How to read a peptide COA
To read a peptide certificate of analysis, confirm five things: a named accredited lab, a test date and batch number that matches your vial, an identity result (by mass spectrometry), a purity result (by HPLC), and a way to verify it on the lab's own portal. If any of those is missing, treat the report as marketing rather than proof.
Who we are: We're TrueVial. We don't sell peptides, and we take no money from vendors. We buy products ourselves, have accredited labs test them, and publish exactly what they find. So we have no source to push. Below is simply the method, so you can check any source yourself.
What a COA actually is
A certificate of analysis, or COA, is a laboratory report on one specific batch of a product. It is not a general seal of approval and it is not a safety rating. It answers narrow, factual questions about what a lab measured in a sample, on a date, from a batch. The value of a COA depends entirely on who ran it and whether you can verify it.
The parts of a COA, and what each one means
| Field on the report | What it tells you |
|---|---|
| Laboratory name and accreditation | Who did the work and whether they hold a standard such as ISO 17025. No name means no accountability. |
| Test date | When the sample was measured. Old dates on a "current" product are a mismatch worth questioning. |
| Batch or lot number | Which specific run this report covers. It must match the batch on your vial. |
| Sample or product name | What the lab was told it was testing. Compare it to what you ordered. |
| Method | How each result was produced. HPLC for purity, mass spectrometry for identity. |
| Identity result | Whether the material is actually the compound claimed. This is the question that protects you most. |
| Purity result | The percentage of the sample that is the intended compound versus impurities. |
| Verification reference | A portal link, QR code, or report ID that lets you confirm the result on the lab's own site. |
How to read it, step by step
- Find the lab and accreditation. A named laboratory with a standard such as ISO 17025. If neither is present, stop here.
- Check the date and batch. Then match that batch number to the one printed on your vial. A report for a different batch does not describe yours.
- Read the identity result. Confirmed by mass spectrometry. Is it the molecule the label claims, or something else?
- Read the purity result. The HPLC percentage. Read it together with identity, never on its own.
- Verify on the lab portal. Confirm the same numbers on the laboratory's own site, not just the image you were sent.
Identity and purity are two different lines
This is the mistake that costs people the most. A COA can show a high purity number and still never confirm identity. Purity by HPLC tells you how clean the sample is. Identity by mass spectrometry tells you whether it is even the right compound. A sample can be 99 percent pure and still be the wrong molecule entirely, so a report that reports one without the other has answered only half the question.
Red flags of a fake or edited COA
- No batch number or date. A result with no batch could belong to any vial. Yours is not that vial.
- No named lab or accreditation. An unsigned, unaccredited report is a number with no one standing behind it.
- Purity only, no identity. The easy question answered, the important one skipped.
- Signs of editing. Mismatched fonts, blurry or cropped sections, or values that look pasted in.
- No way to verify. No portal, no report ID, no QR. If you cannot confirm it at the source, it is just a picture.
- Batch mismatch. The batch on the COA does not match the batch on your vial.
Working out whether a whole source is trustworthy, not just one report? See the companion guide: How to verify any peptide source.
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Common questions
What should a peptide COA include?
A trustworthy peptide certificate of analysis names the laboratory and its accreditation, gives a test date and a batch or lot number, states the methods used (HPLC for purity and mass spectrometry for identity), reports both an identity result and a purity result, and can be verified on the lab's own portal.
How do I know if a COA is fake?
Warning signs include no batch number or date, no named lab or accreditation, only a purity figure with no identity confirmation, edited or mismatched fonts and blurry sections, and no way to verify the report on the lab's own portal. A batch on the COA that does not match your vial is a red flag on its own.
What is the difference between HPLC and mass spectrometry on a COA?
HPLC measures purity, the percentage of the sample that is the intended compound versus impurities. Mass spectrometry confirms identity, whether the material is actually the compound claimed. A complete COA uses both.
Does a good COA mean the product is safe to use?
No. A COA reports composition, such as identity and purity for a batch. It is not a statement that a product is safe, sterile, or appropriate for any use. Consult a licensed healthcare professional for any health decision.