Finnrick, an independent testing programme, publishes 132 assays for Peptide Sciences: 79 met its Purity focus threshold (at least 99.5% purity, no more than 35% dosage deviation) and 53 did not. Most recent assay 20 Jul 2026.
Peptide Sciences operates from US: NV 89052, listed by Finnrick as "Trading". Source: Finnrick, https://www.finnrick.com/vendors/peptide-sciences.
Formerly one of the longest-running US-based peptide research suppliers, founded 1990 in Henderson, NV. Consumer e-commerce site launched circa 2012. Shut down March 6, 2026.
Peptide Sciences is recorded as closed. Shut down March 2026. Prior to closure, independent testing revealed purity as low as 75% despite claims of pharmaceutical-grade quality.
Peptide Sciences holds independent lab grade C, assigned across 128 graded samples, average score 6.7/10. That grade comes from an independent grader's own sampling, not from PeptideAtlas, and it describes the samples that grader obtained rather than every batch sold.
Community standing: 4.7/5 from 1247 community reviews. Ratings of anonymous sellers of unregulated products are the weakest signal on this page; the assay and grading records carry more.
No independent third-party assay is on file for Peptide Sciences, and we have not yet compiled a profile of its own website. An untested vendor has not failed a test — this is an absence of evidence, not evidence against it.
| Product | Assays | Result |
|---|---|---|
| Retatrutide | 41 | 21 passed, 20 failed |
| Tirzepatide | 17 | 10 passed, 7 failed |
| Semaglutide | 15 | 13 passed, 2 failed |
| BPC-157 | 13 | 9 passed, 4 failed |
| CJC-1295 | 11 | 1 passed, 10 failed |
| Melanotan II | 10 | 5 passed, 5 failed |
| Ipamorelin | 9 | 8 passed, 1 failed |
| GHK-Cu | 6 | 6 passed, 0 failed |
| PT-141 | 6 | 6 passed, 0 failed |
| Tesamorelin | 4 | 0 passed, 4 failed |
Source: Finnrick, as published 2026-08-09. Pass and fail are Finnrick's classification against its own threshold, not ours.
| Status | Closed |
|---|---|
| Independent lab grade | C (128 samples) |
| Average grader score | 6.7/10 |
| Community rating | 4.7/5 from 1247 reviews |
| Year established | 1990 |
| Payment methods | Credit Card, Cryptocurrency, Wire Transfer |
| Last tested | 2026-03-15 |
Peptide Sciences is no longer operating, so there is nothing to buy from it today.
Yes. Finnrick, an independent testing programme, publishes 132 assays for Peptide Sciences: 79 met its Purity focus threshold (at least 99.5% purity, no more than 35% dosage deviation) and 53 did not. Most recent assay 20 Jul 2026.
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Popular peptides: Semaglutide, Tirzepatide, Retatrutide, BPC-157, CJC-1295, Ipamorelin.
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