TB-500 is a synthetic peptide related to thymosin β4 (Tβ4) that researchers use as a reagent to study tissue repair. This article explains what TB-500 is, why it draws lab interest, and how it compares to BPC-157. The content is research-use-only (RUO) and is not medical advice.
What TB-500 is
Tβ4 is a natural 43-amino-acid peptide. Its main job in the cell is to bind monomeric G-actin and hold it in reserve. Because of that function, Tβ4 shapes how fast a cell rebuilds its cytoskeleton, moves and changes shape. On the research market, "TB-500" usually denotes synthetic Tβ4 or its active fragment.
Why it is studied
In preclinical work, Tβ4 sped wound closure and raised the density of new vessels versus controls. Researchers have also described effects in heart, corneal and vessel-growth models. One thing matters here: all of these data come from animal and cell systems, not approved clinical protocols. A detailed, referenced write-up sits in the TB-500 monograph.
TB-500 vs BPC-157
These are two different molecules with different mechanisms. BPC-157 is a short gastric-derived peptide, while TB-500 acts through actin binding. Researchers often compare them in a regeneration context, and a combined form exists on the market. If you want a single molecule, see BPC-157; the combination is available as BPC-157 + TB-500.
Quality and batch verification
Every unit carries a lot number. Batches ship with a COA (certificate of analysis) from an independent third-party lab. That lab is not an "accredited" body, but an outside lab that runs an independent analysis of the sample. We publish the reports in an open archive, so you can check a specific lot's purity yourself: COA archive.
Where to go next
Order the reagent on the TB-500 page. Reconstitution figures from general sources are collected in the reconstitution reference.