Every lot is independently tested before it ships. We publish the full certificate of analysis for every batch — not a summary, the actual document.
We run a comprehensive six-assay panel on every lot we carry. Most research peptide suppliers run one or two assays — we run five, covering purity, identity, and three safety screens.
High-performance liquid chromatography measures the percentage of the target compound present in the vial. Our in-stock products meet a minimum purity threshold before they are offered for sale.
Identity confirmation by mass spectrometry verifies that the compound in the vial matches the labeled peptide — not a structurally similar compound or substitution.
Inductively coupled plasma mass spectrometry screens for elemental impurities including lead, arsenic, mercury, cadmium, and other heavy metals that may be introduced during synthesis or handling.
Bacterial endotoxin testing per USP <85> confirms that the lot meets acceptable endotoxin limits for research-grade material. Endotoxin contamination is a common failure point not tested by most suppliers.
Polymerase chain reaction testing confirms the absence of microbial contamination — bacteria, yeast, and mold — in each lot prior to release.
The certificate of analysis for every in-stock lot is available directly on our product pages. Click View COA on any product card to open the full document for that exact batch. Your shipment includes a printed copy of the COA for your lot.
View the catalog →Most research peptide suppliers publish a single HPLC purity number — sometimes from an in-house instrument, sometimes from a third-party lab with no disclosed accreditation. A purity number tells you one thing: the percentage of your target compound. It tells you nothing about what else is in the vial.
Our panel adds four additional screens: identity (is it actually what it says it is?), heavy metals (are there elemental contaminants from synthesis?), endotoxin (are there bacterial byproducts that could compromise research?), and sterility (is there microbial contamination?). These are the questions a complete COA answers.
We publish the full document — not a summary — so you can read every result, every value, and every reference range for yourself.