Public COA audit
TB-500 · Thymosin beta4
Audited September 5, 2026
Several fields check out, but we found issues worth reviewing before you rely on this document.
- Legitimacy
- 92
- Confidence
- 93%
- Panels
- 2/7
- Purity (printed)
- 99.59%
Scored high because the document is mostly consistent but carries soft concerns, limited panel coverage (2/7), and 1 soft concern. To improve: include identity, purity, and endotoxin at minimum.
Document details
Fields extracted from the certificate — not order or payment data.
- Batch / lot
- US1188/67 vial 2
- Identity method
- HPLC-UV-MS
- Sample date
- 2024-08-23
- Issue date
- 2024-08-29
Original certificate
Embedded copy of the stored COA PDF or image. Download it for your records — PeptIQ’s audit is separate from the lab document itself.
7-panel checklist
Had data + good, had data + bad, reported without pass/fail, or missing. Missing lowers thoroughness — you decide whether that panel matters; PeptIQ’s score still factors coverage.
2 of 7 present · 2 passed · 0 failed · 0 reported · 5 missing
Missing is a thoroughness gap — not automatically bad. PeptIQ’s legitimacy score still weighs panel coverage; you can down-weight panels that don’t matter for your use case.
Identity
Tested · passed · core
Compound identity confirmed (e.g. HPLC, mass spec).
4960.52 Da measured vs 4960.48 Da expected
Purity
Tested · passed · core
Reported purity percentage for the analyte.
99.59%
Heavy metals
Not on this certificate file
Lead, arsenic, cadmium, mercury, or similar limits.
No evidence on this file. Vendors sometimes publish separate purity and endotoxin reports for the same lot — check the brand page before treating this as “never tested.”
Microbial
Not on this certificate file
Bioburden / microbial limits testing.
No evidence on this file. Vendors sometimes publish separate purity and endotoxin reports for the same lot — check the brand page before treating this as “never tested.”
Endotoxin
Not on this certificate file · core
LAL or chromogenic endotoxin assay.
No evidence on this file. Vendors sometimes publish separate purity and endotoxin reports for the same lot — check the brand page before treating this as “never tested.”
Sterility
Not on this certificate file
Sterility testing where applicable.
No evidence on this file. Vendors sometimes publish separate purity and endotoxin reports for the same lot — check the brand page before treating this as “never tested.”
Residual solvent / water
Not on this certificate file
Residual solvents or water content limits.
No evidence on this file. Vendors sometimes publish separate purity and endotoxin reports for the same lot — check the brand page before treating this as “never tested.”
How to read this
Had data · good
Panel present with a pass (or clear acceptance).
Had data · bad
Panel present with a fail — a concrete quality signal.
Had data · unclear
Value reported without an explicit pass/fail mark.
Missing on this file
Not on this certificate file. Lowers file thoroughness; a sibling endotoxin/purity report for the same lot may still exist. PeptIQ’s score still factors coverage.
Findings
Evidence-linked observations from this audit.
High purity confirmed
99.59% purity by HPLC-UV with clear chromatogram showing dominant peak at 4.64 min. High purity is normal for research peptides.
Identity confirmed by mass spectrometry
Measured monoisotopic mass 4960.52 Da matches expected 4960.48 Da for TB-500 (Thymosin beta4). Multiple charge states visible in MS spectrum.
Batch/lot number present
Lot US1188/67 vial 2 clearly documented
Analysis and issue dates present
Analysis date 2024-08-23, issue date 2024-08-29. Both dates are reasonable and in the past relative to 2026-09-05.
Testing lab identified
MZ Biolabs, Tucson AZ, with analyst signature (Ken Pendarvis, ChE) and contact information
Limited testing scope - purity/identity only
This COA covers purity and identity testing only. No heavy metals, microbial, endotoxin, sterility, or residual solvent testing shown on these pages. This is a purity/identity-scoped report and does not indicate whether additional safety panels were performed separately.
Professional presentation
Clean formatting with lab logo, chromatograms, mass spectrum, PubChem reference, and explanatory notes about salts/buffers
Timing & next steps
Practical follow-ups based on document age and gaps.
coa age
This COA was issued over a year ago (737 days) — consider whether a retest is warranted for this batch.
PeptIQ COA reports analyze document content and publicly verifiable lab signals. They are educational and not a guarantee of product quality, legality, or safety. Always consult a qualified professional before making health decisions. We never publish purchase prices, shipping details, or uploader identity.