Why test your own vial if the vendor already published a COA?

A vendor's Certificate of Analysis reports on the batch the vendor tested, at the time they tested it. It says nothing specific about the individual vial in your hand. Sending your own aliquot to an independent lab is the only thing that speaks to what you actually received. A purity and identity test typically costs a few tens of dollars, far less than the vial itself.

Where can I send a research peptide to be tested?

Three labs the research community uses are Janoshik (Czech Republic), Freedom Diagnostics Testing (United States), and ACS Labs (United States). Each offers HPLC purity plus mass-spec identity. pepmg does not run, endorse, rank, or profit from any of them. Check each lab's own site for current pricing and to submit a sample.

How do I know a peptide COA is real and not edited?

A PDF can be edited and a template can be reused, so the document alone proves little. What separates a real report from a forgeable one is a checkable source: a unique verification key you paste into the lab's own verification page, or a lookup in the lab's public COA database. If a report cannot be confirmed on the testing lab's own system, treat it as unverified.

Test your own vial

A vendor's COACertificate of Analysis: a lab report stating a batch's measured identity and purity. tells you about a batch the vendor tested. Independent testing of the vial you actually hold is the only thing that speaks to what you actually have. It is cheaper than most people assume, and it is the default move for a careful researcher, not an extreme one. Here is how to do it, where to send a sample, and how to confirm the report you get back is real.

▸ Why test your own vial

A Certificate of Analysis is a lab's report on a specific batch of material, at the moment it was tested. That is genuinely useful, and our COA guide covers how to read one. But a batch COA says nothing about the individual vial in your hand: how it was filled, what actually went into it, or how it was handled after the batch was sampled. The vial you received is only as represented as the vendor's batching and honesty make it.

Independent testing closes that gap. You send a small amount of your own material to a lab and get back a report on your sample. Weigh the cost against what you are checking. A purity and identity test typically runs a few tens of dollars, and you can confirm each lab's current pricing on its own site. That is far less than the vial itself, and far more informative than an unverified marketing claim on a product page. For research-use material, commissioning your own test is a reasonable baseline, not a paranoid one.

pepmg does not test, certify, endorse, rank, or profit from any lab. The labs below are named because researchers use them and because their results can be independently verified. This page teaches you to verify a sample. It is not an endorsement of any specific lab, and no lab pays to appear here. Check turnaround and pricing on each lab's own site before you send anything.

▸ Where to send it

Three labs the research community relies on. Each tests HPLCHigh-Performance Liquid Chromatography — a lab method that separates a sample's parts to measure how much of each is present. purity and mass-specA lab method that measures the mass of a sample's molecules to help confirm a compound's identity. identity. Pricing lives on each lab's own site; we do not print prices here because they change and we will not guess.

Janoshik · Czech Republic

Tests: HPLC purity, mass-spec identity, and quantity. Turnaround: standard is about two weeks, with paid expedited service available. How results are verified: results are lab-hosted with a unique verification key you paste into Janoshik's verification page to confirm the report is authentic and unaltered, and there is a public results database you can browse. This is the community standard for verifiable results, and it is the lab behind the real example on our COA guide.

janoshik.com ↗ · pricelist ↗ · verify a report ↗ · public database ↗

Freedom Diagnostics Testing · United States

Tests: an intake service offering HPLC purity and LC-MS identity (one vial covers Purity & ID; you can add one vial each for optional Endotoxin or Conformity testing), submitted through their online intake form. Turnaround: notably fast, about 24 to 48 hours. How results are verified: they maintain a publicly verifiable COA database (running since 2023) where reports can be looked up.

freedomdiagnosticstesting.com ↗

ACS Labs · United States

Tests: HPLC purity, mass-spec identity, and a third-party COA. Turnaround: about 9 to 11 days. How results are verified: ISO 17025 accredited, and they ship nationwide, so a sample can be submitted from anywhere in the US.

acslabtest.com ↗

▸ The process, step by step

Order or request the test online. On the lab's site, choose a purity and identity test and pay for it. Labs will confirm what they need; typically it is about one vial's worth of material.
Get your task or order number. The lab issues a reference number that ties your payment to the sample you are about to send. Keep it.
Ship a small aliquot. Send the amount the lab asks for, labeled with your reference number, following the lab's shipping instructions. Lyophilized (freeze-dried) powder ships more simply than reconstituted material.
Receive your COA. When testing finishes, the lab issues a Certificate of Analysis for your sample: identity, purity, and often quantity.
Verify it. This is the step people skip and the one that matters most. Paste the verification key into the lab's own verification page, or look the report up in the lab's public COA database. A key or database entry that resolves on the lab's own system is what separates a real COA from a PDF anyone could edit.

▸ How to read what comes back

The report answers the same three questions a vendor COA does. Briefly:

Identity. Is this actually the peptide on the label? Confirmed by mass spectrometryA lab method that measures the mass of a sample's molecules to help confirm a compound's identity. : the measured mass should match the peptide's expected mass.
PurityThe share of a sample that is the intended compound, usually reported as a percentage on a COA. . Stated as a real percentage, not just "passed." Research-grade is typically ≥98%.
Quantity / net content. Does the vial hold the labeled milligrams, and how much of that labeled mass is actually peptide rather than salt and residual water?

We keep this short on purpose. The full explanation of each number, including why net peptide contentThe actual mass of peptide in a vial, after subtracting non-peptide material like salts and water. changes the real $/mgPrice divided by the milligrams of active compound — the like-for-like way to compare cost across different vial sizes. you paid, lives in the COA guide.

▸ Honest limits

It describes your sample at test time. A test tells you what your aliquot was when the lab measured it. It does not vouch for anything you did with the vial before or after.
It is not a safety or human-use clearance. Purity is not approval. These are laboratory reference materials, and a clean COA says nothing about fitness for any use in humans.
A test is only as good as its verification. An unverifiable report proves little. The value is in the checkable key or public database entry, which is exactly why we point you to labs that offer one.
pepmg does not stand behind any result. We do not run the labs, test the material, or certify what a report says. We explain how to get an independent answer and how to confirm it is real. The rest is genuinely yours to do.

How to read a COA, in full → · All guides & tools → · Back to the index →

All products listed are sold by third-party vendors for laboratory and research use only (RUO). pepmg sells nothing, ships nothing, and gives no medical, dosing, or human-use guidance. Listings are price-tracking data, not endorsements.