Independent side-by-side comparison of Certified Peptides and Mei Peptide — third-party lab grades, tested purity, COA availability, FDA warnings, and community ratings.
Bottom line: Certified Peptides shows higher average tested purity (99.3% vs 99.2%); Mei Peptide has more published third-party tests (8 vs 4).
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.
Certified Peptides: 4 independent Janoshik assays, across 4 substances, median measured purity 99.7%, most recent 2026-04-01. Mei Peptide: 8 independent Janoshik assays, across 8 substances, median measured purity 99.1%, most recent 2025-11-20.
| Attribute | Certified Peptides | Mei Peptide |
|---|---|---|
| Third-party tests | 4 tests, avg purity 99.3% | 8 tests, avg purity 99.2% |
| COA available | No | No |
| Endotoxin tested | No | No |
| FDA warnings | None on record | None on record |
| Substance | Certified Peptides | Mei Peptide |
|---|---|---|
| Retatrutide 5mg | 99.70% (1 assay, latest 2026-04-01) | Not tested |
| Selank 10mg | 99.79% (1 assay, latest 2026-03-31) | Not tested |
| Epitalon 50mg | 98.00% (1 assay, latest 2026-03-31) | Not tested |
| Lpamorelin 10mg | 99.77% (1 assay, latest 2026-03-31) | Not tested |
| KLOW (ghk Or Ghk-cu/ Tb-500/ Bpc-157/ Kpv) | Not tested | purity not reported (1 assay, latest 2025-11-20) |
| Sermorelin | Not tested | 99.01% (1 assay, latest 2025-11-19) |
| Cjc-1295 With DAC 5 | Not tested | 98.28% (1 assay, latest 2025-11-19) |
| Tirzepatide 30mg | Not tested | 99.78% (1 assay, latest 2025-07-22) |
| Tesamorelin 10mg | Not tested | 99.08% (1 assay, latest 2025-07-19) |
| Retatrutide 10mg | Not tested | 99.66% (1 assay, latest 2025-07-19) |
| Nad+500 | Not tested | purity not reported (1 assay, latest 2025-07-18) |
| Bpc5mg+tb5mg Blend | Not tested | purity not reported (1 assay, latest 2025-07-18) |
Mei Peptide. Certified Peptides: 4 independent Janoshik assays, across 4 substances, median measured purity 99.7%, most recent 2026-04-01. Mei Peptide: 8 independent Janoshik assays, across 8 substances, median measured purity 99.1%, most recent 2025-11-20. These are third-party Janoshik assays published against the vendor, not the vendor's own certificates.
Full profiles: Certified Peptides, Mei Peptide.
Full lab-test records: All 4 Certified Peptides lab tests, All 8 Mei Peptide lab tests.
Related comparisons: Certified Peptides vs BioTech Peptides, Mei Peptide vs Ameano Peptides, Certified Peptides vs Penguin Peptides, Mei Peptide vs Cocer Peptides, Certified Peptides vs Qingfuji Trading, Mei Peptide vs Hangzhou Qihang Xingcheng.