Finnrick, an independent testing programme, publishes 71 assays for PeptiSlim: 59 met its Purity focus threshold (at least 99.5% purity, no more than 35% dosage deviation) and 12 did not. Most recent assay 21 Jul 2026.
PeptiSlim operates from Us, listed by Finnrick as "Trading". Source: Finnrick, https://www.finnrick.com/vendors/peptislim.
Finnrick-tested with poor results. Tested across 4 peptide products with 45 total samples.
PeptiSlim is listed as active. Finnrick Grade D. Finnrick avg score: 7.8/10 across 45 samples (4 products). Below-average quality. Exercise caution.
PeptiSlim holds independent lab grade D, assigned across 45 graded samples, average score 7.8/10. 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.
| Product | Assays | Result |
|---|---|---|
| Tirzepatide | 29 | 26 passed, 3 failed |
| Retatrutide | 26 | 23 passed, 3 failed |
| GHK-Cu | 6 | 5 passed, 1 failed |
| Semaglutide | 4 | 3 passed, 1 failed |
| Tesamorelin | 4 | 1 passed, 3 failed |
| Cagrilintide | 2 | 1 passed, 1 failed |
Source: Finnrick, as published 2026-08-09. Pass and fail are Finnrick's classification against its own threshold, not ours.
| Status | Active |
|---|---|
| Independent lab grade | D (45 samples) |
| Average grader score | 7.8/10 |
| Vendor type | Research-use supplier |
These details were read from PeptiSlim's own website on 2026-08-10. Pages consulted:
PeptiSlim is listed as active and we hold 71 Finnrick assays (59 passing, 12 failing its purity threshold); an independent lab grade of D. That is evidence about the batches that were tested or published, not a guarantee about the vial you receive.
Yes. Finnrick, an independent testing programme, publishes 71 assays for PeptiSlim: 59 met its Purity focus threshold (at least 99.5% purity, no more than 35% dosage deviation) and 12 did not. Most recent assay 21 Jul 2026.
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