What Is a COA? Understanding Third-Party Peptide Testing

Published by Proliven Labs — For Research Use Only

In peptide research, the integrity of your compound determines the reliability of your results. That's why serious researchers rely on Certificates of Analysis (COAs) — independent laboratory reports that confirm the identity and purity of a given peptide batch.

At Proliven Labs, every peptide we manufacture is third-party tested by ISO-accredited analytical labs. This ensures that our customers receive compounds that meet or exceed 99% purity, with validated identity through methods like mass spectrometry and HPLC.

A COA is a lab-generated document that includes:

• Peptide name and batch number
• Purity percentage (e.g., 99.5%)
• Testing methods used (e.g., HPLC, MS, NMR)
• Identity confirmation via molecular weight or sequence analysis
• Storage & stability recommendations

Many manufacturers perform in-house testing — but this creates a conflict of interest. At Proliven Labs, we believe trust starts with transparency. Our COAs are issued by third-party labs that have no financial ties to us. These labs are equipped with advanced instrumentation and follow rigorous validation protocols.

Our COAs are batch-specific, meaning you can verify exactly what’s in your vial — no guesswork, no marketing fluff.

• Purity: 99.5% by HPLC
• Molecular Weight: Confirmed by mass spectrometry
• Appearance: White lyophilized powder
• Storage: -20°C recommended
• Form: Acetate salt, sterile-filtered

Every vial from Proliven Labs includes a lot number. You can use this number to request or access the COA specific to your product. We are also working on a COA Lookup feature to make this process faster for researchers.

All peptides offered by Proliven Labs are strictly for laboratory research use. Our commitment to third-party testing is designed to support responsible science — not unverified or off-label use.

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