Thymosin Beta 4 (TB500) (20mg) Lot 26VTBL068: Certificate of Analysis (COA)
Paramount Peptides · tested May 7, 2026 by Accumark Labs · Older lot
This page summarizes the third-party lab report for lot 26VTBL068 of Thymosin Beta 4 (TB500) (20mg) sold by Paramount Peptides. The lot number on this page should match the lot printed on the vial label. Don't rely on this summary alone: use the button to open the lab's own record and compare the lot, date and results.
Thymosin Beta 4 (TB500) (20mg) lot 26VTBL068 test results, explained
Every result printed on this certificate, as reported by Accumark Labs, with a plain-English note on what the test measures. "Pass" and "specification" wording comes from the certificate; where the lab prints no pass/fail, we say so.
| Test | Result on the certificate | What it measures | This lot |
|---|---|---|---|
| HPLC purity | 99.62% · TB500 (17-23 Fragment) - Purity: 99.62% (spec > 98.0%; lab status: Conforms) | HPLC separates the sample into its components; purity is the share of the detected signal that sits in the main peak. On its own it doesn't show which molecule that peak is. That's what the identity test is for. | Meets the lab's specification (> 98.0%) |
| Identity (17-23 Fragment) | Conforms | Mass spectrometry measures the molecular mass of what's in the vial and compares it with the declared compound. "Confirmed" means the lab found the expected compound. | Reported as matching the declared compound |
| Quantity (measured content) | 23.59 mg | How much peptide the lab measured in the vial, compared with the amount printed on the label. | 118% of the 20 mg label amount |
Lot and report details
| Lot / batch number | 26VTBL068 |
|---|---|
| Product (as labeled by vendor) | Thymosin Beta 4 (TB500) (20mg) |
| Labeled vial size | 20 mg |
| Testing laboratory | Accumark Labs |
| Sample received by lab | May 4, 2026 |
| Report date | May 7, 2026 |
| Sample size tested | 20.0 mg |
| Sample type (lab's label) | Peptide |
| Verification code (Report ID) | ZCPL-FUP7 |
| Lab-record check | Lab's own record opened on Oct 7, 2026; lot number matched. |
| Vendor | Paramount Peptides |
| Verify | Open Accumark Labs's record ↗ |
The certificate itself
About Accumark Labs
An independent US analytical lab. Per its terms of use, Accumark Labs is a DBA of Valence Analytical LLC. Reports are published through AccuVerify, which shows each report from the lab's own records at a unique web address.
Accreditation: Accumark's website lists ISO/IEC 17025 accreditation as pending. We found no published accreditation certificate (checked Oct 7, 2026).
Tests: On the certificates here: HPLC purity, identity, quantity and, where ordered, endotoxin and a rapid sterility screen (PCR).
How to verify: Open accumarklabs.com/verify and enter the verification code (Report ID). The live record should show the same lot, dates and results as this page.
Open Accumark Labs's record ↗Lab info from: accumarklabs.com · Accumark terms of use · checked Oct 7, 2026.
Compound reference: TB-500 (thymosin beta-4)
- Also called
- TB-500; thymosin beta-4 fragment Ac-LKKTETQ; thymosin β4 (Tβ4)
- Sequence
- Ac-LKKTETQ (7 residues)
- Formula
- C38H68N10O14
- Mol. weight
- 889.0 g/mol
- CAS
- 885340-08-9
- Source
- PubChem CID 62707662 ↗
"TB-500" is used both for the 7-residue fragment Ac-LKKTETQ (PubChem's TB-500 record, shown here) and, on many vendor COAs, for full-length thymosin beta-4 (43 residues, PubChem CID 45382195). Check which molecule the identity line on a lot's COA names. Reference data only; it describes the molecule, not any use of it. For laboratory research use only.
