Every batch, independently verified.
We don't grade our own work. Every lot is tested by Janoshik Analytic — the independent laboratory that set the standard for third-party peptide testing — and the result is published on a page anyone can read and verify.
Identity & purity
Reverse-phase HPLC quantifies purity; mass spectrometry confirms the molecular identity matches the expected mass. We target 99%+ HPLC purity and publish the exact figure for every batch.
Bacterial endotoxin
Endotoxin testing per United States Pharmacopeia chapter <85>, reported as conforming to the USP limit.
Heavy metals
Elemental impurity screening per USP guidance, reported as conforming.
Sterility
Sterility assessment per USP, reported as pass for applicable lots.
What every batch is tested for
Each batch is tested by an independent laboratory for identity and purity, bacterial endotoxin, heavy metals, and sterility, with the measured purity recorded for the currently shipping lot.
Purple Peptide is a supplier of research compounds for laboratory use only. We are not a compounding pharmacy under section 503A and not an outsourcing facility under section 503B.