Independent side-by-side comparison of Peptide Sciences and regenix-peptides.co — third-party lab grades, tested purity, COA availability, FDA warnings, and community ratings.
Bottom line: Peptide Sciences holds the stronger independent lab grade (C vs ungraded); regenix-peptides.co has more published third-party tests (1 vs 0); Peptide Sciences carries more community reviews (1247).
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.
Peptide Sciences has no independent Janoshik assays on file. regenix-peptides.co: 1 independent Janoshik assay, median measured purity 99.8%, most recent 2025-08-12.
| Attribute | Peptide Sciences | regenix-peptides.co |
|---|---|---|
| Independent lab grade | C | Not graded |
| Third-party tests | None published | 1 test, avg purity 99.8% |
| Community rating | 4.7/5 (1247 reviews) | No reviews |
| COA available | Yes | Yes |
| Endotoxin tested | No | No |
| FDA warnings | None on record | None on record |
| Year established | 1990 | Unknown |
| Substance | Peptide Sciences | regenix-peptides.co |
|---|---|---|
| Retatrutide 20mg | Not tested | 99.75% (1 assay, latest 2025-08-12) |
Regenix-peptides.co. Peptide Sciences has no independent Janoshik assays on file. regenix-peptides.co: 1 independent Janoshik assay, median measured purity 99.8%, most recent 2025-08-12. These are third-party Janoshik assays published against the vendor, not the vendor's own certificates.
Full profiles: Peptide Sciences, regenix-peptides.co.
Full lab-test records: All 1 regenix-peptides.co lab test.
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