How to Read a Peptide COA — and Spot a Fake One

For laboratory research use only. This article explains how researchers evaluate Certificates of Analysis (COAs) issued by third-party analytical laboratories. It contains no dosing, human-use, or clinical guidance.

A peptide Certificate of Analysis is only as useful as three checks you can run in under five minutes: who issued it (a named laboratory you can contact, not the seller), whether that laboratory will confirm the document is theirs (most independent labs publish a verification page), and what the report actually measured (purity alone, or purity plus identity, content, endotoxin and solvents). This guide walks each check against a real published certificate, then gives the ten-point checklist for spotting a fake.

What a COA is, and what an SDS is not

Two documents get confused. A Safety Data Sheet (SDS), formerly the MSDS, describes the hazards of a substance in general: handling, storage, first aid, spill response. In the United States its 16-section format is set by the OSHA Hazard Communication Standard, 29 CFR 1910.1200. An SDS for "BPC-157" is identical for every vial ever made, because it describes the molecule, not a batch.

A Certificate of Analysis describes one specific sample: what a laboratory measured in it, by which method, and when. It is the only one of the two documents that can tell you anything about the material in your hands. If a supplier answers a request for testing data with an SDS, they have answered a different question.

Third-party versus in-house certificates

An in-house certificate is produced by the seller or its manufacturer. It may be accurate, but it cannot be checked by anyone outside that company. A third-party certificate is produced by an independent analytical laboratory and carries that lab's name, a report or task number, and usually a way to confirm the report with the lab directly. "Third-party tested" on a product page means nothing until you can see which third party, and until that third party will vouch for the specific report.

A third-party certificate also records who ordered the test. Most lab report templates carry a client field. The client can be the seller, the manufacturer, a distributor, or an individual who sent in a sample. That field tells you the chain of custody: a report ordered by the manufacturer describes the manufacturer's batch, which is useful, but is a different statement from "the seller sent this vial for testing".

The ten-point checklist

1. The report names the testing laboratory, not the supplier

A legitimate COA is issued by an independent lab and identifies it at the top: name, contact details, and a report or task number. Janoshik Analytical and Colmaric Analyticals are common in this space. If the certificate sits on the seller's own letterhead with no third-party laboratory named anywhere, it is a marketing document.

2. The compound and batch identifier are stated

Every COA should state the compound, the labelled amount, and a batch or lot identifier. Without a batch identifier, the report describes some sample of that compound at some point, and there is nothing to tie it to any particular vial.

3. The analysis date is recent enough to mean something

Look for the date the analysis was conducted, not the date the PDF was exported. A report more than about twelve months old most likely describes an earlier production run. An old date is not proof of a problem, but it lowers what the report can tell you about current stock.

4. The method is named, and ideally the raw trace is shown

The strongest reports reproduce the HPLC chromatogram: retention time on the x-axis, detector response on the y-axis, a dominant main peak and an integration table. Many commercial reports print only the results table. That is acceptable if the lab will verify the report, but a chromatogram lets you check the purity figure yourself. Our guide to reading an HPLC chromatogram on a peptide COA covers what to look for.

5. The purity figure looks measured, not written

Integration software reports to two or three decimals: 99.882% on the Selank certificate, 99.019% on the Semax certificate, 99.834% on the Tesamorelin certificate. A certificate that says only ">99%" with no decimals and no trace is stating a specification, not a measurement.

6. Identity is confirmed, not assumed

HPLC reports how pure a sample is. Mass spectrometry reports what it is, by matching the observed molecular mass to the theoretical mass of the sequence. A report with purity but no identity panel leaves open the possibility of a highly pure batch of the wrong peptide. Some labs infer identity from retention time against a reference standard instead; that is weaker than a mass spectrum, and a report should say which approach it used.

7. Content is measured, not just labelled

Better reports give the measured amount of peptide in the vial next to the labelled amount, for example a vial labelled 10 mg that measures 11.37 mg. This is your check on underfill. A certificate that never states a measured amount gives no assurance about how much material is present.

