Independent side-by-side comparison of HK Peptides and SSR Bio — third-party lab grades, tested purity, COA availability, FDA warnings, and community ratings.
Bottom line: HK Peptides holds the stronger independent lab grade (C vs ungraded); SSR Bio shows higher average tested purity (99.9% vs 98.7%); HK Peptides has more published third-party tests (5 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.
HK Peptides: 5 independent Janoshik assays, across 5 substances, median measured purity 99.7%, most recent 2025-11-03. SSR Bio: 1 independent Janoshik assay, median measured purity 99.9%, most recent 2026-04-15.
| Attribute | HK Peptides | SSR Bio |
|---|---|---|
| Independent lab grade | C | Not graded |
| Third-party tests | 5 tests, avg purity 98.7% | 1 test, avg purity 99.9% |
| COA available | No | Yes |
| Endotoxin tested | No | No |
| FDA warnings | None on record | None on record |
| Substance | HK Peptides | SSR Bio |
|---|---|---|
| Tirzepatide 30mg | 99.70% (1 assay, latest 2024-09-30) | 99.89% (1 assay, latest 2026-04-15) |
| HGH 24 IU | 95.42% (1 assay, latest 2025-11-03) | Not tested |
| KPV 10mg | 99.79% (1 assay, latest 2025-04-09) | Not tested |
| Tirzepatide 10mg | 99.70% (1 assay, latest 2024-09-30) | Not tested |
| Nad+ 500mg | purity not reported (1 assay, latest 2024-09-26) | Not tested |
| Checked | HK Peptides | SSR Bio |
|---|---|---|
| Certificates of analysis | None found on the site | 28 published on the site |
| Products listed | 15 | 58 |
| Payment methods | Not stated | Cryptocurrency, Bank Transfer |
| Ships to | United States, Europe, Worldwide | United States, United Kingdom, Europe, Australia, Worldwide |
| Carriers | Not stated | DHL, FedEx |
| Stated origin | China | China |
HK Peptides. HK Peptides: 5 independent Janoshik assays, across 5 substances, median measured purity 99.7%, most recent 2025-11-03. SSR Bio: 1 independent Janoshik assay, median measured purity 99.9%, most recent 2026-04-15. These are third-party Janoshik assays published against the vendor, not the vendor's own certificates.
Tirzepatide 30mg has been independently assayed for both. HK Peptides measured a median 99.70% across 1 assay; SSR Bio measured 99.89% across 1. Purity reflects the lots actually tested, not every batch either vendor sells.
We found no certificates of analysis anywhere on HK Peptides' site, and SSR Bio publishes 28 certificates of analysis on its own site. A published COA is the vendor's own document; the assay figures elsewhere on this page are independent of it.
HK Peptides states it ships to United States, Europe, Worldwide, and SSR Bio states it ships to United States, United Kingdom, Europe, Australia, Worldwide. Both are read from the vendors' own sites.
Full profiles: HK Peptides, SSR Bio.
Full lab-test records: All 5 HK Peptides lab tests, All 1 SSR Bio lab test.
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