein found in gastric juice. Its name, Body Protection Compound, points back to that parent sequence.
- TB-500 is a synthetic fragment related to thymosin beta-4, a naturally occurring actin-binding protein present in most mammalian cells. It reproduces a short active region of that protein.
Side by side
| Property | BPC-157 | TB-500 |
|---|---|---|
| Class | Synthetic peptide fragment | Synthetic peptide fragment |
| Structure | 15 amino acids (pentadecapeptide) | Short sequence related to thymosin beta-4 |
| Derived from | A protein found in gastric juice | Thymosin beta-4, an actin-binding protein |
| Research threads | Tissue repair, gastrointestinal models | Actin regulation, cytoskeletal dynamics, tissue repair |
| Form | Lyophilized powder | Lyophilized powder |
| Status | Research compound, not a drug | Research compound, not a drug |
Where each appears in the literature
The two compounds overlap in one research area and diverge in others.
- BPC-157 appears predominantly in tissue-repair and gastrointestinal research models, the latter reflecting its origin in a gastric protein.
- TB-500 appears in actin-regulation and cytoskeletal-dynamics research, alongside tissue-repair and cell-migration models.
Where they meet is tissue repair, which is why they are so often mentioned in the same breath. Where they differ is everything around it: BPC-157 carries a gastrointestinal research thread, while TB-500 is tied to actin and the cytoskeleton. As always in this library, saying a compound is "studied in" an area describes where research has gone, not a claim that it produces any result in humans or animals.
What they have in common
Beyond the research overlap, the two are handled the same way in the lab. Both ship as lyophilized powder, both are stored cold and dry until a researcher reconstitutes them under their own protocol, and both, at Vaelith, ship with a verifiable third-party certificate of analysis so a lab can confirm identity and purity before use. If you want to read more about that document, see our guide on how to read a certificate of analysis.
Frequently asked
What is the difference between BPC-157 and TB-500?
They are different peptides from different parent proteins. BPC-157 is a fifteen-amino-acid fragment derived from a gastric protein. TB-500 is a synthetic fragment related to thymosin beta-4, an actin-binding protein. They overlap in tissue-repair research but otherwise appear in different areas of the literature.
Are they the same thing?
No. They are distinct molecules with different structures and origins, often discussed together because both appear in tissue-repair research models.
Are they approved for use?
No. Both are research chemicals and are not approved for human or veterinary use.
How do I confirm a lot is genuine?
Every lot has a certificate and a verifiable number. Enter it on the verification page.