Independent side-by-side comparison of Fenrir Labs Uk LTD and Penguin Peptides — third-party lab grades, tested purity, COA availability, FDA warnings, and community ratings.
Bottom line: Fenrir Labs Uk LTD shows higher average tested purity (99.7% vs 99.2%); Penguin Peptides has more published third-party tests (18 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. Penguin Peptides: 18 independent Janoshik assays, across 17 substances, median measured purity 99.8%, most recent 2026-01-22.
| Attribute | Fenrir Labs Uk LTD | Penguin Peptides |
|---|---|---|
| Third-party tests | 1 test, avg purity 99.7% | 18 tests, avg purity 99.2% |
| COA available | Yes | No |
| Endotoxin tested | No | No |
| FDA warnings | None on record | None on record |
| Substance | Fenrir Labs Uk LTD | Penguin Peptides |
|---|---|---|
| GLOW 70mg | Not tested | purity not reported (2 assays, latest 2026-01-21) |
| Retatrutide 10 Mg | 99.75% (1 assay, latest 2025-07-07) | Not tested |
| HGH 191AA 36iu | Not tested | 96.33% (1 assay, latest 2026-01-22) |
| Glp-1 T 120mg | Not tested | 99.88% (1 assay, latest 2026-01-21) |
| Glp-1 T 60mg | Not tested | 99.86% (1 assay, latest 2026-01-21) |
| Glp-3 R 30mg | Not tested | 99.88% (1 assay, latest 2026-01-21) |
| KLOW 80mg | Not tested | purity not reported (1 assay, latest 2026-01-21) |
| Mots-c 40mg | Not tested | 99.54% (1 assay, latest 2026-01-21) |
| BACTERIOSTATIC WATER 10ml | Not tested | purity not reported (1 assay, latest 2026-01-21) |
| Bpc-157 10mg + TB 500 10mg | Not tested | purity not reported (1 assay, latest 2026-01-21) |
| Ghk-cu 50mg | Not tested | 99.97% (1 assay, latest 2025-08-25) |
| Epithalon 10mg | Not tested | 99.76% (1 assay, latest 2025-08-21) |
| Checked | Fenrir Labs Uk LTD | Penguin Peptides |
|---|---|---|
| Certificates of analysis | None found on the site | Not stated |
| Products listed | 11 | Not stated |
| Public pricing | Listed on the site | Not stated |
| Payment methods | Bank Transfer | Not stated |
| Ships to | United Kingdom | Not stated |
| Research-use-only notice | Published | Not stated |
Penguin Peptides. Fenrir Labs Uk LTD: 1 independent Janoshik assay, median measured purity 99.7%, most recent 2025-07-07. Penguin Peptides: 18 independent Janoshik assays, across 17 substances, median measured purity 99.8%, most recent 2026-01-22. 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 have not read Penguin Peptides' 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 Penguin Peptides does not state one. Both are read from the vendors' own sites.
Full profiles: Fenrir Labs Uk LTD, Penguin Peptides.
Full lab-test records: All 1 Fenrir Labs Uk LTD lab test, All 18 Penguin Peptides lab tests.
Related comparisons: Fenrir Labs Uk LTD vs InfiniWell, Penguin Peptides vs Apex Peptides, Fenrir Labs Uk LTD vs Reta-Peptide, Penguin Peptides vs Certified Peptides, Penguin Peptides vs Limitless Life Nootropics, Penguin Peptides vs Mei Peptide.