Single peptide
TB-4 Fragment 17-23
10 mg
$38$3.80/mg
Single peptideBPC-157 & thymosin peptidesPre-order
TB-500
Synthetic thymosin beta-4, a 43-amino-acid actin-binding peptide.
$59$5.90/mg
- Form: lyophilized (freeze-dried) powder, sealed vial
- Certificate of analysis: batch 026-A87-TSX, HPLC purity 99.0% — view PDF (1 more)
- Shipping: pre-orders ship after the batch certificate of analysis is posted from the USA · free over $150
- Payment: Cash App, PayPal, Venmo, Coinbase or Bitcoin — how it works
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For laboratory research use only. Not for human or veterinary use.
Compound identity
| Compound | Formula | Mol. weight | CAS | PubChem |
|---|---|---|---|---|
| TB-500 | C212H350N56O78S | 4963 g/mol | 77591-33-4 | CID 16132341 |
Reference identity data from PubChem where listed. Each batch's purity data is on its certificate of analysis on the lab results page.
Research overview
TB-500 is sold as synthetic thymosin beta-4 (INN: timbetasin), a 43-amino-acid peptide.
Research has examined thymosin beta-4 in cell and animal models of connective tissue and corneal injury, including its role in fibrosis signaling 12. It is one of six peptides reviewed in a 2026 American Journal of Sports Medicine paper 3.
References
Where this research was done: 
China (3), 
United States (3), 
Germany (1), 
United Kingdom (1)
- Thymosin beta4 and the anti-fibrotic switch. Int Immunopharmacol, 2023. PubMed 36580759
- Protection effect of thymosin beta4 on ethanol injury in corneal stromal keratocyte. BMC Ophthalmol, 2022. PubMed 35062902
- Peptide Supplements and Their Therapeutic Applications in Sports Medicine. Am J Sports Med, 2026. PubMed 42578445
- Recombinant human thymosin beta 4 improves ischemic cardiac dysfunction in mice and patients with acute ST-segment elevation myocardial infarction after reperfusion. Cardiovasc Res, 2025. PubMed 41229390
- Thymosin beta4: a multi-functional regenerative peptide. Basic properties and clinical applications. Expert Opinion on Biological Therapy, 2012. PubMed 22074294
- beta-Thymosins. Annals of the New York Academy of Sciences, 2007. PubMed 17468232
- Loss of endogenous thymosin beta4 accelerates glomerular disease. Kidney International, 2016. PubMed 27575556
- Thymosin beta 4 as an Alzheimer disease intervention target identified using human brain organoids. Stem Cell Reports, 2025. PubMed 40816274
Also searched as: TB500, Thymosin Beta-4.
Storage
Store sealed vials cold, dry and away from light. Lyophilized peptides are typically kept at −20 °C for long-term storage.
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