Peptide COA Check · any lab · free
What the paper shows
Photograph any peptide lab report (a Certificate of Analysis) and see what it shows — and what it doesn’t.
Cover or crop any names or order numbers before you upload.
or drop it here · up to 4 pages
Your file stays on your device. We only send page images to run the check, and nothing is stored.
Pages to read
One tap to show you’re a person, then the check runs.
Reading the page. This takes about 10 seconds.
Sample · a real report from our test set · nothing was uploaded
Things to look at ·
The vial and the paper
What no COA can tell you:
Independent lab data: Finnrick (finnrick.com), a consumer testing service, sends peptide samples to outside labs and publishes the results, and sells testing to the vendors it rates (its partner terms say so). Kalios has no relationship with it.
What a COA can and can’t tell you
A Certificate of Analysis is a lab’s report on one sample from one batch. A complete one answers six questions, the same six lines COA Check stamps: Shown, Partly shown or Not shown.
Identity. Mass spectrometry (MS) measures the molecule’s weight. A result within about 2 daltons of the compound’s known mass matches the name on the label. Purity alone can’t show that: a sample can be very pure and still be a different peptide. Where the report’s own identity result reads “Does not conform” or “Fail”, or names another compound, the slip marks identity Not shown, whatever the masses say.
Purity. HPLC separates the sample and reports the main peak as a percentage. It says how much of the powder is one substance, not which substance, and not how much powder is in the vial.
Quantity. A net-content test measures the milligrams actually in the vial. Printed next to the labeled amount, it shows whether the vial holds what the label says.
Safety tests. Endotoxin (LAL), sterility and heavy-metal tests look for contamination that purity and identity tests can’t see. Many reports on research peptides leave them out, and the slip says so when one does.
Traceability and lookup. A lab name, report ID, batch number, test date and a named analyst tie the paper to one tested sample. A report you can look up on the lab’s own site, by its ID, is one you can check for yourself.
What no COA can tell you: whether your vial came from the batch that was tested, how it was shipped and stored since, or whether the compound is safe or right for any use. A report is only as useful as the match between its batch number and the vial in your hand.
Reading a COA: four questions
What is a Certificate of Analysis (COA)?
A lab’s report on one sample from one batch. It lists what was tested (identity, purity, quantity and sometimes contaminants), the method for each test, the results, and who signed it off. It describes that sample, not every vial sold under the same name.
How do I read the purity on a peptide COA?
Purity is usually an HPLC result: the percentage of the sample in the main peak. COA Check marks purity as shown only when the method is named next to the number. Purity says how much of the powder is one substance. It doesn’t say which substance (that’s identity) or how much is in the vial (that’s quantity).
What do identity and mass mean on a COA?
Identity is usually shown by mass spectrometry (MS), which weighs the molecule. A mass-spec result usually prints the mass found next to the compound’s expected mass; COA Check counts the two as a match within 2 daltons. A bigger gap is a question for the lab, because a very pure sample can still be the wrong molecule.
How do I check that a COA belongs to my vial?
A COA belongs to a vial only when its batch or lot number matches the vial’s, and its compound and amount match the vial’s label; a match doesn’t show that the vial holds what was tested. Where a lab runs a lookup, a report can be found on the lab’s own site by its report ID, and some labs also ask for a key printed on the report; COA Check links a lookup only for the labs it knows, at an address it has checked, never a link taken from the report. A report for another batch says nothing about your vial.
How COA Check works: your browser turns each page into an image no larger than 1568 pixels and sends only those images. Anthropic’s Claude model reads them and returns the facts it finds; the stamps come from fixed rules that run in your browser. Cloudflare Turnstile checks that a person is asking. Kalios keeps nothing: no files, no images, no results. Anthropic deletes API inputs and outputs within 30 days under its standard terms.
COA Check reads documents. It tests nothing, and it never rates a compound, a lab or a seller.