Independent side-by-side comparison of Maximum Peps and PepSynth Labs — third-party lab grades, tested purity, COA availability, FDA warnings, and community ratings.
Bottom line: Maximum Peps has more published third-party tests (1 vs 0); PepSynth Labs carries more community reviews (120).
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.
Maximum Peps: 1 independent Janoshik assay, median measured purity 99.7%, most recent 2026-01-28. PepSynth Labs has no independent Janoshik assays on file.
| Attribute | Maximum Peps | PepSynth Labs |
|---|---|---|
| Third-party tests | 1 test, avg purity 99.7% | None published |
| Community rating | No reviews | 4/5 (120 reviews) |
| COA available | No | Yes |
| Endotoxin tested | No | No |
| FDA warnings | None on record | None on record |
| Production country | Not specified | United States |
| Year established | Unknown | 2022 |
| Substance | Maximum Peps | PepSynth Labs |
|---|---|---|
| Glp-3rt 20mg | 99.71% (1 assay, latest 2026-01-28) | Not tested |
| Checked | Maximum Peps | PepSynth Labs |
|---|---|---|
| Certificates of analysis | None found on the site | None found on the site |
| Products listed | 67 | 34 |
| Public pricing | Listed on the site | Listed on the site |
| Ships to | Not stated | United States, Worldwide |
| Carriers | Not stated | FedEx, USPS |
| Research-use-only notice | Published | Published |
| Stated origin | Not stated | United States |
Maximum Peps. Maximum Peps: 1 independent Janoshik assay, median measured purity 99.7%, most recent 2026-01-28. PepSynth Labs has no independent Janoshik assays on file. These are third-party Janoshik assays published against the vendor, not the vendor's own certificates.
We found no certificates of analysis anywhere on Maximum Peps' site, and we found no certificates of analysis anywhere on PepSynth Labs' site. A published COA is the vendor's own document; the assay figures elsewhere on this page are independent of it.
Maximum Peps does not state a shipping region, and PepSynth Labs states it ships to United States, Worldwide. Both are read from the vendors' own sites.
Full profiles: Maximum Peps, PepSynth Labs.
Full lab-test records: All 1 Maximum Peps lab test.
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