12 independent third-party assays of Epithalon 10mg, covering 9 vendors.
Measured purity across those assays runs from 99.1% to 100.0%, median 99.6%. The spread is the point: it is variation between lots and between vendors, not a single number that describes the compound.
Assay dates span 2024-04-15 to 2026-03-09.
Manufacturer recorded on the certificates: Cellpept Research, PACIFIC WAVE PEPTIDES, Penguin Peptides, Pacific Wave.
A certificate of analysis describes the lot that was submitted and nothing else. It is not a guarantee about a later batch, and purity is not identity — a sample can assay clean and still be the wrong compound, or the right compound at the wrong concentration. Vendors with no assay row below have not been tested here, which is not the same as having failed.
| Vendor | Assays | Median measured purity | Most recent |
|---|---|---|---|
| Pacific Wave | 1 | 100.0% | 2024-04-15 |
| Polaris Peptides | 1 | 99.9% | 2024-04-17 |
| Penguin Peptides | 1 | 99.8% | 2025-08-21 |
| Rayshine Peptide Biochemicals | 2 | 99.8% | 2025-09-18 |
| Qing Li Peptide | 1 | 99.6% | 2025-05-15 |
| PACIFIC WAVE PEPTIDES | 1 | 99.5% | 2025-08-26 |
| Panda Peptides LLC | 2 | 99.4% | 2026-03-09 |
| Cocer Peptides | 2 | 99.4% | 2026-01-07 |
| cellpept | 1 | 99.1% | 2025-11-14 |
Vendors assayed: Pacific Wave, Polaris Peptides, Penguin Peptides, Rayshine Peptide Biochemicals, Qing Li Peptide, PACIFIC WAVE PEPTIDES, Panda Peptides LLC, Cocer Peptides, cellpept.