8. The file itself has not been edited

Open the PDF's document properties. Lab reports are usually generated by instrument or reporting software. An author field naming the seller, or a creation tool such as a photo or graphics editor, is a reason for caution, because that is how altered certificates are made.

9. The laboratory will confirm the report

This is the decisive check. Many independent labs print a unique key on each report and publish a page where anyone can enter it; the lab then confirms whether it issued that report and shows the original. Where no key exists, most labs will confirm a report number by email. A seller who will not name the lab has told you the answer already.

10. The seller can explain which batch the report covers

Ask which batch identifier the certificate describes and how it relates to the vial you would receive. A clear answer, even "this report covers the manufacturer's batch that our current stock comes from", is more useful than a vague one.

Cross-referencing a batch number, and what to do when it does not match

The batch identifier is the link between a report and a vial. When you receive material:

Find the identifier on the vial label or packaging.
Compare it with the batch field on the certificate published for that product.
If they match, the report describes your material's batch.

Two outcomes need a follow-up rather than an assumption. If the identifiers differ, the certificate describes another batch; ask the seller for the report covering yours. If the certificate has no batch identifier, or the vial carries none, the report cannot be tied to any particular material. Treat it as evidence about the compound in general, not about your vial.

Verifying a Janoshik report with its key: a worked example

Janoshik Analytical, an independent laboratory in Prague, Czech Republic, prints a unique verification key at the foot of every report and hosts a lookup at janoshik.com/verify. The certificate published for Selank 10mg on this site, reproduced on its Selank certificate page, reads field by field:

Task number #146995, with testing ordered 18 March 2026 and the sample received 10 April 2026.
Sample Selank 10mg, batch LKB-2026.
Tests requested: assessment of a peptide vial.
Results: 11.37 mg of Selank measured in the vial, and purity of 99.882%.
Analysis conducted 14 April 2026, signed.
Verification key WK2RPZU3GN4X.

Enter that key at the lab's verification page and the lab shows whether the report is genuine. That single step defeats the most common forgery, a real report with its numbers edited, because the lab returns its own copy.

Read what the report does not contain just as carefully. It gives measured content and HPLC purity. It does not include a chromatogram image, a mass-spectrometry identity panel, an endotoxin result or residual solvents. The client field names the party that ordered the test.

What the certificates published on this site show

The certificates in the Optimized Aminos COA archive are Janoshik Analytical test reports. Each names the laboratory, a task number, the sample, a batch identifier, the analysis date, the measured amount of peptide in the tested vial and its HPLC purity, and a verification key you can check at the lab's site. They do not include chromatogram images, mass-spectrometry identity panels, endotoxin or residual-solvent results. On the certificates published here, the client that ordered the test is not Optimized Aminos. Not every product has a certificate: USP-grade reagents such as bacteriostatic water, and some peptides, currently have none. Where a certificate exists, the product page links it and states the purity it records, and the certificate has a page of its own — DSIP at 99.711%, GHK-Cu at 99.2% — carrying that figure as text rather than only inside a PDF.

Red flags at a glance

No named third-party laboratory, or a "lab" with no verifiable presence
No report number and no way to confirm the report with the lab
A purity figure with no decimals and no trace
The same certificate served for different batches or product sizes
No batch identifier, or one that never changes
An analysis date well over a year old for current stock
A seller who will not name the lab or say which batch a report covers

Frequently Asked Questions

Is a COA from the manufacturer worse than one ordered by the seller?

Not necessarily. A manufacturer-ordered report from an independent lab is still third-party analysis of that batch. What matters is that the lab confirms the report and that the batch it names is the batch being sold. The client field tells you who ordered it; it does not change what was measured.

Can a verification key prove the vial I received is the vial that was tested?

No. A key proves the laboratory issued that report for that sample. It says nothing about which vials came from the same batch. The batch identifier on the report and on your vial is what connects the two, which is why a missing or mismatched batch identifier matters.

Why would a genuine report show more peptide than the label?

Fill tolerances run in both directions, and many manufacturers overfill slightly so that a vial never tests below its label. A measured amount above the labelled amount, such as 11.37 mg in a 10 mg vial, is common and not a warning sign. A measured amount well below the label is.