TB-500 (thymosin beta-4) research profile · Where to get lab-tested TB-500 (thymosin beta-4)
Thymosin Beta 4 (TB500) (20mg) lot history at Paramount Peptides
All 4 certificates we have for this product from Paramount Peptides, newest first. The chart plots HPLC purity by report date (lots without a purity figure are left out). This lot is highlighted.
| Lot | Report date | Lab | HPLC purity |
|---|---|---|---|
| 26VTBC110 | May 15, 2026 | Accumark Labs | 99.39% |
| 26VTBL068 | May 7, 2026 | Accumark Labs | 99.62% |
| 26VTBLO68 | Apr 17, 2026 | Janoshik | 99.46% |
| TB420N111825 | Nov 28, 2025 | Janoshik | 99.55% |
Also available from Peptira
TB-500 (thymosin beta-4) is also carried by Peptira, our other tested supplier. These are the most recent TB-500 (thymosin beta-4) certificates we have from them; each links to its own lot page.
| Product | Lot | Report date | Lab | HPLC purity |
|---|---|---|---|---|
| TB-500 Vial 10 mg | TB5-10-005 | Apr 16, 2026 | Freedom Diagnostics | 99.25% |
| TB-500 Vial 10 mg | TB5-10-004 | Dec 18, 2025 | Freedom Diagnostics | 99.30% |
| TB-500 Vial 10 mg | TB5-10-003 | Nov 20, 2025 | Freedom Diagnostics | 99.44% |
| TB-500 Vial 10 mg | TB5-1-002 | Aug 13, 2025 | Janoshik | 99.94% |
| TB-500 Vial 10 mg | TB5-10-001 | Jul 16, 2025 | Janoshik | 99.86% |
Where to get lab-tested TB-500 (thymosin beta-4): products, sizes and latest COAs →
What to check on your vial
- The lot number on the vial label reads 26VTBL068, character for character.
- The product name and vial size on the label match Thymosin Beta 4 (TB500) (20mg) (20 mg).
- The lab's own record (accumarklabs.com, code ZCPL-FUP7) shows the same lot, report date (May 7, 2026) and results as this page.
- The report date is a date you'd expect for your purchase: a much older certificate may belong to an earlier lot.
- The identity line names the compound you expect. If it's "Not reported", the certificate doesn't confirm which molecule is in the vial.
- The certificate is a clean document: no mismatched fonts, edited numbers or a missing verification code.
How to check this COA in under a minute
- Find the lot number on your vial label and confirm it reads 26VTBL068.
- Open Accumark Labs's record with the button above, or go to accumarklabs.com and enter ZCPL-FUP7.
- Compare the lot number, test date, purity and identity result with the table above. They should be identical.
- New to COAs? Read How to read a peptide COA for what HPLC purity and mass spec identity mean.
Questions about lot 26VTBL068
What HPLC purity did Thymosin Beta 4 (TB500) (20mg) lot 26VTBL068 test at?
Accumark Labs reported 99.62% HPLC purity for lot 26VTBL068 in a report dated May 7, 2026.
How do I verify the COA for lot 26VTBL068?
Go to accumarklabs.com and enter the verification code (report id) ZCPL-FUP7. The lab's own record should show lot 26VTBL068 with the same dates and results as this page.
Is lot 26VTBL068 the newest Thymosin Beta 4 (TB500) (20mg) lot from Paramount Peptides?
No. The most recent Thymosin Beta 4 (TB500) (20mg) certificate we have from Paramount Peptides is lot 26VTBC110. Your vial label tells you which lot you have.
Does this certificate apply to my vial?
Only if the lot number printed on your vial reads 26VTBL068 exactly. A certificate of analysis covers one lot; it says nothing about other lots of the same product.
Other lots and COAs
Thymosin Beta 4 (TB500) (20mg) at Paramount Peptides
Lab-tested lot 26VTBL068 · 99.62% HPLC purity · Accumark Labs
Affiliate disclosure: We earn a commission if you buy through the vendor links on this page, at no extra cost to you. Peptides & Coffee is an independent COA reference and is not owned by or affiliated with the vendors or labs listed. Lab results are published by the vendors and labs; we link to each lab's own verification record so you can check them yourself. Stock and lots change: the vendor may be shipping a newer lot than the one on this page, so check your vial label.