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A Certificate of Analysis (COA) is a document describing the analytical results for a specific batch (LOT) of research material. Unlike scientific literature, which describes a molecule in general, a COA relates exclusively to the batch actually shipped.
Product and LOT
The first step when checking a COA is to make sure the document corresponds exactly to the batch being shipped. The LOT number listed on the COA must match the one on the product packaging.
HPLC and LC-MS Methods
Most COA documents include results obtained via HPLC (High-Performance Liquid Chromatography) and/or LC-MS (Liquid Chromatography-Mass Spectrometry) methods. HPLC typically provides purity data, while LC-MS helps confirm the identity of the molecule.
How HPLC Actually Measures Purity
An HPLC instrument forces a sample solution under high pressure through a column packed with material that slows different molecules at different rates, depending on their chemical properties. The result is a chromatogram - a graphical plot in which each component of the sample appears as a separate peak at a specific retention time. The purity percentage is calculated as the area under the target molecule's peak relative to the total area of all peaks on the chromatogram - the closer that share is to 100%, the fewer impurities or synthesis byproducts are present.
What a Typical COA Report Looks Like
A standard COA usually contains several key elements: the product name and LOT number, the date of analysis and the laboratory name, the measured purity expressed as a percentage, confirmation of molecular mass via LC-MS analysis, and sometimes data on residual moisture or solvent presence. Understanding these elements allows researchers to quickly assess whether a document is complete and relevant to the specific batch.
Laboratory and Date of Analysis
It's important to check which laboratory performed the analysis and when. Older analysis results may be less relevant if significant time has passed between batch production and delivery.
Scope and Limitations of a COA
A COA by itself does not prove the sterility of a material, nor its suitability for any use beyond lawful in vitro laboratory purposes. It is solely an analytical document confirming the material's purity and identity.
Where to Find a COA for Peptiva Products
For products such as Retatrutide, BPC-157, or GHK-Cu, available documentation can be requested before ordering via the contact page.
The content of this article is intended for general educational purposes and does not constitute medical advice or a recommendation for use in humans or animals.