The short answer
Different origin, different sequence, different documentation
BPC-157 is a synthetic pentadecapeptide (15 amino acids) derived from a partial sequence identified in gastric juice. TB-500 is the name commonly used in the research-materials trade for a synthetic fragment associated with Thymosin Beta-4, a naturally occurring actin-binding protein. They come from unrelated source sequences and are evaluated with separate reference standards.
BPC-157 vs. TB-500 at a glance
| Characteristic | BPC-157 | TB-500 |
|---|---|---|
| Origin | Partial sequence identified in gastric juice | Fragment associated with Thymosin Beta-4 |
| Structure | 15-amino-acid synthetic pentadecapeptide | Synthetic fragment of a larger actin-regulating protein |
| Common labeled forms | Lyophilized vial, typically 5–10 mg | Lyophilized vial, typically 2–10 mg |
| Typical COA methods | HPLC purity, mass spectrometry identity confirmation | HPLC purity, mass spectrometry identity confirmation |
| Preclinical research focus | Gastrointestinal, tendon/ligament, and angiogenesis models | Actin regulation, cell migration, and tissue models |
The overlap in research areas — both appear in tissue-repair-related preclinical literature — is likely why the two are searched together and sometimes assumed to be interchangeable. Structurally, they are not related.
Reading a COA for each material
Because BPC-157 and TB-500 are distinct sequences, a Certificate of Analysis for one cannot be used to infer anything about a lot of the other. When reviewing either report, confirm the same core elements described in our COA guide: the sample identifier, the analytical method used, the lot or batch reference, and whether the report includes both a purity result and an identity-confirming method such as mass spectrometry.
See our HPLC vs. LC-MS guide for what each method can and cannot establish on its own.
Research-use controls
Both materials are supplied only for legitimate laboratory, analytical, academic, or institutional research. Neither is intended for human or veterinary use, consumption, diagnosis, treatment, or prevention. This guide is educational and does not provide medical, therapeutic, or human-use guidance.