Worst peptide COA results (past two weeks)
The worst third-party lab results we verified in the past two weeks, ranked by severity. Every accusation below links to a certificate you can check yourself. Snapshot for July 19, 2026.
Window widened to 14 days (fewer than 5 verifiable results in the last 3 days).-
1BPC-157 / guangzhou-lengiuanhuang-cosmeticsUnderfilled 100% below labelPurity 0.0% Dose -100% vs labelUnderfill
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2Underfill
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3Underfill
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4Underfill
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5Tirzepatide / vip-wellness-accessUnderfilled 47% below labelPurity 99.9% Dose -47% vs label Endotoxin: n/aUnderfill
How "worst" is decided
This page is a precomputed daily snapshot, not a live search. It ranks only lab results that carry a verifiable third-party certificate, so every entry can be independently checked. Unverified community and messaging-app uploads are never eligible.
Results are ranked by severity tier, then by magnitude within each tier:
- Tier 1 (severe): a failed endotoxin test, or a lab result that detected a different compound than the label claims.
- Tier 2 (underfill): the delivered dose measured 40% or more below the labeled amount.
- Tier 3 (low purity): everything else rankable, ordered by the lowest measured purity.
Named vendors are shown first; unnamed results only fill remaining slots. At most two results per vendor appear, so one bad batch cannot dominate the list. To verify any result yourself, follow its "Verify certificate" link to the issuing lab.