What Is Janoshik Analytical?
Janoshik Analytical is one of the most widely cited third-party testing labs in the US research peptide market. Here is what they do and how to verify a Janoshik COA.
Janoshik Analytical is a peptide testing laboratory based in the Czech Republic and one of the most widely cited third-party testing labs among US research peptide vendors. Many vendors in our directory cite Janoshik as a testing lab, and Janoshik COAs are among the most commonly encountered in this market.
What Janoshik tests
Janoshik reports purity and content quantification (mg per vial). The lab-hosted reports we read on 22 October 2026 state no identity method, which is why it is graded partial on our identity check (L4). They typically run multi-vial assessments where two or more vials from the same batch are tested separately, with results reported as paired values like '99.040% / 99.120%' indicating two replicate measurements.
Janoshik verification portal
Every legitimate Janoshik COA carries a unique verification key (typically a 12-character alphanumeric string). The key can be entered at janoshik.com/verify to confirm the COA was actually issued by Janoshik. If a vendor displays a Janoshik COA without a verification key, the document cannot be authenticated and should be treated with caution.
Strengths and limits
Strengths: high test volume, low cost per test, fast turnaround, and verifiable public portal. Limits: typically does not include endotoxin (USP 85) or sterility (USP 71) testing as standard; lab is not ISO/IEC 17025 accredited; geographic location (Czech Republic) means physical samples must be shipped.
Vendors using Janoshik
US vendors whose published certificates name Janoshik include Amino Amigos, Apollo Peptide Sciences, Paramount Peptides, Nextday Peptides, Prime Peptides, Honest Peptide, Swiss Chems and Profound Aminos. See our lab directory for the full list.
Frequently Asked Questions
Is Janoshik a real lab?
Yes. Janoshik Analytical is an established peptide testing service used by dozens of vendors in the US, EU, and global markets. They maintain a public verification portal at janoshik.com/verify.
How do I verify a Janoshik COA?
Find the 12-character verification key on the COA (typically near the bottom or in a designated 'verification' field). Visit janoshik.com/verify and enter the key. The site will confirm whether the COA was issued by Janoshik and display the test results.
Are Janoshik COAs as good as ISO/IEC 17025 accredited COAs?
Janoshik COAs are not ISO/IEC 17025 accredited. However, the public verification portal, paired multi-vial testing pattern, and high vendor adoption make Janoshik a credible testing partner. For maximum confidence, look for vendors that pair Janoshik purity testing with separate endotoxin and sterility testing from another lab.