Independent side-by-side comparison of PeptideCritic.com Best Sources Available and Polaris Peptides — third-party lab grades, tested purity, COA availability, FDA warnings, and community ratings.
Bottom line: Polaris Peptides holds the stronger independent lab grade (ungraded vs C); Polaris Peptides shows higher average tested purity (99.7% vs 99.2%); Polaris Peptides has more published third-party tests (34 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.
PeptideCritic.com Best Sources Available: 2 independent Janoshik assays, across 2 substances, median measured purity 99.2%, most recent 2026-01-08. Polaris Peptides: 34 independent Janoshik assays, across 22 substances, median measured purity 99.8%, most recent 2026-02-11.
| Attribute | PeptideCritic.com Best Sources Available | Polaris Peptides |
|---|---|---|
| Independent lab grade | Not graded | C |
| Third-party tests | 2 tests, avg purity 99.2% | 34 tests, avg purity 99.7% |
| COA available | Yes | No |
| Endotoxin tested | No | No |
| FDA warnings | None on record | None on record |
| Substance | PeptideCritic.com Best Sources Available | Polaris Peptides |
|---|---|---|
| Retatrutide | Not tested | 99.71% (10 assays, latest 2025-06-05) |
| Semaglutide | Not tested | 99.07% (4 assays, latest 2024-08-16) |
| NAD 500 Mg | purity not reported (1 assay, latest 2026-01-08) | Not tested |
| Tirzepatide 30mg | 99.21% (1 assay, latest 2026-01-08) | Not tested |
| GLOW | Not tested | purity not reported (1 assay, latest 2026-02-11) |
| Thymulin | Not tested | 99.97% (1 assay, latest 2024-12-16) |
| Pt-141 | Not tested | 99.82% (1 assay, latest 2024-11-11) |
| Foxo4-dri | Not tested | 99.34% (1 assay, latest 2024-11-07) |
| Survodutide | Not tested | 99.88% (1 assay, latest 2024-09-24) |
| Cjc-1295 (without Dac) /ipamorelin Blend | Not tested | purity not reported (1 assay, latest 2024-06-26) |
| PE 22-28 | Not tested | 99.49% (1 assay, latest 2024-06-24) |
| N-acetyl Semax Amidate | Not tested | purity not reported (1 assay, latest 2024-06-14) |
| Checked | PeptideCritic.com Best Sources Available | Polaris Peptides |
|---|---|---|
| Certificates of analysis | Not stated | None found on the site |
| Products listed | Not stated | 62 |
| Public pricing | Not stated | Listed on the site |
| Payment methods | Not stated | Credit Card, Venmo |
| Research-use-only notice | Not stated | Published |
Polaris Peptides. PeptideCritic.com Best Sources Available: 2 independent Janoshik assays, across 2 substances, median measured purity 99.2%, most recent 2026-01-08. Polaris Peptides: 34 independent Janoshik assays, across 22 substances, median measured purity 99.8%, most recent 2026-02-11. These are third-party Janoshik assays published against the vendor, not the vendor's own certificates.
PeptideCritic.com Best Sources Available states that COAs are available, and we found no certificates of analysis anywhere on Polaris Peptides' site. A published COA is the vendor's own document; the assay figures elsewhere on this page are independent of it.
Full profiles: PeptideCritic.com Best Sources Available, Polaris Peptides.
Full lab-test records: All 2 PeptideCritic.com Best Sources Available lab tests, All 34 Polaris Peptides lab tests.
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