Independent side-by-side comparison of Zhuoyan Peptides and ZLZ Peptide — third-party lab grades, tested purity, COA availability, FDA warnings, and community ratings.
Bottom line: ZLZ Peptide holds the stronger independent lab grade (ungraded vs C); Zhuoyan Peptides shows higher average tested purity (99.7% vs 99.2%); ZLZ Peptide has more published third-party tests (9 vs 4).
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.
Zhuoyan Peptides: 4 independent Janoshik assays, across 4 substances, median measured purity 99.7%, most recent 2026-03-24. ZLZ Peptide: 9 independent Janoshik assays, across 9 substances, median measured purity 99.7%, most recent 2025-11-20.
| Attribute | Zhuoyan Peptides | ZLZ Peptide |
|---|---|---|
| Independent lab grade | Not graded | C |
| Third-party tests | 4 tests, avg purity 99.7% | 9 tests, avg purity 99.2% |
| COA available | No | No |
| Endotoxin tested | No | No |
| FDA warnings | None on record | None on record |
| Substance | Zhuoyan Peptides | ZLZ Peptide |
|---|---|---|
| Bb10(bpc 5mg + TB 5mg) | purity not reported (1 assay, latest 2026-03-24) | Not tested |
| Ss-31 10mg | 99.69% (1 assay, latest 2025-06-16) | Not tested |
| Epitalon 10mg | 99.54% (1 assay, latest 2025-06-16) | Not tested |
| Tirzepatide 10mg | 99.80% (1 assay, latest 2025-03-06) | Not tested |
| Selank 10mg | Not tested | 99.37% (1 assay, latest 2025-11-20) |
| Igf-1 Lr3 1mg | Not tested | 96.27% (1 assay, latest 2025-11-20) |
| Cp10 (cjc-1295 Without DAC 5mg + Ipamorelin 5mg) | Not tested | purity not reported (1 assay, latest 2025-11-20) |
| Tirzepatide 120mg | Not tested | 99.93% (1 assay, latest 2025-11-20) |
| Nad+ 500mg | Not tested | purity not reported (1 assay, latest 2025-11-20) |
| Mots-c 10mg | Not tested | 99.63% (1 assay, latest 2025-06-16) |
| Retatrutide 10mg | Not tested | 99.69% (1 assay, latest 2025-03-06) |
| Tirzepatide 30mg | Not tested | 99.84% (1 assay, latest 2025-03-06) |
| Checked | Zhuoyan Peptides | ZLZ Peptide |
|---|---|---|
| Certificates of analysis | None found on the site | Not stated |
| Products listed | 20 | Not stated |
| Ships to | Worldwide | Not stated |
| Stated origin | China | Not stated |
ZLZ Peptide. Zhuoyan Peptides: 4 independent Janoshik assays, across 4 substances, median measured purity 99.7%, most recent 2026-03-24. ZLZ Peptide: 9 independent Janoshik assays, across 9 substances, median measured purity 99.7%, most recent 2025-11-20. These are third-party Janoshik assays published against the vendor, not the vendor's own certificates.
We found no certificates of analysis anywhere on Zhuoyan Peptides' site, and we have not read ZLZ Peptide's site. A published COA is the vendor's own document; the assay figures elsewhere on this page are independent of it.
Zhuoyan Peptides states it ships to Worldwide, and ZLZ Peptide does not state one. Both are read from the vendors' own sites.
Full profiles: Zhuoyan Peptides, ZLZ Peptide.
Full lab-test records: All 4 Zhuoyan Peptides lab tests, All 9 ZLZ Peptide lab tests.
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