Independent side-by-side comparison of Mei Peptide and Yiwu Aozuo Trading Firm — third-party lab grades, tested purity, COA availability, FDA warnings, and community ratings.
Bottom line: Yiwu Aozuo Trading Firm shows higher average tested purity (99.9% vs 99.2%); Mei Peptide has more published third-party tests (8 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.
Mei Peptide: 8 independent Janoshik assays, across 8 substances, median measured purity 99.1%, most recent 2025-11-20. Yiwu Aozuo Trading Firm: 2 independent Janoshik assays, across 2 substances, median measured purity 99.9%, most recent 2025-01-24.
| Attribute | Mei Peptide | Yiwu Aozuo Trading Firm |
|---|---|---|
| Third-party tests | 8 tests, avg purity 99.2% | 2 tests, avg purity 99.9% |
| COA available | No | Yes |
| Endotoxin tested | No | No |
| FDA warnings | None on record | None on record |
| Substance | Mei Peptide | Yiwu Aozuo Trading Firm |
|---|---|---|
| Tirzepatide 30mg | 99.78% (1 assay, latest 2025-07-22) | 99.91% (1 assay, latest 2025-01-24) |
| KLOW (ghk Or Ghk-cu/ Tb-500/ Bpc-157/ Kpv) | purity not reported (1 assay, latest 2025-11-20) | Not tested |
| Sermorelin | 99.01% (1 assay, latest 2025-11-19) | Not tested |
| Cjc-1295 With DAC 5 | 98.28% (1 assay, latest 2025-11-19) | Not tested |
| Tesamorelin 10mg | 99.08% (1 assay, latest 2025-07-19) | Not tested |
| Retatrutide 10mg | 99.66% (1 assay, latest 2025-07-19) | Not tested |
| Nad+500 | purity not reported (1 assay, latest 2025-07-18) | Not tested |
| Bpc5mg+tb5mg Blend | purity not reported (1 assay, latest 2025-07-18) | Not tested |
| Retatrutide 30mg | Not tested | 99.81% (1 assay, latest 2025-01-24) |
Mei Peptide. Mei Peptide: 8 independent Janoshik assays, across 8 substances, median measured purity 99.1%, most recent 2025-11-20. 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. Mei Peptide measured a median 99.78% across 1 assay; Yiwu Aozuo Trading Firm measured 99.91% across 1. Purity reflects the lots actually tested, not every batch either vendor sells.
Full profiles: Mei Peptide, Yiwu Aozuo Trading Firm.
Full lab-test records: All 8 Mei Peptide lab tests, All 2 Yiwu Aozuo Trading Firm lab tests.
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