How to Read a Certificate of Analysis (COA) for Research Peptides

A certificate of analysis, or COA, is the document that shows what a batch of research material actually contains. Reading one correctly takes a few minutes and tells you more about a supplier than any product page can.

Key takeaways

• A COA should be tied to a specific lot number, not just a product name.
• Purity (HPLC) and identity (mass spectrometry) answer two different questions.
• Test date, lab name and method should all be visible.
• Match the lot on the vial to the lot on the report.

What a COA is

A COA is a report from a laboratory that tested a sample from one production batch. It lists the compound, the lot number, the tests run and the results. A genuine report comes from a testing lab, and ideally a third party, rather than a template filled in by the seller.

The fields to check, one by one

• Compound name and lot or batch number. The lot number is what links the report to the vial in your hands.
• Test date. Old reports for new lots are a warning sign.
• Purity by HPLC. Shown as a percentage of the main peak. Higher is better, but see the next point.
• Identity by mass spectrometry. The measured molecular weight should match the expected weight of the peptide.
• Laboratory name and method. You should be able to tell who ran the test and how.

Purity is not the same as quantity

HPLC purity tells you what fraction of the peptide material is the intended peptide. It does not by itself tell you how many milligrams are in the vial. Some reports also show measured content. If a vial is labeled with an amount, check whether the report supports that number.

Red flags

• No lot number, or a lot number that does not match the vial.
• A report with no lab name, logo or contact details.
• Identical-looking results across different compounds.
• A chromatogram that has been cropped or has no axes.

How Lucid Aminos presents COAs

Every product page links to the available report, and all of them are collected on the COA page. Bundles show the report for each compound inside them.

Frequently asked questions

What purity should a research peptide have?

Many research suppliers aim for 98 percent or higher by HPLC. The right threshold depends on your experiment, so decide it before you order.

Is HPLC enough on its own?

No. HPLC shows purity, while mass spectrometry confirms that the main peak is the right molecule. A good COA includes both.

Can I request a report for my specific lot?

Yes. Ask the supplier for the report that matches the lot printed on your vial.

Handling and documentation

Keep the COA with your lab records, noting the lot number alongside each experiment. If a result ever looks unexpected, the lot-level record is the first place to check. Browse the full research compound catalog to see the report linked on each product.

For research use only. Lucid Aminos compounds are sold for laboratory and scientific research. They are not for human or veterinary use, and nothing here is medical advice or a claim that any compound treats, cures or prevents any condition.