Independent side-by-side comparison of Peptide Gurus and Peptide-S — third-party lab grades, tested purity, COA availability, FDA warnings, and community ratings.
Bottom line: Peptide-S holds the stronger independent lab grade (D vs C); Peptide Gurus has more published third-party tests (63 vs 0).
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. Peptide-S has no independent Janoshik assays on file.
| Attribute | Peptide Gurus | Peptide-S |
|---|---|---|
| Independent lab grade | D | C |
| Third-party tests | 63 tests, avg purity 99.5% | None published |
| COA available | No | No |
| Endotoxin tested | No | No |
| FDA warnings | None on record | None on record |
| Substance | Peptide Gurus | Peptide-S |
|---|---|---|
| Retatrutide 10mg | 99.51% (3 assays, latest 2026-04-14) | Not tested |
| Tirzepatide 30mg | 99.84% (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 |
| Checked | Peptide Gurus | Peptide-S |
|---|---|---|
| Certificates of analysis | Not stated | None found on the site |
| Products listed | Not stated | 186 |
| Public pricing | Not stated | Listed on the site |
| Ships to | Not stated | United States, Worldwide |
| Carriers | Not stated | UPS, USPS |
| Research-use-only notice | Not stated | Published |
Peptide Gurus. Peptide Gurus: 63 independent Janoshik assays, across 58 substances, median measured purity 99.7%, most recent 2026-04-24. Peptide-S has no independent Janoshik assays on file. These are third-party Janoshik assays published against the vendor, not the vendor's own certificates.
We have not read Peptide Gurus' site, and we found no certificates of analysis anywhere on Peptide-S' site. A published COA is the vendor's own document; the assay figures elsewhere on this page are independent of it.
Peptide Gurus does not state a shipping region, and Peptide-S states it ships to United States, Worldwide. Both are read from the vendors' own sites.
Full profiles: Peptide Gurus, Peptide-S.
Full lab-test records: All 63 Peptide Gurus lab tests.
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