3 independent third-party assays of Igf-1 Lr3 1mg, covering 3 vendors.
Measured purity across those assays runs from 96.3% to 99.6%, median 98.1%. The spread is the point: it is variation between lots and between vendors, not a single number that describes the compound.
Assay dates span 2025-08-29 to 2026-03-09.
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 |
|---|---|---|---|
| Cocer Peptides | 1 | 99.6% | 2025-08-29 |
| Panda Peptides LLC | 1 | 98.1% | 2026-03-09 |
| ZLZ Peptide | 1 | 96.3% | 2025-11-20 |
Vendors assayed: Cocer Peptides, Panda Peptides LLC, ZLZ Peptide.