TB-500 is a synthetic peptide based on a fragment of thymosin beta-4 (Tβ4), a naturally occurring protein involved in cell migration and tissue organization. It is frequently studied alongside BPC-157 in tissue-repair research and is sold strictly as a research material — not as a drug, supplement, or product for human use.
Thymosin beta-4 and its fragments have been studied for several decades. In animal and in-vitro models, researchers have examined the molecule's relationship to:
These are areas of laboratory investigation, not established outcomes in people. The translational and clinical picture in humans remains an open research question. For background on thymosin beta-4 biology, see the peer-reviewed literature indexed at PubMed.
These two are the most-compared compounds in the repair-research space and are often studied together. We break down what the literature examines for each, side by side: BPC-157 vs TB-500 →
TB-500 is unscheduled under the Controlled Substances Act and is sold in the U.S. for research use only. The compounding-regulation landscape shifted in 2026 — read our breakdown of what changed: The 2026 FDA Peptide Reclassification, Explained.
Each vendor below is scored on purity, third-party COAs, shipping, and reputation. Prices are starting points and change often. Every link is an affiliate link and is disclosed.
| Vendor | From | Purity | 3rd-party COA | Shipping | |
|---|---|---|---|---|---|
| ZestyRat ResearchTop pick | $— | 99%+ | ✓ Every batch | US domestic | View & buy |
| Ascension PeptidesMost trusted | From $42 | 99.4% | ✓ Triple-verified | US · UPS | Buy → |
| Vendor C | $— | 99%+ | ✓ On request | US domestic | View & buy |
Vendor rows and pricing populate as affiliate partnerships are approved. Products listed are for laboratory and research purposes only — not for human consumption.
TB-500 is unscheduled and is sold in the U.S. strictly for research use only. It is not approved for human consumption. See our 2026 regulatory breakdown for the current details.
TB-500 is a synthetic peptide based on an active fragment/region of the larger, naturally occurring thymosin beta-4 protein. Research literature often uses the two terms in related contexts; they are not identical molecules.
Look for batch-specific, third-party Certificates of Analysis (COAs), transparent purity testing, U.S. sourcing, and a real reputation across independent review platforms. Our vendor reviews check all of these.
No. We're an independent research and comparison resource. We link to vetted third-party vendors and disclose every affiliate relationship.
Last reviewed June 2026. By Shaun Tucker, B.A. Psychology, author of The Quiet Close.
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