{"kind":"compound","id":"tb-500","name":"TB-500","url":"https://costides.us/us/research/tb-500","last_verified":"2026-08-29","identity":{"cas":"885340-08-9","formula":"C38H68N10O14","mw":"889.0","sequence":"Ac-LKKTETQ","sequence_3letter":"Ac-Leu-Lys-Lys-Thr-Glu-Thr-Gln","residues":7,"pubchem":62707662,"identity_note":"Tβ4 17–23 actin-binding motif","parent_ligand":null},"chunks":[{"id":"lead-tb-500","type":"definition","heading":"What is TB-500?","text":"On Costides, TB-500 (SKU TB5) is the synthetic N-acetyl heptapeptide Ac-LKKTETQ (CAS 885340-08-9; average MW 889.0), corresponding to residues 17–23 of thymosin beta-4; it is not the full 43-residue N-acetyl protein timbetasin (CAS 77591-33-4; average MW 4963). For laboratory research use only; not for human or veterinary use.","words":48},{"id":"def-tb-500","type":"definition","heading":"TB-500 overview","text":"On Costides, TB-500 (SKU TB5) is the synthetic N-acetyl heptapeptide Ac-LKKTETQ (CAS 885340-08-9; average MW 889.0), corresponding to residues 17–23 of thymosin beta-4; it is not the full 43-residue N-acetyl protein timbetasin (CAS 77591-33-4; average MW 4963). For laboratory research use only; not for human or veterinary use. Synonyms and vendor codes indexed here include TB-500, N-acetyl-LKKTETQ. This page does not describe administration or dosing.","words":65},{"id":"id-tb-500","type":"identity","heading":"TB-500 chemical identity","text":"TB-500 chemical identity: CAS 885340-08-9; formula C38H68N10O14; average MW 889.0 Da; sequence Ac-LKKTETQ; 7 residues; PubChem CID 62707662. Values come from the Costides peptide research index.","words":26},{"id":"policy-tb-500","type":"policy","heading":"Research Use Only","text":"Research Use Only. Not for human or veterinary use. This page indexes chemical identity and citations. It is not medical advice and does not describe administration or dosing.","words":28},{"id":"pass-what-tb-500","type":"definition","heading":"What is TB-500?","text":"On Costides, TB-500 (SKU TB5) is the synthetic N-acetyl heptapeptide Ac-LKKTETQ (CAS 885340-08-9; average MW 889.0), corresponding to residues 17–23 of thymosin beta-4; it is not the full 43-residue N-acetyl protein timbetasin (CAS 77591-33-4; average MW 4963). For laboratory research use only; not for human or veterinary use.","words":48},{"id":"pass-human-tb-500","type":"definition","heading":"Is TB-500 for human use?","text":"No. TB-500 (N-acetyl-LKKTETQ) pages on Costides are Research Use Only reference materials. They are not medical advice and do not describe administration or dosing.","words":24},{"id":"pass-cas-tb-500","type":"definition","heading":"What is the CAS number of TB-500?","text":"The CAS number of TB-500 (N-acetyl-LKKTETQ) is 885340-08-9. Formula and molecular weight appear in the identity table when retrieved.","words":19},{"id":"pass-mw-tb-500","type":"definition","heading":"What is the molecular weight of TB-500?","text":"The average molecular weight of TB-500 (N-acetyl-LKKTETQ) listed on Costides is 889.0 Da.","words":13},{"id":"faq-tb-500-1","type":"faq","heading":"What is TB-500?","text":"On Costides, TB-500 (SKU TB5) is the synthetic N-acetyl heptapeptide Ac-LKKTETQ (CAS 885340-08-9; average MW 889.0), corresponding to residues 17–23 of thymosin beta-4; it is not the full 43-residue N-acetyl protein timbetasin (CAS 77591-33-4; average MW 4963). For laboratory research use only; not for human or veterinary use. The CAS number of TB-500 is 885340-08-9. Research Use Only. Not for human or veterinary use.","words":64},{"id":"faq-tb-500-2","type":"faq","heading":"What is the CAS number of TB-500?","text":"The CAS number of TB-500 (N-acetyl-LKKTETQ) is 885340-08-9. Formula and molecular weight appear in the identity table when retrieved.","words":19},{"id":"faq-tb-500-3","type":"faq","heading":"Is TB-500 for human use?","text":"No. TB-500 (N-acetyl-LKKTETQ) pages on Costides are Research Use Only reference materials. They are not medical advice and do not