Public COA audit

TB-500 · Thymosin beta4

Audited July 28, 2026

Mostly consistent, with concerns

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%

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

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 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 99.59% purity with clear dominant peak at 4.64 min. Chromatogram shows minimal impurities (0.19%, 0.05%, 0.13%, 0.04% in other peaks).

  • Molecular weight confirmed

    Mass spectrometry confirms identity with measured monoisotopic mass 4960.52 Da vs expected 4960.48 Da (0.04 Da difference, well within acceptable tolerance). Multiple charge states visible in MS spectrum.

  • Batch information complete

    Lot number US1188/67 vial 2 clearly stated with client information (Limitless Life Nootropics).

  • Dates appropriate

    Analysis date 2024-08-23, issue date 2024-08-29 (6-day turnaround is reasonable). Both dates are in the past relative to 2026-07-28.

  • Lab credentials present

    MZ Biolabs, 1635 E 18th St, Tucson, AZ 85719. Analyst Ken Pendarvis, ChE identified. Contact information and website provided. Signature present on both pages.

  • Limited testing scope

    Only identity and purity 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 two-page report with clear chromatograms, mass spectrum, peak tables, and appropriate technical notes about salts/buffers not being detected by UV.

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.