Peptide COA Checklist: Fields and Warning Signs
Check the fields on a peptide COA: laboratory, lot number, methods, reported results and verification details. Know which gaps need clarification.
Use this short checklist to decide whether a Certificate of Analysis gives you enough information to begin a documentation review. It checks completeness; it does not authenticate a file or certify a supplier.
Keep the complete document open. A crop, a product badge, or a percentage quoted in a listing can omit the fields needed to connect a result to a sample.
Six fields to record
| Field | Record | Question to resolve |
|---|---|---|
| Issuing laboratory | Name and an independently located contact or verification channel. | Can the laboratory confirm it issued this record? |
| Report / task identifier | The report number and any verification key, copied from the full file. | Does the lab record match the copy supplied? |
| Sample and lot | Sample name, batch code, and the supplier’s documented link to the supplied lot. | Is this the report for this material, rather than a similarly named product? |
| Dates | Sample-received and analysis dates where present. | What do the dates actually describe? They are not expiry dates. |
| Results | Every relevant result label, value, unit, and comments as printed. | Are percentage, milligrams, and concentration kept separate? |
| Method and scope | Tests named on the report; supporting method information when available. | Which questions remain unanswered by this document? |
A missing field is a question, not a verdict
A laboratory-issued summary can be genuine without containing a full chromatogram or every method setting. Ask which supporting records exist. Likewise, a lab without a public portal may confirm a report through its own contact channel.
- Unreadable or cropped file: request the complete, legible original.
- No clear lot match: ask the supplier to document the link. A product name or SKU alone does not identify a production lot.
- Different results in two copies: ask the issuing laboratory to identify the applicable record. Do not average the numbers.
- A needed test is absent: record it as not reported on this document. Do not infer sterility, stability, or another property from purity.
Questions before ordering
Ask which batch will be supplied and whether its report is published. If a listing uses a generic specification, ask for the sample-specific report rather than treating the specification as a test result. See batch-specific reports versus generic COAs.
For PSL materials, open Batch Reports and review product-label disclosures alongside the original file.
Next: verify the original report
Janoshik’s official verification form asks for a task number and unique key. Both must come from the original document; a task number alone is insufficient for that form.
The worked laboratory-report verification guide covers source verification and batch matching in detail. Once the file is located, use the PSL receiving-record worksheet to keep its fields with your laboratory records.
Research Use Only
This guide is for researchers and lab staff reviewing lab reports. Materials discussed are for laboratory research only. They are not for human or veterinary use.
Check our published batch reports
Every active catalog lot has a published Janoshik report. Peptide reports list tested-sample purity and reported amount; the solution report lists benzyl alcohol concentration. Open the original file and match the batch.
Examples of published reports
Each report covers the sample and lot named on that document. Materials are for laboratory research only.
Related Analytical Guides
How to Verify a Peptide Lab Report: A Practical Batch Checklist
Check a report with the issuing lab, match the batch to your order, and save a useful research record. Includes a published Tesamorelin report example.
Batch-Specific COAs vs Generic COAs: Why Lot Traceability Matters
How a real batch lab report differs from a generic spec sheet, and why the lot number links your vial to the test data.
Peptide Identity vs Purity vs Content: What Each Analytical Result Actually Tells You
Identity, purity, and content answer three different questions. Learn what each result means and how to read them together on a lab report.