What is a peptide COA (certificate of analysis)?

A peptide COA is a laboratory document describing what a specific batch was found to contain, typically identity and purity by HPLC, and sometimes heavy metals, endotoxins or sterility. It should name the product, the batch or lot, the analytical method and the laboratory that ran it.

Does PepLookup run or verify these peptide tests?

No. Every report listed here was produced by or for the supplier. We link to the supplier’s own document rather than rehosting it, so you read the original. We do not operate a laboratory, commission testing or certify any product.

What makes third-party peptide testing trustworthy?

Look for independent third-party testing rather than in-house QA, a lot number matching the vial, and a named method such as HPLC-UV or LC-MS. The report should include an actual chromatogram or spectrum, a recent date, and an identifiable lab or analyst.

Why do some suppliers have no lab report listed?

The supplier has not published a report we can open, or the link they published does not resolve to a certificate. We show “Report Pending” rather than implying a document exists. A missing COA is information worth weighing.

Does a COA guarantee the purity of the vial I receive?

No. A certificate describes one batch at one point in time and cannot speak for a later production run. Documents can also be reused across batches or edited. Treat a COA as one input among several, not proof. Research use only.

Laboratory Verification

Peptide Lab Reports & COAs.

Peptide COAs and lab reports published by suppliers, covering purity, HPLC and identity testing, with links to each original document.

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Where These Peptide COAs Come From

Each peptide COA below links to a certificate of analysis published by the supplier, or produced by a third-party lab on their behalf. Where a supplier has not published one, the listing shows “Report Pending”. PepLookup does not run tests or rehost documents, so you always read the original. A report appearing here only means the supplier made it accessible. We have not verified its claims.

What a Peptide COA Usually Shows

Identity: confirms the compound, usually by mass spectrometry (MS).
Purity: the percentage reported by HPLC, with the method named.
Batch or lot number: should match the vial you receive.
Test date and lab: who ran it and when.
Extras (sometimes): endotoxin, sterility or heavy metals.

A COA describes one batch at one point in time. It is one input, not proof. Research use only.

How to Read a Peptide COA

A peptide COA can look intimidating on first read. Our free COA Reader explains each field, including HPLC purity, mass spec results, batch number and test date, and points out common red flags such as missing batch numbers or no chromatogram.

Open COA Reader

Where These Peptide COAs Come From

What a Peptide COA Usually Shows

Identity: confirms the compound, usually by mass spectrometry (MS).

Purity: the percentage reported by HPLC, with the method named.

Batch or lot number: should match the vial you receive.

Test date and lab: who ran it and when.

Extras (sometimes): endotoxin, sterility or heavy metals.

A COA describes one batch at one point in time. It is one input, not proof. Research use only.

Peptide Lab Reports & COAs.

Where These Peptide COAs Come From

What a Peptide COA Usually Shows

How to Read a Peptide COA

Peptide Lab Reports & COAs.

Where These Peptide COAs Come From

What a Peptide COA Usually Shows

How to Read a Peptide COA

Frequently asked questions.