What Is TB-500 (Thymosin Beta-4)? A Research Overview

TB-500 is a synthetic peptide — the actin-binding fragment of thymosin β-4 (Tβ4), a naturally occurring 43-amino-acid protein. In the lab it is studied as a tissue-repair and cell-migration research compound. Supplied strictly for laboratory research use only — not for human or veterinary use.

Quick facts

• Class: synthetic peptide fragment of thymosin β-4
• Mechanism focus: G-actin binding / cytoskeletal regulation
• Form: lyophilized powder, ≥99% HPLC purity, third-party tested

What is TB-500?

TB-500 corresponds to the actin-binding region of thymosin β-4, retained in a shorter, more stable synthetic form. Because Tβ4 is a key regulator of actin — the protein that drives cell movement — TB-500 is widely used as a model compound in preclinical cell-migration and wound-repair research.

What does the research show?

Evidence is preclinical. Thymosin β-4 has been reported to accelerate dermal wound repair across multiple animal models — rats, aged mice, and diabetic (db/db) mice — with faster re-epithelialization versus controls. A broader scoping review mapped roughly 80 studies on Tβ4/TB-500 in tissue healing and musculoskeletal repair, weighted toward in-vitro and animal designs.

Mechanisms studied in the lab

• Actin regulation — binds G-actin monomers to influence filament turnover and cell migration
• Angiogenesis — supports endothelial-cell migration and new vessel formation
• Matrix remodeling — promotes matrix metalloproteinase expression during wound repair

Research status and safety

Findings are limited to laboratory and animal research. TB-500 is not approved for human use and there is limited clinical data; it is supplied for in-vitro research only.

Handling

Ships lyophilized — store cool and dark; reconstitute with bacteriostatic or sterile water down the vial wall, swirling gently. See TB-500 — ≥99% pure, third-party tested, learn how to reconstitute a research peptide, or browse more immunity & recovery research peptides.

FAQ

Is TB-500 the same as BPC-157? No — both are studied in tissue repair, but they are distinct compounds. Read about BPC-157.

Is TB-500 for human use? No. Research use only; not FDA-approved.

References

1. Philp D, et al. Thymosin β4 promotes matrix metalloproteinase expression during wound repair. 2006. PubMed
2. Thymosin β4 Promotes Dermal Healing. 2016. PubMed
3. Progress on the Function and Application of Thymosin β4. Front Endocrinol, 2021. PMC

For research use only. Not for human or veterinary use. Statements have not been evaluated by the FDA.