Independent side-by-side comparison of Peptide Gurus and Yiwu Aozuo Trading Firm — third-party lab grades, tested purity, COA availability, FDA warnings, and community ratings.
Bottom line: Peptide Gurus holds the stronger independent lab grade (D vs ungraded); Yiwu Aozuo Trading Firm shows higher average tested purity (99.9% vs 99.5%); Peptide Gurus has more published third-party tests (63 vs 2).
Every figure below is either measured by an independent laboratory or read from the vendor's own website, and the source is named against it. PeptideAtlas is not affiliated with either vendor.
Peptide Gurus: 63 independent Janoshik assays, across 58 substances, median measured purity 99.7%, most recent 2026-04-24. Yiwu Aozuo Trading Firm: 2 independent Janoshik assays, across 2 substances, median measured purity 99.9%, most recent 2025-01-24.
| Attribute | Peptide Gurus | Yiwu Aozuo Trading Firm |
|---|---|---|
| Independent lab grade | D | Not graded |
| Third-party tests | 63 tests, avg purity 99.5% | 2 tests, avg purity 99.9% |
| COA available | No | Yes |
| Endotoxin tested | No | No |
| FDA warnings | None on record | None on record |
| Substance | Peptide Gurus | Yiwu Aozuo Trading Firm |
|---|---|---|
| Tirzepatide 30mg | 99.84% (3 assays, latest 2026-04-14) | 99.91% (1 assay, latest 2025-01-24) |
| Retatrutide 10mg | 99.51% (3 assays, latest 2026-04-14) | Not tested |
| Tirzepatide 10mg | 99.79% (2 assays, latest 2026-04-14) | Not tested |
| Ss-31 40mg | 99.73% (1 assay, latest 2026-04-24) | Not tested |
| Wolverine(bpc-157 5mg Blend With Tb-500 5mg) | purity not reported (1 assay, latest 2026-04-23) | Not tested |
| Wolverine(bpc-157 10mg Blend With Tb-500 10mg) | purity not reported (1 assay, latest 2026-04-23) | Not tested |
| Pinealon 20mg | 99.17% (1 assay, latest 2026-04-14) | Not tested |
| Oxytocin 10mg | 97.53% (1 assay, latest 2026-04-14) | Not tested |
| Hcg 10,000 IU | purity not reported (1 assay, latest 2026-04-14) | Not tested |
| Pt-141 10mg | 99.90% (1 assay, latest 2026-04-14) | Not tested |
| Tesamorelin 10mg | 99.74% (1 assay, latest 2026-04-14) | Not tested |
| Retatrutide 5mg | 99.78% (1 assay, latest 2026-04-14) | Not tested |
Peptide Gurus. Peptide Gurus: 63 independent Janoshik assays, across 58 substances, median measured purity 99.7%, most recent 2026-04-24. Yiwu Aozuo Trading Firm: 2 independent Janoshik assays, across 2 substances, median measured purity 99.9%, most recent 2025-01-24. These are third-party Janoshik assays published against the vendor, not the vendor's own certificates.
Tirzepatide 30mg has been independently assayed for both. Peptide Gurus measured a median 99.84% across 3 assays; Yiwu Aozuo Trading Firm measured 99.91% across 1. Purity reflects the lots actually tested, not every batch either vendor sells.
Full profiles: Peptide Gurus, Yiwu Aozuo Trading Firm.
Full lab-test records: All 63 Peptide Gurus lab tests, All 2 Yiwu Aozuo Trading Firm lab tests.
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