Thymagen Vial 20 mg Lot TGEN20-001: Certificate of Analysis (COA)
Peptira · tested May 28, 2026 by Freedom Diagnostics · Most recent COA
This page summarizes the third-party lab report for lot TGEN20-001 of Thymagen Vial 20 mg sold by Peptira. 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.
Thymagen Vial 20 mg lot TGEN20-001 test results, explained
Every result printed on this certificate, as reported by Freedom Diagnostics, 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 | 99.48% · Per-vial HPLC purity: 99.48%, 99.51%, 99.46% | 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. | No pass/fail printed; reported value at or above 98% |
| Identity (LC-MS) | Confirmed · compound named: Thymogen | 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. Expected average molecular weight of Thymagen (Thymogen) (PubChem): 333.34 g/mol. The observed mass appears in the certificate's chart and isn't transcribed here. | Reported as matching the declared compound |
| Quantity (measured content) | per vial: 20.67 mg, 19.81 mg, 21.52 mg | How much peptide the lab measured in the vial, compared with the amount printed on the label. | Reported |
| Appearance | White Lyophilized Powder | What the lab recorded before testing: the colour and physical form of the material. | Recorded |
| Endotoxin (LAL assay (USP <85>)) | Pass (LAL, USP <85>) | Bacterial endotoxins are fragments of bacterial cell walls. The LAL assay measures them in endotoxin units (EU/mL); a pass means the result was under the lab's limit. | Pass (as reported by the lab) |
| Microbial screen (PCR) | Pass | A DNA-based (PCR) screen for common microbial contamination. It is a rapid screen, not a full sterility test. Test as named on the certificate: Microbial DNA (PCR). | Pass (as reported by the lab) |
| Fentanyl screen | Negative | A screen for fentanyl contamination. | Pass (as reported by the lab) |
Lot and report details
| Lot / batch number | TGEN20-001 |
|---|---|
| Product (as labeled by vendor) | Thymagen Vial 20 mg |
| Labeled vial size | 20 mg |
| Testing laboratory | Freedom Diagnostics |
| Sample received by lab | May 26, 2026 |
| Report date | May 28, 2026 |
| Method (as stated) | HPLC with UV detection coupled with mass spectrometry (LC-MS) |
| Search Code | Pept2605260487 |
| Lab-record check | Lab's own record opened on Oct 7, 2026; lot number matched. |
| Vendor | Peptira |
| Verify | Open Freedom Diagnostics's record ↗ |
Data notes: Lab received 05/26/2026, reported 05/28/2026 (MM/DD/YYYY).
The certificate itself
About Freedom Diagnostics
A peptide testing lab in Franklin, Tennessee (per the lab's website) that publishes its certificates in a searchable online database.
Accreditation: No accreditation is printed on these certificates, and we found no published ISO/IEC 17025 accreditation for the lab (checked Oct 7, 2026).
Tests: On the certificates here: HPLC purity with LC-MS identity, net content and, where ordered, endotoxin (LAL), a microbial PCR screen and other screens.
How to verify: Search the Search Code on freedomdiagnosticstesting.com. The lab hosts its own PDF copy of each certificate, which should match the vendor's copy.
Open Freedom Diagnostics's record ↗Lab info from: freedomdiagnosticstesting.com · checked Oct 7, 2026.
Compound reference: Thymagen (Thymogen)
- Also called
- oglufanide; Glu-Trp dipeptide
- Sequence
- EW (2 residues)
- Formula
- C16H19N3O5
- Mol. weight
- 333.34 g/mol
- Source
- PubChem CID 100094 ↗
The dipeptide L-Glu-L-Trp. Reference data only; it describes the molecule, not any use of it. For laboratory research use only.
Thymagen (Thymogen) research profile · Where to get lab-tested Thymagen (Thymogen)
Also available from Paramount Peptides
Thymagen (Thymogen) is also carried by Paramount Peptides, our other tested supplier. These are the most recent Thymagen (Thymogen) certificates we have from them; each links to its own lot page.
| Product | Lot | Report date | Lab | HPLC purity |
|---|---|---|---|---|
| Thymagen (Thymogen) (20mg) | TYG20N021126 | Feb 24, 2026 | Janoshik | 99.57% |
| Thymagen (Thymogen) (20mg) | TYG20N062725 | Jul 29, 2025 | Janoshik | 99.86% |
Where to get lab-tested Thymagen (Thymogen): products, sizes and latest COAs →
What to check on your vial
- The lot number on the vial label reads TGEN20-001, character for character.
- The product name and vial size on the label match Thymagen Vial 20 mg (20 mg).
- The lab's own record (freedomdiagnosticstesting.com, code Pept2605260487) shows the same lot, report date (May 28, 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 TGEN20-001.
- Open Freedom Diagnostics's record with the button above, or go to freedomdiagnosticstesting.com and enter Pept2605260487.
- 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 TGEN20-001
What HPLC purity did Thymagen Vial 20 mg lot TGEN20-001 test at?
Freedom Diagnostics reported 99.48% HPLC purity for lot TGEN20-001 in a report dated May 28, 2026.
How do I verify the COA for lot TGEN20-001?
Go to freedomdiagnosticstesting.com and enter the search code Pept2605260487. The lab's own record should show lot TGEN20-001 with the same dates and results as this page.
Is lot TGEN20-001 the newest Thymagen Vial 20 mg lot from Peptira?
It's the most recent Thymagen Vial 20 mg certificate we have on file from Peptira as of Oct 8, 2026. Vendors can ship a newer lot before its certificate is posted, so check your vial label.
Does this certificate apply to my vial?
Only if the lot number printed on your vial reads TGEN20-001 exactly. A certificate of analysis covers one lot; it says nothing about other lots of the same product.
Other lots and COAs
Thymagen Vial 20 mg at Peptira
Lab-tested lot TGEN20-001 · 99.48% HPLC purity · Freedom Diagnostics
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.