describe administration or dosing.","words":24},{"id":"faq-tb-500-4","type":"faq","heading":"What is the molecular weight of TB-500?","text":"The average molecular weight of TB-500 (N-acetyl-LKKTETQ) listed on Costides is 889.0 Da.","words":13},{"id":"faq-tb-500-5","type":"faq","heading":"Can I buy TB-500 from Costides?","text":"Yes. TB-500 may appear in the Costides catalog as a Research Use Only 10-pack when published. Check the product listing for SKU, price, and CoA lots.","words":26},{"id":"faq-tb-500-6","type":"faq","heading":"Where does identity data for TB-500 come from?","text":"Costides indexes registry and bibliographic sources (PubChem, CAS Common Chemistry, PubMed permalinks) when available. Outcome or efficacy claims are not restated on this page.","words":24},{"id":"cite-tb-500-1","type":"citation","heading":"PubChem CID 62707662","text":"PubChem CID 62707662. https://pubchem.ncbi.nlm.nih.gov/compound/62707662","words":4},{"id":"cite-tb-500-2","type":"citation","heading":"CAS Common Chemistry 885340-08-9","text":"CAS Common Chemistry 885340-08-9. https://commonchemistry.cas.org/detail?cas_rn=885340-08-9","words":5},{"id":"cite-tb-500-3","type":"citation","heading":"Therapeutic peptides in gerontology: mechanisms and applications for healthy aging.","text":"Therapeutic peptides in gerontology: mechanisms and applications for healthy aging.. PMID 42021992. https://pubmed.ncbi.nlm.nih.gov/42021992/","words":13},{"id":"cite-tb-500-4","type":"citation","heading":"DOI for PMID 42021992","text":"DOI for PMID 42021992. PMID 42021992. https://doi.org/10.3389/fragi.2026.1790247","words":7},{"id":"cite-tb-500-5","type":"citation","heading":"Safety and Efficacy of Approved and Unapproved Peptide Therapies for Musculoskeletal Injuries and Athletic Performance.","text":"Safety and Efficacy of Approved and Unapproved Peptide Therapies for Musculoskeletal Injuries and Athletic Performance.. PMID 41966639. https://pubmed.ncbi.nlm.nih.gov/41966639/","words":18},{"id":"cite-tb-500-6","type":"citation","heading":"DOI for PMID 41966639","text":"DOI for PMID 41966639. PMID 41966639. https://doi.org/10.1007/s40279-026-02437-0","words":7}],"faqs":[{"question":"What is TB-500?","answer":"On Costides, TB-500 (SKU TB5) is the synthetic N-acetyl heptapeptide Ac-LKKTETQ (CAS 885340-08-9; average MW 889.0), corresponding to residues 17–23 of thymosin beta-4; it is not the full 43-residue N-acetyl protein timbetasin (CAS 77591-33-4; average MW 4963). For laboratory research use only; not for human or veterinary use. The CAS number of TB-500 is 885340-08-9. Research Use Only. Not for human or veterinary use."},{"question":"What is the CAS number of TB-500?","answer":"The CAS number of TB-500 (N-acetyl-LKKTETQ) is 885340-08-9. Formula and molecular weight appear in the identity table when retrieved."},{"question":"Is TB-500 for human use?","answer":"No. TB-500 (N-acetyl-LKKTETQ) pages on Costides are Research Use Only reference materials. They are not medical advice and do not describe administration or dosing."},{"question":"What is the molecular weight of TB-500?","answer":"The average molecular weight of TB-500 (N-acetyl-LKKTETQ) listed on Costides is 889.0 Da."},{"question":"Can I buy TB-500 from Costides?","answer":"Yes. TB-500 may appear in the Costides catalog as a Research Use Only 10-pack when published. Check the product listing for SKU, price, and CoA lots."},{"question":"Where does identity data for TB-500 come from?","answer":"Costides indexes registry and bibliographic sources (PubChem, CAS Common Chemistry, PubMed permalinks) when available. Outcome or efficacy claims are not restated on this page."}],"links":[{"rel":"canonical","href":"https://costides.us/us/research/tb-500"},{"rel":"rag","href":"https://costides.us/api/rag/compound/tb-500"},{"rel":"cas","href":"https://costides.us/us/cas/885340-08-9"},{"rel":"product","href":"https://costides.us/us/products/tb-500-tb5"},{"rel":"llms","href":"https://costides.us/llms.txt"}]}