Public COA audit
TB-500 · Thymosin beta4
Audited July 28, 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)
- 99.67%
Document details
Fields extracted from the certificate — not order or payment data.
- Batch / lot
- 1154 vial 1
- Identity method
- HPLC-UV-MS
- Sample date
- 2024-08-23
- Issue date
- 2024-08-29
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).
4960.49 Da measured vs 4960.48 Da expected
Purity
Tested · passed · core
Reported purity percentage for the analyte.
99.67%
Heavy metals
Not on this COA
Lead, arsenic, cadmium, mercury, or similar limits.
No evidence for this panel. That lowers thoroughness — whether it matters depends on what you care about.
Microbial
Not on this COA
Bioburden / microbial limits testing.
No evidence for this panel. That lowers thoroughness — whether it matters depends on what you care about.
Endotoxin
Not on this COA · core
LAL or chromogenic endotoxin assay.
No evidence for this panel. That lowers thoroughness — whether it matters depends on what you care about.
Sterility
Not on this COA
Sterility testing where applicable.
No evidence for this panel. That lowers thoroughness — whether it matters depends on what you care about.
Residual solvent / water
Not on this COA
Residual solvents or water content limits.
No evidence for this panel. That lowers thoroughness — whether it matters depends on what you care about.
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
Not on this certificate. Lowers thoroughness; you decide if that panel matters for your use case. PeptIQ’s score still factors coverage.
Findings
Evidence-linked observations from this audit.
High purity confirmed
HPLC-UV shows 99.67% purity with clear chromatogram showing TB-500 as dominant peak at 4.63 min. Minor impurities total 0.33%.
Molecular weight confirmed
Mass spectrometry confirms monoisotopic mass 4960.49 Da vs expected 4960.48 Da (0.01 Da difference, well within tolerance). Multiple charge states visible in MS spectrum.
Batch information present
Lot number 1154 vial 1 clearly stated with client information (Limitless Life Nootropics).
Dates appropriate
Analysis date 2024-08-23, issue date 2024-08-29 (6 days later, reasonable turnaround). Both dates are in the past relative to 2026-07-28.
Lab identification complete
MZ Biolabs, 1635 E 18th St, Tucson, AZ 85719. Analyst Ken Pendarvis, ChE identified. Contact information and website provided.
Limited testing scope
Only purity and identity panels performed. No heavy metals, microbial, endotoxin, sterility, or residual solvent testing. This is common for research-grade peptides but limits comprehensive safety assessment.
Professional presentation
Well-formatted COA with clear chromatograms, peak tables, MS spectrum, and appropriate technical notes about salts/buffers. PubChem CID reference included for verification.
Timing & next steps
Practical follow-ups based on document age and gaps.
coa age
This COA was issued over a year ago (698 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.