How to Verify a Janoshik Certificate of Analysis (COA)

If you've spent any time researching peptide suppliers in Canada, you've probably encountered the name Janoshik Analytical. It's the most widely recognized independent testing laboratory in the peptide industry, and a Janoshik-verified COA has become the gold standard for purity verification. But what exactly is a Janoshik COA, what does it tell you, and how do you verify that one is legitimate?

This guide walks through everything you need to know.

What Is Janoshik Analytical?

Janoshik Analytical is an independent third-party testing laboratory that specializes in analyzing peptides, research chemicals, and pharmaceutical compounds. They are not affiliated with any peptide supplier — their business is testing compounds submitted by vendors and providing objective analytical results.

The key word is "independent." When a peptide supplier sends their products to Janoshik for testing, the results are generated by Janoshik's equipment and processes, not by the supplier. This independence is what makes Janoshik COAs meaningful — they can't be manipulated by the vendor.

What's on a Janoshik COA?

A standard Janoshik Certificate of Analysis contains several key pieces of information.

HPLC Purity Percentage: High-Performance Liquid Chromatography (HPLC) is the standard method for measuring peptide purity. The HPLC result shows what percentage of the sample is the target compound versus impurities. For research-grade peptides, you want to see 98% or higher. Durham Peptides products consistently test at 99%+ purity.

Mass Spectrometry (MS) Identity Confirmation: Mass spectrometry measures the molecular weight of the compound. This confirms that the sample is actually the peptide it claims to be — not a different compound or a degraded product. The measured molecular weight should match the expected molecular weight for the specific peptide.

Sample Information: The COA will identify the compound name, the batch or lot number, and the date of analysis.

Verification Key: This is the most important feature. Every Janoshik COA includes a unique alphanumeric verification key that can be independently checked on Janoshik's website.

How to Verify a COA — Step by Step

Step 1: Request the COA from your supplier. Any legitimate supplier will provide this without hesitation. If a supplier refuses to share COAs or says they're "proprietary," that's a major red flag.

Step 2: Look for the verification key on the COA. It's typically a string of letters and numbers, sometimes displayed as a URL or a code at the bottom of the document.

Step 3: Go to Janoshik's verification page. Visit the Janoshik website and navigate to their test verification section.

Step 4: Enter the verification key. The system will either confirm the COA is legitimate and display the matching results, or it will return no results — indicating the COA may be fabricated.

Step 5: Compare the results. Make sure the compound name, purity percentage, and molecular weight on the verification page match what's on the COA document the supplier gave you. If they don't match, the supplier may have altered the document.

Red Flags to Watch For

Not all COAs are created equal. Here's what to watch out for when evaluating peptide suppliers:

No COA available at all. If a supplier can't provide third-party testing results, you have no way to verify what's in the vial. This is the biggest red flag in the peptide industry.

Manufacturer self-testing only. Some suppliers provide COAs generated by their own manufacturer. These are better than nothing, but they lack the independence that makes third-party testing meaningful. The manufacturer has a financial incentive to report favorable results.

COAs without verification keys. A PDF document claiming to be from Janoshik but lacking a verification key cannot be independently confirmed. It could be a template with fabricated numbers.

Mismatched dates or batch numbers. If the COA date doesn't align with when the product was manufactured or purchased, it may be from a different batch entirely.

Generic COAs used across multiple products. Some suppliers use a single COA for their entire product line rather than testing each compound individually. Each compound should have its own COA with its own test results.

Why This Matters

Peptide purity directly affects research outcomes. A compound that tests at 95% purity has 5% impurities that could interfere with experimental results. A compound that tests at 99.5% purity has minimal contaminants. For researchers running controlled experiments, this difference matters.

Beyond purity, identity confirmation through mass spectrometry ensures you're actually working with the compound you think you are. Mislabeled or degraded peptides can invalidate entire research programs.

Durham Peptides' Approach

Every product sold by Durham Peptides is tested by Janoshik Analytical. Every COA includes a verification key that can be independently checked. COAs are available upon request for any product — email info@durhampeptides.ca or visit the Lab Results page for more information on the verification process.

Selected References

• Janoshik Analytical: https://janoshik.com

• Durham Peptides Lab Results: https://www.durhampeptides.ca/lab-results

All products mentioned in this article are sold by Durham Peptides for research and laboratory use only. They are not intended for human or animal consumption, diagnosis, treatment, cure, or prevention of any disease.