TIRZ-2 Vial 20 mg Lot TIRZ20-004: Certificate of Analysis (COA)
Peptira · tested Oct 24, 2025 by Freedom Diagnostics · Older lot
This page summarizes the third-party lab report for lot TIRZ20-004 of TIRZ-2 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.
TIRZ-2 Vial 20 mg lot TIRZ20-004 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 | 99.935% | 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) | Mass identified as GLP-TZ · compound named: GLP-TZ · mass identification table: GLP-TZ: 99.935% | 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 |
| Appearance | White Lyophilized Powder | What the lab recorded before testing: the colour and physical form of the material. | Recorded |
Lot and report details
| Lot / batch number | TIRZ20-004 |
|---|---|
| Product (as labeled by vendor) | TIRZ-2 Vial 20 mg |
| Labeled vial size | 20 mg |
| Testing laboratory | Freedom Diagnostics |
| Sample received by lab | Oct 22, 2025 |
| Report date | Oct 24, 2025 |
| Method (as stated) | HPLC with UV detection coupled with mass spectrometry (LC-MS) |
| Search Code | PEPT2510220036 |
| Lab-record check | On Oct 7, 2026 the vendor's PDF was byte-for-byte identical to the copy hosted on the lab's site. |
| Vendor | Peptira |
| Verify | Open Freedom Diagnostics's record ↗ |
Data notes: Lab received 10/22/2025, reported 10/24/2025 (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.
TIRZ-2 Vial 20 mg lot history at Peptira
All 6 certificates we have for this product from Peptira, 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 |
|---|---|---|---|
| TIRZ20-006 | Apr 2, 2026 | Freedom Diagnostics | 99.92% |
| TIRZ20-005 | Oct 24, 2025 | Freedom Diagnostics | 99.96% |
| TIRZ20-004 | Oct 24, 2025 | Freedom Diagnostics | 99.94% |
| TIRZ20-003 | Sep 12, 2025 | Freedom Diagnostics | 99.82% |
| TIRZ20-002 | Aug 28, 2025 | Janoshik | 99.89% |
| TIRZ20-001 | Jun 25, 2025 | Janoshik | 99.61% |
What to check on your vial
- The lot number on the vial label reads TIRZ20-004, character for character.
- The product name and vial size on the label match TIRZ-2 Vial 20 mg (20 mg).
- The lab's own record (freedomdiagnosticstesting.com, code PEPT2510220036) shows the same lot, report date (Oct 24, 2025) 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 TIRZ20-004.
- Open Freedom Diagnostics's record with the button above, or go to freedomdiagnosticstesting.com and enter PEPT2510220036.
- 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 TIRZ20-004
What HPLC purity did TIRZ-2 Vial 20 mg lot TIRZ20-004 test at?
Freedom Diagnostics reported 99.94% HPLC purity for lot TIRZ20-004 in a report dated Oct 24, 2025.
How do I verify the COA for lot TIRZ20-004?
Go to freedomdiagnosticstesting.com and enter the search code PEPT2510220036. The lab's own record should show lot TIRZ20-004 with the same dates and results as this page.
Is lot TIRZ20-004 the newest TIRZ-2 Vial 20 mg lot from Peptira?
No. The most recent TIRZ-2 Vial 20 mg certificate we have from Peptira is lot TIRZ20-006. 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 TIRZ20-004 exactly. A certificate of analysis covers one lot; it says nothing about other lots of the same product.
Other lots and COAs
TIRZ-2 Vial 20 mg at Peptira
Lab-tested lot TIRZ20-004 · 99.94% 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.