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Peptide COA checker

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Type in what your vial label and certificate of analysis say. The checker compares seven things: identity, lot, content, purity, test date, lab and whether the report can be verified. Each gets a pass, warning or fail with the reason, plus questions to send the supplier. We don’t store what you enter.

Compound name
Lot or batch number
Amount and purity
For example 10
Often listed as content, quantity or net peptide
For example 99.2
The analysis or report date
Testing lab
Is the lab independent of the supplier?
Tests listed on the COA
Does the COA print a lab verification code, QR code or link?
Clear

Results

Fill in what your COA and vial label say, then press “Check this COA”. Leave a field blank to skip that check.

This checker compares the fields you enter; it does not authenticate documents or test products. Thresholds are our review guidelines, not regulatory standards. Products from the suppliers we list are sold for laboratory research use only.

What a COA is

A certificate of analysis is the lab report for one production lot. It should name the compound, the lot number, the lab, the test methods, each result with its acceptance limit, and the date of the analysis. It describes the lot that was tested, so it only tells you about your vial when the lot numbers match.

The six things to check

  1. Identity. The compound on the COA matches the label, confirmed by mass spectrometry.
  2. Purity. The HPLC purity figure. We pass 98% or more and warn from 95%.
  3. Content. The measured amount is close to the amount on the label: 90–110% passes, 80–120% warns.
  4. Batch. The lot on the COA is the lot printed on your vial.
  5. Date. The test is recent: within 12 months passes, and a date in the future fails.
  6. Lab. A named lab, ideally independent of the supplier, with a way to confirm the report on its own site.

HPLC vs mass spec

HPLC (high-performance liquid chromatography) separates a sample into its components and reports the main peak as a share of the total: that share is the purity. It can’t say what the main peak is. Mass spectrometry (MS, or LC-MS when it follows a chromatography step) measures molecular mass and compares it with the expected mass of the compound, which confirms identity. A COA with HPLC alone tells you the sample is mostly one thing, not which thing.

Why content matters as much as purity

Purity is a percentage of what’s in the vial; content is how much compound there is. A vial labelled 10 mg can show 99% purity and still hold 7 mg, because purity ignores the total. Water, salts and counter-ions from manufacturing add weight without showing up as impurities. That’s why we compare the measured content with the label as a separate check.

How to verify a COA with the lab

  1. Find the lab name and the report number, verification code or QR code on the COA.
  2. Open the lab’s website by typing its address, not by following a link printed on the document.
  3. Look the report up and check that the compound, lot, results and date match what you were sent.
  4. If there’s no lookup, email the lab with the report number and ask them to confirm it was issued.
  5. Treat a COA with no lab name, no lot number or no way to confirm it as unverified.

What our suppliers publish

What we saw when we checked each store’s lab reports in September 2026:

  • PSPeptides. Product pages link batch reports for purity, heavy metals, endotoxin, sterility and fentanyl, plus a Certifications page. The store states 99%+ purity by HPLC and mass spectrometry. Our PSPeptides review.
  • Alera Research. Every product page shows the batch COA with a lab search code. The BPC-157 10mg report we checked was from Freedom Diagnostics, tested by HPLC with mass spectrometry (HPLC-MS), at 99.035% purity. Our Alera Research review.
  • Peptide Confidential. Each batch has a published third-party COA, which you look up with the batch code printed on the vial label. Our Peptide Confidential review.

Frequently asked questions

What does COA mean?

COA stands for certificate of analysis: a lab report for one production batch (lot) that states what was tested, by which method, the result and the date. For a research peptide it usually shows HPLC purity, often a mass spec identity result, and sometimes the measured content in mg.

What purity is good for a research peptide?

This checker passes HPLC purity of 98% or more, warns from 95% to under 98% and fails anything below 95%. Those are our review guidelines, not a regulatory standard, so check what your own lab work requires.

Is HPLC enough?

No. HPLC shows what share of the sample is the main peak, which is purity. It doesn’t prove that the main peak is the compound on the label. Mass spectrometry (MS or LC-MS) measures molecular mass, which confirms identity. A complete COA has both.

What if the batch number doesn’t match?

Then the COA doesn’t describe your vial, whatever it says. Ask the supplier for the COA of the lot printed on your vial. A supplier that tests every batch can send it; one report reused across several lots tells you little about yours.

How old can a COA be?

We pass a test date within the last 12 months, warn between 12 and 24 months, and fail anything older or dated in the future. Stock turns over, so an old date often means the report is for an earlier lot.

How do I verify a COA with the lab?

Find the lab name and the report number, verification code or QR code on the COA. Open the lab’s website yourself rather than following a link on the document, look the report up and check that the compound, lot, result and date match. With no code, email the lab the report number and ask them to confirm it.

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