Independent side-by-side comparison of Fenrir Labs Uk LTD and Reta-Peptide — third-party lab grades, tested purity, COA availability, FDA warnings, and community ratings.
Bottom line: Reta-Peptide holds the stronger independent lab grade (ungraded vs D); Fenrir Labs Uk LTD shows higher average tested purity (99.7% vs 99.5%); Reta-Peptide has more published third-party tests (19 vs 1).
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.
Fenrir Labs Uk LTD: 1 independent Janoshik assay, median measured purity 99.7%, most recent 2025-07-07. Reta-Peptide: 19 independent Janoshik assays, across 17 substances, median measured purity 99.6%, most recent 2025-11-20.
| Attribute | Fenrir Labs Uk LTD | Reta-Peptide |
|---|---|---|
| Independent lab grade | Not graded | D |
| Third-party tests | 1 test, avg purity 99.7% | 19 tests, avg purity 99.5% |
| COA available | Yes | No |
| Endotoxin tested | No | No |
| FDA warnings | None on record | None on record |
| Substance | Fenrir Labs Uk LTD | Reta-Peptide |
|---|---|---|
| Tesamorelin | Not tested | 99.34% (2 assays, latest 2025-11-19) |
| Tirzepatide 60mg | Not tested | 99.83% (2 assays, latest 2025-04-18) |
| Retatrutide 10 Mg | 99.75% (1 assay, latest 2025-07-07) | Not tested |
| KLOW (ghk Or Ghk-cu/ Tb-500/ Bpc-157/ Kpv) | Not tested | purity not reported (1 assay, latest 2025-11-20) |
| Bpc-157/tb-500 Blend | Not tested | purity not reported (1 assay, latest 2025-11-20) |
| Cjc-1295 With DAC 5 | Not tested | 98.28% (1 assay, latest 2025-11-19) |
| Cagrilintide | Not tested | 99.34% (1 assay, latest 2025-11-19) |
| Semaglutide | Not tested | 99.62% (1 assay, latest 2025-11-19) |
| Retatrutide | Not tested | 99.48% (1 assay, latest 2025-11-19) |
| Tirzepatide | Not tested | 99.86% (1 assay, latest 2025-11-19) |
| Tirzepatide 30mg | Not tested | 99.78% (1 assay, latest 2025-07-22) |
| Tesamorelin 10mg | Not tested | 99.08% (1 assay, latest 2025-07-19) |
| Checked | Fenrir Labs Uk LTD | Reta-Peptide |
|---|---|---|
| Certificates of analysis | None found on the site | None found on the site |
| Products listed | 11 | 35 |
| Public pricing | Listed on the site | Listed on the site |
| Payment methods | Bank Transfer | Cryptocurrency, Bank Transfer |
| Ships to | United Kingdom | United States, United Kingdom, Canada, Australia, New Zealand |
| Carriers | Not stated | DHL, FedEx, UPS, USPS |
| Research-use-only notice | Published | Not stated |
| Stated origin | Not stated | China |
Reta-Peptide. Fenrir Labs Uk LTD: 1 independent Janoshik assay, median measured purity 99.7%, most recent 2025-07-07. Reta-Peptide: 19 independent Janoshik assays, across 17 substances, median measured purity 99.6%, 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 Fenrir Labs Uk LTD's site, and we found no certificates of analysis anywhere on Reta-Peptide's site. A published COA is the vendor's own document; the assay figures elsewhere on this page are independent of it.
Fenrir Labs Uk LTD states it ships to United Kingdom, and Reta-Peptide states it ships to United States, United Kingdom, Canada, Australia, New Zealand. Both are read from the vendors' own sites.
Full profiles: Fenrir Labs Uk LTD, Reta-Peptide.
Full lab-test records: All 1 Fenrir Labs Uk LTD lab test, All 19 Reta-Peptide lab tests.
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