TB-500 (Thymosin β4)

TB-500 is the synthetic, research-grade form of a naturally occurring peptide called thymosin β4 (Tβ4), one of the most abundant actin-binding proteins inside cells. In the laboratory it is studied for its role in cell movement, blood-vessel formation, and tissue repair. This page summarizes what TB-500 is and how it is described in the scientific literature, for informational purposes only.

How TB-500 (thymosin β4) works

Thymosin β4 is the principal G-actin–sequestering molecule in mammalian cells. By binding free actin monomers, it helps control when and where those monomers polymerize into the actin filaments that drive cell shape and movement. Through this regulation of the actin cytoskeleton, Tβ4 has been linked in research models to cell migration, angiogenesis (new blood-vessel growth), and anti-inflammatory activity — processes central to how tissues remodel after injury.

Reported effects in the research literature

Most published work on thymosin β4 comes from cell-culture and animal studies, with a smaller number of early-stage human trials. In preclinical models, Tβ4 has been reported to accelerate dermal and corneal wound healing, increase reepithelialization and collagen deposition, promote capillary in-growth, and reduce inflammation. It has also been investigated for repair after hypoxic injury to organs such as the heart. Early-phase clinical work has explored topical and injected Tβ4 for wounds such as pressure and stasis ulcers.

It is important to keep this evidence in perspective: results are largely preclinical, human data remain limited, and TB-500 is not an approved medicine. Findings in animals do not necessarily translate to people. The references below point to primary and authoritative sources for readers who want to go deeper.

Handling and storage notes

Like most lyophilized peptides, thymosin β4 is generally kept cold and protected from light before reconstitution, then refrigerated and used within a limited window once dissolved. To work out concentration and volume after reconstitution, use the free VialHelp reconstitution calculator, the concentration & volume converter, and the protocol tracker for record-keeping. See the full peptide library for related compounds.

Related compounds and guides

• BPC-157 — another peptide frequently studied in tissue-repair research.
• GHK-Cu — copper tripeptide investigated for skin and connective-tissue remodeling.
• Browse the full peptide library for more compound profiles.
• How to reconstitute peptides — step-by-step reconstitution method and concentration math.
• Sterile technique — aseptic handling and contamination prevention for research vials.

For informational use only. Not medical advice; consult a qualified healthcare professional. 21+.