What Is TB-500?
TB-500 is a synthetic peptide corresponding to the central active region of Thymosin Beta-4, a small 43-amino acid protein that occurs naturally in nearly every human and animal cell type, with especially high concentrations in blood platelets and in the fluid of healing wounds. Rather than reproducing the full protein, TB-500 isolates the short segment containing the sequence LKKTETQ, the actin-binding domain that accounts for most of the parent protein's activity in published research. Working with the fragment instead of the full protein gives laboratories a smaller, more stable, and more economical tool for studying the same binding interaction.
The Actin Connection
Thymosin Beta-4 is the principal actin-sequestering molecule in mammalian cells. Actin is the structural protein that cells assemble and disassemble to change shape and move, and the cell keeps a large reserve of unpolymerized actin monomers on standby by binding them to Thymosin Beta-4. This places the protein, and by extension its active fragment, at the center of research on cell migration: how endothelial cells travel to form new vessels, how keratinocytes and fibroblasts move across a wound bed in culture, and how progenitor cells are recruited in tissue models. When researchers study TB-500, the actin-binding interaction is almost always the mechanism under examination.
TB-500 and BPC-157: Why They Are Studied Together
TB-500 is frequently discussed alongside BPC-157, but the two compounds could hardly be more different in origin. BPC-157 is a synthetic fragment derived from a protective protein found in gastric juice, while TB-500 comes from a ubiquitous actin-regulating protein. They act through unrelated mechanisms, which is precisely why repair-focused research programs often examine them as complementary rather than interchangeable tools. That pairing logic is the basis of our BPC-157 + TB-500 dual blend, and both compounds also anchor the multi-peptide GLOW and KLOW blends, where they are combined with GHK-Cu and, in KLOW, KPV. Researchers comparing single-compound and combination designs can find the exact per-component masses on each blend page.
Research Applications
The preclinical literature on Thymosin Beta-4 and its active fragment spans cell migration assays, angiogenesis models, dermal and corneal tissue studies, and cardiac tissue research, with the actin-binding mechanism as the common thread. TB-500's stability in solution relative to the full-length protein has made it a standard choice for in vitro work in these areas. All Heartland Bio Labs compounds are supplied strictly for laboratory research by qualified professionals.
Quality Verification
Every compound we stock is tested per product by an independent analytical laboratory, with identity confirmed by mass spectrometry and purity assessed by HPLC. Certificates of Analysis are published openly in our testing data library, and customers can match their vial to its certificate through the COA portal.
Handling and Storage
TB-500 is frequently studied alongside BPC-157, a pairing common enough to have earned its own nickname. Our guide to the wolverine peptide stack explains the name and how the two compounds differ in structure and mechanism.
TB-500 is supplied as a lyophilized powder in sealed vials. Store lyophilized vials refrigerated, protected from light and humidity. Once reconstituted with bacteriostatic water for laboratory use, keep solutions refrigerated and use them within the timeframe appropriate to the research protocol, avoiding repeated temperature cycling.
Reconstitution math
Work out concentration (mg/mL), amount per volume and molarity for any vial size with the TB-500 reconstitution calculator, general peptide calculator. For the bench procedure see how to reconstitute peptides.
Research Use Only
This product is sold for laboratory research use only. It is not for human or veterinary use, not a drug, food, or cosmetic, and may not be used in diagnostics or therapeutics. By purchasing, the buyer confirms they are a qualified researcher and accepts our terms of sale.
