How to Read a Peptide Certificate of Analysis (COA)

What is a certificate of analysis?

It's the testing lab's record of what it found in a sample from one batch. ICH Q7, the international good practice guideline for makers of drug ingredients, sets out the usual pattern: a certificate names the material and its batch, lists each test performed with its acceptance limits and numerical results, and is dated and signed. The World Health Organization's model certificate follows the same shape, ends by stating whether the sample complies with the specification, and notes that one is usually prepared for each batch.

The walk-through below uses a real certificate, the one published for a batch of BPC-157, and describes only what it prints.

12345

• 1Header. Who tested the sample, for whom and when, and the report number.
• 2Sample information. Product, form, batch, labeled quantity, and cap and crimp colors.
• 3Test results. Each test's specification, headed “Reference Standard”, beside its result.
• 4Chromatogram. The method line and the detector trace behind the purity figure.
• 5Verification. Report number, access code, QR code and the lab's verification address.

Open the full certificate (PDF)

Pure Peptides describes its certificates as "issued by an independent third-party laboratory", and the full set sits in the certificate of analysis library.

The header answers who and when. On this certificate the testing lab is Kovera Labs. The client line, PurePeptides, names the company that sent the sample. The certified date is 07/30/2026, and the report number, KVR-2026-BB7E5F, appears at both the top and the foot of the page. The report number is the certificate's own ID, and it's what the lab will ask for if anyone queries a result.

BPC-157 on this siteBPC-157 ReferenceBPC-157 ResearchRegeneration Peptides

Why check the batch number before the purity?

Because the certificate describes a sample, and the sample came from one batch. The "Sample Information" box says which:

Sample information, as printed

• ProductBPC-157The compound named on the vial
• FormLyophilized powderA freeze-dried solid
• BatchPP/BPC/062026The production batch the sample came from
• Labeled Qty10 mgThe amount stated on the label
• Cap ColorWhiteThe color of the plastic cap on the vial
• Crimp ColorSilverThe color of the metal seal crimped around the stopper

The box also prints a molecular formula and a CAS registry number for the substance.

The batch number is the link between paper and vial. If a vial or its paperwork carries a batch number, it should match this one exactly. A different batch number means the certificate isn't about that vial, however good its numbers look. The cap and crimp colors add a physical check, and the certificate also prints a photograph of a vial.

This document-to-material check should happen before interpreting any numerical result. A technically strong analytical report cannot compensate for an uncertain link between the report and the sample.

What do "Reference Standard" and "Result" mean?

The results table has two columns. The left one is headed "Reference Standard" and holds, in brackets, the target each test had to meet. The certificate's opening line says the sample met the stated specifications, so these bracketed values are the specifications. The right column, "Result", is what the lab measured, with a tick where the result met its target.

Three tests, three different questions

• Purity

  Specification>98%

  Result99.621%

  Answers: The main peak's share of what the detector recorded at one wavelength. Not a weight.

• Net Content

  Specification~10 mg

  Result12.11 mg

  Answers: How much peptide the lab found, by weight.

• Identity Confirmation (LC-MS)

  SpecificationBPC-157

  ResultBPC-157

  Answers: Whether the main component is the expected peptide.

In analytical chemistry, a reference standard means a characterized substance used as the standard in an assay, identity or purity test. Guidelines call the targets themselves acceptance criteria.

Purity is an HPLC figure: the main peak's share of everything the detector recorded at one wavelength. It's not a weight, which is why what a purity figure does and doesn't count matters before you compare numbers.

Net content is a separate measurement: how much peptide the lab found, by weight. This batch measured 12.11 mg against a specification of about 10 mg.

Identity is a different question again. Purity says the sample is mostly one thing, while identity supports whether the main component is the expected peptide. The identity result is reported as "Identity Confirmation (LC-MS)", with BPC-157 shown as the target and result. This indicates the laboratory's reported conclusion. The certificate does not include the mass spectrum.

What does the chromatogram add?

The results table gives the purity figure; the chromatogram shows the detector trace behind it. The method line reads "Method: RP-HPLC | Column: C18 | Detection: DAD @ 214 nm", meaning reversed-phase HPLC on a C18 column, detected at 214 nanometers.

On this trace, one tall peak labeled BPC-157 appears just after 14 minutes, with small early disturbances. Because no peak table is printed, the shape can be reviewed but individual peak areas cannot.

ABCD

• AThe method line: reversed-phase HPLC on a C18 column, detected at 214 nm.
• BOne tall peak, labeled BPC-157, just after 14 minutes.
• CSmall early disturbances.
• DThe baseline.

Not printed: a peak table, so the shape can be reviewed but individual peak areas cannot.

Check whether the chromatogram supports the reported purity: look for a dominant target peak, minor peaks or shoulders, a stable baseline and enough method detail to support the conclusion.

How do you know a certificate is genuine?

Verify the certificate with the issuing laboratory. This one prints a report number, access code, QR code and koveralabs.com/verify, and the lab's verification page looks a certificate up by its report number. Compare the laboratory's record with the document: product, batch, date and results should match. For a stronger check, visit the laboratory's site directly rather than relying on the document's link or QR code. If the record is missing or differs, treat the certificate as unverified until the discrepancy is explained.

Verifying a certificate

• 1Note the report numberOn this certificate, KVR-2026-BB7E5F. The lab's verification page looks a certificate up by it.
• 2Go to the lab's site yourselfVisit it directly, rather than relying on the document's link or QR code.
• 3Compare the recordProduct, batch, date and results should match the document.
• 4Missing or different?Treat the certificate as unverified until the discrepancy is explained.

What can't a certificate tell you?

A COA has three important limits:

• Other batches. Results apply only to the batch identified.
• Changes after testing. The certificate reflects the sample "at the time of analysis", not later storage or handling.
• Unlisted attributes. It cannot support a test or attribute that was not reported.

Quick checklist

• The batch number matches the vial or its paperwork.
• The product, form and labeled quantity match.
• The cap and crimp colors match, where they're printed.
• Every result meets its specification.
• A method line and chromatogram support the purity figure.
• The report checks out on the issuing lab's own site.