Independent side-by-side comparison of Apex Peptides and Guruite Biotechnology Co-Greatpeptide — third-party lab grades, tested purity, COA availability, FDA warnings, and community ratings.
Bottom line: Guruite Biotechnology Co-Greatpeptide shows higher average tested purity (99.8% vs 99.2%); Guruite Biotechnology Co-Greatpeptide has more published third-party tests (4 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. Guruite Biotechnology Co-Greatpeptide: 4 independent Janoshik assays, across 4 substances, median measured purity 99.8%, most recent 2024-05-31.
| Attribute | Apex Peptides | Guruite Biotechnology Co-Greatpeptide |
|---|---|---|
| Third-party tests | 2 tests, avg purity 99.2% | 4 tests, avg purity 99.8% |
| COA available | No | Yes |
| Endotoxin tested | No | No |
| FDA warnings | None on record | None on record |
| Substance | Apex Peptides | Guruite Biotechnology Co-Greatpeptide |
|---|---|---|
| Retatrutide 40mg | 99.28% (1 assay, latest 2026-02-04) | Not tested |
| Retatrutide 20mg | 99.07% (1 assay, latest 2026-02-04) | Not tested |
| Reta 10mg Green Top | Not tested | 99.78% (1 assay, latest 2024-05-31) |
| Epitalon 10 Mg | Not tested | 99.88% (1 assay, latest 2024-05-29) |
| Mazdutide 10 Mg | Not tested | 99.72% (1 assay, latest 2024-05-29) |
| Tirzepatide 10MG Red Top | Not tested | 99.80% (1 assay, latest 2024-04-05) |
| Checked | Apex Peptides | Guruite Biotechnology Co-Greatpeptide |
|---|---|---|
| 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 |
Guruite Biotechnology Co-Greatpeptide. Apex Peptides: 2 independent Janoshik assays, across 2 substances, median measured purity 99.2%, most recent 2026-02-04. Guruite Biotechnology Co-Greatpeptide: 4 independent Janoshik assays, across 4 substances, median measured purity 99.8%, most recent 2024-05-31. These are third-party Janoshik assays published against the vendor, not the vendor's own…
We found no certificates of analysis anywhere on Apex Peptides' site, and Guruite Biotechnology Co-Greatpeptide states that COAs are available. 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 Guruite Biotechnology Co-Greatpeptide does not state one. Both are read from the vendors' own sites.
Full profiles: Apex Peptides, Guruite Biotechnology Co-Greatpeptide.
Full lab-test records: All 2 Apex Peptides lab tests, All 4 Guruite Biotechnology Co-Greatpeptide lab tests.
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