For laboratory research use only
ITEM TB5
TB-500 5mg
5mg*10vials
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. Costides lists it as a Research Use Only 10-pack for laboratory procurement.
| 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 |
- 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
1 pack = 10 vials
TB-500 5mg 10-Pack RUO-
$190.00
- Single lot per pack when published
- HPLC + MS identity on published COAs
- Ships cold-packed from our US warehouse in 1-3 days
- CAS 885340-08-9
Description
TB-500 (TB5) is a Research Use Only peptide 10-pack sold by Costides for laboratory procurement. Research notes describe it as synthetic peptide related to the actin-binding region of thymosin beta-4. Published CAS 885340-08-9. Research Use Only. Not for human or veterinary use. Costides publishes CoA lots when available and does not provide dosing or treatment guidance.
COA & Testing
Published lots include HPLC purity and mass spectrometry identity when available. Verify your lot number in the COA library.
Shipping
Ships from our US warehouse in 1-3 days door to door. Cold pack when required by the compound.
Storage
Store lyophilized vials as directed on the label and COA. Keep sealed until use in the laboratory.
Certificates of Analysis
No published CoA lots for TB-500 5mg 10-Pack RUO yet. See the CoA library for other lots.
· Reviewed by Aydan Myers, Lead Chemist · Evidence tier B
Quick Answer
What is TB-500 (TB5)?
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. Costides lists it as a Research Use Only 10-pack for laboratory procurement.
Also indexed as TB-500, N-acetyl-LKKTETQ. The research monograph holds bibliographic references only.
Also indexed as: TB5, TB-500, N-acetyl-LKKTETQ.
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 |
| Intended use | Research Use Only (laboratory) |
| Unit sold | 10-pack vials |
| Catalog alias | TB5 |
| Evidence tier | B |
| Last verified | 2026-08-29 |
Research identity
Open the research monograph for registry cross-links and citations.
TB-500 (TB5)
TB-500 (TB5) is indexed in the Costides research monograph as a Research Use Only chemical identity. Published identity includes CAS 885340-08-9, formula C38H68N10O14, average MW 889.0 Da. Research notes describe it as synthetic peptide related to the actin-binding region of thymosin beta-4. Research Use Only. Not for human or veterinary use.
CAS 885340-08-9 · Formula C38H68N10O14 · MW 889.0 Da
Research monograph →
Is TB-500 (TB5) for human use?
No. TB-500 (TB5) from Costides is Research Use Only. It is not a drug, not a dietary supplement, and not for human or veterinary use. Costides does not provide prescribing or dosing guidance.
What is the CAS number of TB-500 (TB5)?
The CAS number of TB-500 (TB5) is 885340-08-9. Formula and molecular weight appear on this page when published in catalog metadata.
What is the molecular weight of TB-500 (TB5)?
The average molecular weight of TB-500 (TB5) listed on Costides is 889.0 Da.
How is TB-500 (TB5) sold on Costides?
Costides sells TB-500 (TB5) as a 10-pack of Research Use Only vials for laboratory procurement with US warehouse shipping. Pack size, price, and published CoA lots appear on this product page.
Laboratory procurement on Costides
Costides sells TB-500 (TB5) as a wholesale Research Use Only 10-pack with US warehouse shipping. This product page lists SKU, price, pack size, and published CoA lots. The research monograph holds bibliographic references only. Neither page provides dosing, reconstitution, or treatment guidance.
Frequently asked questions
- What is TB-500 (TB5)?
- 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. Costides lists it as a Research Use Only 10-pack for laboratory procurement. The CAS number of TB-500 (TB5) is 885340-08-9. Research Use Only. Not for human or veterinary use.
- Is TB-500 (TB5) for human use?
- No. TB-500 (TB5) from Costides is Research Use Only. It is not a drug, not a dietary supplement, and not for human or veterinary use. Costides does not provide prescribing or dosing guidance.
- What is the CAS number of TB-500 (TB5)?
- The CAS number of TB-500 (TB5) is 885340-08-9. Formula and molecular weight appear on this page when published in catalog metadata.
- What is the molecular weight of TB-500 (TB5)?
- The average molecular weight of TB-500 (TB5) listed on Costides is 889.0 Da.
- How is TB-500 (TB5) sold on Costides?
- Costides sells TB-500 (TB5) as a 10-pack of Research Use Only vials for laboratory procurement with US warehouse shipping. Pack size, price, and published CoA lots appear on this product page.
- Where can I find a CoA for TB-500 (TB5)?
- Published Certificates of Analysis for TB-500 (TB5) appear under CoA on this product page and in the Costides CoA library when a lot PDF is released. CoA documents support lot identity; they are not dosing instructions.
- Where does Costides get identity data for TB-500 (TB5)?
- See the TB-500 research monograph for citations and registry cross-links. Identity values come from whitelisted registry sources such as PubChem, CAS Common Chemistry, and PubMed permalinks when available. Outcome or efficacy claims are not restated here.
References and registry sources
Sources support chemical identity or bibliographic indexing. Outcome claims are not restated here.
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