TB-500 vs BPC-157 compared on origin, structure, mechanism and analytical testing, with PubChem data and a linked BPC-157 batch certificate.
Written by the Peptide Labs Research Team

The TB-500 vs BPC-157 comparison comes down to origin and molecular target. BPC-157 is a synthetic peptide modelled on a gastric juice protein sequence, and its mechanism is still poorly defined in the literature, while TB-500 is a synthetic form related to thymosin beta-4, a natural protein that binds monomeric actin.
The two peptides differ in origin and in how well each mechanism is defined.
| Property | BPC-157 | TB-500 |
|---|---|---|
| Origin | Synthetic, gastric protein sequence | Synthetic, related to thymosin beta-4 |
| Reported target | Not firmly established | Monomeric actin binding |
| Formula (PubChem) | C62H98N16O22 | Depends on form supplied |
| Molecular weight (PubChem) | 1419.5 g/mol | Depends on form supplied |
Thymosin beta-4 regulates actin polymerisation. BPC-157 has no agreed single target. Further reading: the TB-500 and actin regulation article and the BPC-157 research overview.
Purity is checked by HPLC and identity by mass spectrometry. BPC-157 10mg batch 100237 tested at 99.826% purity by Janoshik Analytical (certificate).
The name TB-500 is applied to more than one form, so a mass spectrometry result matters as much as the purity figure. The HPLC purity guide explains what that number measures.
Any TB-500 vs BPC-157 comparison on specification starts with the certificate of analysis. Lyophilised laboratory material is stored cold and dry. Light is avoided.
Peptide Labs supplies these compounds for in-vitro laboratory research only. They are not for human or animal use, and nothing here is therapeutic or medical advice.
Thymosin alpha 1 explained: its 28-residue structure, PubChem formula and weight, and what to check on a COA before research use only.
Industry & RegulationThe TGA warned Australians to discard Synedica peptide products after testing found no detectable TB-500 and less retatrutide than labelled.
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