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.
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.
Things to look at ·
What this document cannot tell you
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.
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.
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. Look for the method 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. The report should print the mass it found next to the compound’s expected mass. Within about 2 daltons is a match. A bigger gap is worth asking the lab about, because a very pure sample can still be the wrong molecule.
How do I check that a COA belongs to my vial?
Match the batch or lot number on the report to the one on your vial, and the compound and amount to its label. Then look the report up on the lab’s own site with its report ID, finding the site yourself rather than through a link from the seller. A report for another batch says nothing about your vial.