Independent side-by-side comparison of Apex 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); ZLZ Peptide has more published third-party tests (9 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.
Apex Peptides: 2 independent Janoshik assays, across 2 substances, median measured purity 99.2%, most recent 2026-02-04. ZLZ Peptide: 9 independent Janoshik assays, across 9 substances, median measured purity 99.7%, most recent 2025-11-20.
| Attribute | Apex Peptides | ZLZ Peptide |
|---|---|---|
| Independent lab grade | Not graded | C |
| Third-party tests | 2 tests, avg purity 99.2% | 9 tests, avg purity 99.2% |
| COA available | No | No |
| Endotoxin tested | No | No |
| FDA warnings | None on record | None on record |
| Substance | Apex Peptides | ZLZ Peptide |
|---|---|---|
| Retatrutide 40mg | 99.28% (1 assay, latest 2026-02-04) | Not tested |
| Retatrutide 20mg | 99.07% (1 assay, latest 2026-02-04) | 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) |
| Semaglutide 10mg | Not tested | 99.74% (1 assay, latest 2024-11-29) |
| Checked | Apex Peptides | ZLZ Peptide |
|---|---|---|
| Certificates of analysis | None found on the site | Not stated |
| Products listed | 29 | Not stated |
| Public pricing | Listed on the site | Not stated |
| Ships to | United States | Not stated |
| Research-use-only notice | Published | Not stated |
ZLZ Peptide. Apex Peptides: 2 independent Janoshik assays, across 2 substances, median measured purity 99.2%, most recent 2026-02-04. 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 Apex 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.
Apex Peptides states it ships to United States, and ZLZ Peptide does not state one. Both are read from the vendors' own sites.
Full profiles: Apex Peptides, ZLZ Peptide.
Full lab-test records: All 2 Apex Peptides lab tests, All 9 ZLZ Peptide lab tests.
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