A certificate of analysis (COA) is a lab report on a sample from one production batch. Research peptide stores publish them to show what a batch contained when it was tested. A COA is only as useful as your ability to tie it to the vial in front of you and to the lab that issued it.
Stores sell these compounds as research chemicals, not for human use. A COA describes a sample's chemistry. It doesn't show that a product is safe or suitable for any use.
What PeptidesGrid shows about COAs
Each store page has a COAs line taken from the store's own public pages, with the date they were checked:
- per-batch public: the store publishes a certificate of analysis for each production batch.
- on request: the store says it sends COAs when asked.
- none found: no COAs were found on the store's public pages when they were checked.
- blank: the site couldn't confirm the policy, which is not the same as the store not having one.
PeptidesGrid doesn't review or verify individual reports. "Per-batch public" means the store publishes them, not that anyone has checked them.
The parts of a COA
- Lab name and contact details. The lab that ran the tests, with a website or accreditation number you can look up on your own.
- Client name. The company that sent the sample. It should be the store, or the store should say why it isn't, for example because the report comes from its manufacturer.
- Product and label amount. The peptide tested and the amount per vial on its label, such as 10 mg.
- Batch or lot number. This ties the report to one production batch. The same number should appear on the vial label or the product page.
- Dates. When the lab received the sample and when it issued the report. A report can't cover a batch made after it was issued.
- HPLC purity. High-performance liquid chromatography separates a sample into its components. Purity is the main peak's share of the total, such as 99.1%. Many reports include the chromatogram, a trace with one tall main peak and smaller side peaks; the stated figure should match it.
- Identity by mass spectrometry. Mass spectrometry (MS) measures the molecular mass of what is in the sample. The expected and observed masses should agree within the lab's stated tolerance. HPLC purity alone doesn't prove the main peak is the right peptide; MS confirms identity.
- Content. Some reports give the measured milligrams in the vial. Purity and content are separate: a vial can be highly pure and still hold less than its label says.
- Other tests. Some reports add endotoxin, heavy metal or water content results. A test that isn't on the report isn't covered by it.
- Report number and sign-off. A unique report number and the analyst's or reviewer's name or signature.
What "per-batch" means
Peptides are made in batches, and two batches of the same product can differ. A per-batch COA covers one batch only. A single report reused across every batch, or shown unchanged for years, says nothing about the batch you would receive. Match the report's batch number to the vial or listing.
Red flags
- No batch or lot number, or a number that doesn't match the vial.
- The same report, or the same figures, shown for different products, sizes or batches.
- A report that names a different client or a different store, with no explanation.
- Signs of editing: mismatched fonts, boxes pasted over text, blurred areas around key figures, or a purity figure that doesn't match the chromatogram.
- Only a cropped screenshot, with no way to see the whole report.
- No lab name, or a lab you can't find anywhere except the store's own site.
- A QR code or verification link that leads to the store's site rather than the lab's.
One red flag isn't proof; stores sometimes post the wrong file. It is a reason to ask the store and the lab before relying on the report.
How to check a report with the lab
- Find the lab yourself. Search for its name and go to its own website. Don't rely only on links, emails or phone numbers printed on the report.
- Use the lab's verification tool if it has one. Many testing labs let you look up a report by its number or a code printed on it.
- If there's no tool, email the lab with the report number, date and client name, attach the copy you have, and ask whether it issued the report as shown.
- Compare the lab's version with the store's copy. Client, product, batch, dates and results should match exactly.
- Keep copies of the report and the lab's reply, with the date.
Labs don't always answer, and some confirm reports only to the client who paid for them, so no answer proves nothing. A lab saying it didn't issue a report, or that the figures differ from its records, is a serious warning. You can tell other buyers through a buyer report with your evidence.
Store COAs and independent testing
A store's COA shows what the store chose to test and publish. Independent testing of samples that buyers purchased is a separate check. Finnrick Analytics publishes results from customer-submitted samples; see Finnrick scores explained. PeptidesGrid doesn't test products itself.
General information about lab reports, not an assessment of any store's documents. Last reviewed Sep 25, 2026.