Research Use Only
TB-500
· Reviewed by Aydan Myers, Lead Chemist · Evidence tier B
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.
Key facts
| Sequence | Ac-LKKTETQ |
|---|---|
| Sequence (3-letter) | Ac-Leu-Lys-Lys-Thr-Glu-Thr-Gln |
| Residues | 7 |
| CAS Registry Number | 885340-08-9 |
| Molecular formula | C38H68N10O14 |
| Average molecular weight | 889.0 Da |
| PubChem CID | 62707662 |
| Identity | Tβ4 17–23 actin-binding motif |
| InChIKey | ADKDNDYYIZUVCZ-ZQNQAVPYSA-N |
| Page type | Research identity monograph |
| Intended use | Research Use Only (reference) |
| Synonyms | TB-500, N-acetyl-LKKTETQ |
| Research notes | synthetic peptide related to the actin-binding region of thymosin beta-4 |
| Evidence tier | B |
| Last verified | 2026-08-29 |
Is TB-500 for human use?
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.
What is the CAS number of TB-500?
The CAS number of TB-500 (N-acetyl-LKKTETQ) is 885340-08-9. Formula and molecular weight appear in the identity table when retrieved.
What is the molecular weight of TB-500?
The average molecular weight of TB-500 (N-acetyl-LKKTETQ) listed on Costides is 889.0 Da.
Chemical identity table
| Sequence | Ac-LKKTETQ |
|---|---|
| Sequence (3-letter) | Ac-Leu-Lys-Lys-Thr-Glu-Thr-Gln |
| Residues | 7 |
| CAS Registry Number | 885340-08-9 |
| Molecular formula | C38H68N10O14 |
| Average molecular weight | 889.0 Da |
| PubChem CID | 62707662 |
| Identity | Tβ4 17–23 actin-binding motif |
| InChIKey | ADKDNDYYIZUVCZ-ZQNQAVPYSA-N |
| Synonyms | TB-500, N-acetyl-LKKTETQ |
Catalog 10-packs
- TB5 — TB-500 5mg 10-Pack RUO
- BB10 — BPC 5mg + TB 5mg (Wolverine) 10-Pack RUOBPC 5mg + TB-500 5mg
- GLOW — BPC-157 10mg+GHK-Cu 50mg+TB-500 10mg 10-Pack RUOBPC 10mg + TB-500 10mg + GHK-Cu 50mg
- KLOW — BPC-157 10mg+GHK-Cu 50mg+TB-500 10mg+KPV 10mg (KLOW) 10-Pack RUOBPC 10mg + TB-500 10mg + KPV 10mg + GHK-Cu 50mg
Frequently asked questions
- What is TB-500?
- 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.
- What is the CAS number of TB-500?
- The CAS number of TB-500 (N-acetyl-LKKTETQ) is 885340-08-9. Formula and molecular weight appear in the identity table when retrieved.
- Is TB-500 for human use?
- 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.
- What is the molecular weight of TB-500?
- The average molecular weight of TB-500 (N-acetyl-LKKTETQ) listed on Costides is 889.0 Da.
- Can I buy TB-500 from Costides?
- 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.
- Where does identity data for TB-500 come from?
- Costides indexes registry and bibliographic sources (PubChem, CAS Common Chemistry, PubMed permalinks) when available. Outcome or efficacy claims are not restated on this page.
Citations
- PubChem CID 62707662
- CAS Common Chemistry 885340-08-9
- Therapeutic peptides in gerontology: mechanisms and applications for healthy aging. PMID 42021992
- DOI for PMID 42021992 PMID 42021992
- Safety and Efficacy of Approved and Unapproved Peptide Therapies for Musculoskeletal Injuries and Athletic Performance. PMID 41966639
- DOI for PMID 41966639 PMID 41966639
- Therapeutic Peptides in Orthopaedics: Applications, Challenges, and Future Directions. PMID 41490200
- DOI for PMID 41490200 PMID 41490200