On this pageWhat Research Peptides Are
BPC-157 and TB-500 are two of the most frequently requested research peptides, and they are often mentioned in the same breath. Chemically and biologically, however, they are quite different molecules. This guide explains what each compound is, what it is used to study at the molecular level, how the two compare, and what laboratories should look for in their analytical documentation. It is a research reference only and makes no claims about effects in people or animals.
What Research Peptides Are
Peptides are short chains of amino acids joined by amide (peptide) bonds, generally fewer than about 50 residues. Research peptides such as BPC-157 and TB-500 are made by solid-phase peptide synthesis, purified by preparative HPLC and supplied as lyophilized (freeze-dried) solids, usually as acetate or trifluoroacetate salts. In the laboratory they serve as tools for probing receptors, enzymes, cytoskeletal proteins and signaling pathways in defined experimental systems.
What Is BPC-157?
BPC-157 is a synthetic 15-amino-acid peptide with the sequence GEPPPGKPADDAGLV. It corresponds to a partial sequence of a protein, termed body protection compound, originally described in gastric juice.
- Molecular formula: C62H98N16O22
- Molecular weight: approximately 1419.5 g/mol
- Structure: linear, proline-rich N-terminal segment, no disulfide bonds
- Defined receptor: none identified
Because it has no known dedicated receptor, BPC-157 research is organized around signaling pathways. Preclinical cell-culture studies have examined VEGFR2 expression and the VEGFR2–Akt–eNOS axis in endothelial cells, nitric oxide signaling, the FAK-paxillin focal-adhesion pathway and ERK1/2 activation in fibroblasts. Lot documentation is available on the BPC-157 research peptide page.
What Is TB-500?
TB-500 is the market name for synthetic material based on thymosin beta-4 (Tβ4), a 43-residue, N-terminally acetylated peptide encoded by the TMSB4X gene. Depending on the supplier, TB-500 may be the full-length sequence (approximately 4.96 kDa) or the short acetylated fragment Ac-LKKTETQ, which contains the central actin-binding motif.
Thymosin beta-4 is a major G-actin-sequestering protein: it binds monomeric actin in a 1:1 complex and keeps it from adding to filament ends. Research with TB-500 therefore centres on actin polymerization dynamics, cell migration in vitro, and signaling pathways such as integrin-linked kinase (ILK)/Akt, angiopoietin/Tie2 and microRNA-146a. Lot documentation is on the TB-500 research peptide page.
BPC-157 vs TB-500: Side-by-Side Comparison
| Property | BPC-157 | TB-500 (thymosin beta-4) |
|---|---|---|
| Origin of sequence | Partial sequence of a gastric juice protein | Endogenous cytoplasmic protein (TMSB4X) |
| Length | 15 residues | 43 residues (or 7-residue fragment) |
| Approx. molecular weight | 1419.5 g/mol | ~4963 g/mol (full length) |
| N-terminal modification | None | Acetylated |
| Primary molecular partner | No defined receptor | Monomeric G-actin |
| Main research themes | VEGFR2, nitric oxide, FAK-paxillin signaling | Actin sequestration, cell migration, ILK/Akt, Tie2 |
| Identity method | Mass spectrometry | Mass spectrometry (sequence stated) |
| Purity method | RP-HPLC | RP-HPLC |
For a wider comparison that also covers Ipamorelin, CJC-1295, Sermorelin and Tesamorelin, see our research peptide comparison.
BPC-157 and TB-500 Blend: Analytical Considerations
NuRev also lists a pre-mixed BPC-157 / TB-500 blend in a single vial. Laboratories using a two-component material should check that the certificate of analysis addresses both components:
- identity of each peptide by mass spectrometry (two distinct expected masses);
- an HPLC chromatogram in which both main peaks are resolved and integrated;
- the stated nominal amount of each component per vial;
- the lot number linking the vial to its documentation.
When the experimental design calls for independent concentrations of each peptide, single-component vials offer more flexibility than a fixed-ratio blend.
How BPC-157 and TB-500 Are Characterized and Stored
Both peptides are released with a certificate of analysis reporting identity by mass spectrometry, purity by reverse-phase high-performance liquid chromatography, appearance and fill amount. For cell-based work, laboratories may additionally consider peptide content (the fraction of the solid that is peptide, as opposed to counter-ions and residual water) and endotoxin testing.
Lyophilized peptides are stored sealed, dry and protected from light at −20 °C for long-term storage. Vials should be allowed to reach room temperature before opening to limit condensation. Solutions prepared for assays are aliquoted so that each portion is thawed only once.
Purity and identity data for each lot are published on our Certificates of Analysis page, and our research-only disclaimer sets out terms of sale. NuRev supplies BPC-157 and TB-500 for laboratory research use only; it is not for human or veterinary use.