Independent side-by-side comparison of Peptide Sciences and Purity Peptides — 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); 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.
| Attribute | Peptide Sciences | Purity Peptides |
|---|---|---|
| Independent lab grade | C | Not graded |
| Community rating | 4.7/5 (1247 reviews) | 4.5/5 (210 reviews) |
| COA available | Yes | Yes |
| Endotoxin tested | No | No |
| FDA warnings | None on record | None on record |
| Production country | Not specified | North America |
| Year established | 1990 | 2022 |
| Checked | Peptide Sciences | Purity Peptides |
|---|---|---|
| Certificates of analysis | Not stated | 54 published on the site |
| Ships to | Not stated | United States, Canada, Worldwide |
| Research-use-only notice | Not stated | Published |
Peptide Sciences states that COAs are available, and Purity Peptides publishes 54 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.
Peptide Sciences does not state a shipping region, and Purity Peptides states it ships to United States, Canada, Worldwide. Both are read from the vendors' own sites.
Full profiles: Peptide Sciences, Purity Peptides.
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