Third-party lab testing: 9 independent Janoshik assays on file, covering 9 substances, median measured purity 99.7%, most recent test 2025-11-20.
Finnrick, an independent testing programme, publishes 274 assays for ZLZ Peptide: 220 met its Purity focus threshold (at least 99.5% purity, no more than 35% dosage deviation) and 53 did not. Most recent assay 5 Aug 2026.
ZLZ Peptide operates from China, listed by Finnrick as "Trading". Source: Finnrick, https://www.finnrick.com/vendors/zlz-peptide.
Finnrick-tested with mixed results. Tested across 9 peptide products with 229 total samples.
ZLZ Peptide is listed as active. Finnrick Grade C. Finnrick avg score: 6.9/10 across 229 samples (9 products). Mixed quality — some products test well, others below average.
ZLZ Peptide holds independent lab grade C, assigned across 229 graded samples, average score 6.9/10. 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.
| Substance | Measured purity | Test date |
|---|---|---|
| Selank 10mg | 99.37% | 2025-11-20 |
| Igf-1 Lr3 1mg | 96.27% | 2025-11-20 |
| Tirzepatide 120mg | 99.93% | 2025-11-20 |
| Mots-c 10mg | 99.63% | 2025-06-16 |
| Retatrutide 10mg | 99.69% | 2025-03-06 |
| Tirzepatide 30mg | 99.84% | 2025-03-06 |
| Semaglutide 10mg | 99.74% | 2024-11-29 |
| Cp10 (cjc-1295 Without DAC 5mg + Ipamorelin 5mg) | not reported | 2025-11-20 |
| Nad+ 500mg | not reported | 2025-11-20 |
7 of these 9 assays report a measured purity figure. The other 2 confirm the substance was submitted and tested but carry no purity number on the certificate, which is not the same as a failed result.
| Product | Assays | Result |
|---|---|---|
| Retatrutide | 102 | 92 passed, 9 failed |
| Tirzepatide | 93 | 80 passed, 13 failed |
| GHK-Cu | 17 | 14 passed, 3 failed |
| Tesamorelin | 16 | 5 passed, 11 failed |
| BPC-157 | 13 | 6 passed, 7 failed |
| Semaglutide | 11 | 8 passed, 3 failed |
| Ipamorelin | 6 | 5 passed, 1 failed |
| TB-500 | 6 | 2 passed, 4 failed |
| CJC-1295 | 5 | 4 passed, 1 failed |
| Sermorelin | 5 | 4 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 | C (229 samples) |
| Average grader score | 6.9/10 |
| Independent assays on file | 9 |
| Median measured purity | 99.7% |
| Vendor type | Research-use supplier |
ZLZ Peptide is listed as active and we hold 9 independent Janoshik assays on file, median measured purity 99.7%; 274 Finnrick assays (220 passing, 53 failing its purity threshold); an independent lab grade of C. That is evidence about the batches that were tested or published, not a guarantee about the vial you receive.
Yes. We hold 9 third-party Janoshik assays for ZLZ Peptide, covering 9 substances, with a median measured purity of 99.7%. The most recent is dated 2025-11-20. Finnrick, an independent testing programme, publishes 274 assays for ZLZ Peptide: 220 met its Purity focus threshold (at least 99.5% purity, no more than 35% dosage deviation) and 53 did not. Most recent assay 5 Aug 2026.
Tested substances: Selank 10mg, Igf-1 Lr3 1mg, Nad+ 500mg, Mots-c 10mg, Retatrutide 10mg, Tirzepatide 30mg, Semaglutide 10mg.
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