Third-party tested, published in the open.

Tested by Janoshik Analytical, an independent analytical laboratory.

What a certificate says

The three things a peptide COA measures

The certificates published here report two things about one lot: HPLC area percent for chromatographic purity, and the measured amount of peptide in the tested vial against the labeled quantity. A fuller certificate can add mass-spectrometry identity; these do not, so they speak to purity and quantity rather than to molecular identity. Any additional assay — endotoxin, water content, counterion — is lot-specific.

Published purity ledger

Every purity figure we publish, with the lot it came from

The table below lists every compound in the catalogue whose current lot has a third-party HPLC certificate on file. HPLC purity is stated to the lab's own precision — 99.882% is a Janoshik area-percent for that specific Selank lot, not a marketing rounding of "99%+". Every row links to the certificate PDF and to the product page it was measured on.

Certificates are lot-specific. When a lot changes, the row above updates on our next catalogue refresh. All results are HPLC area percent by Janoshik Analytical; each certificate also records the measured amount in the tested vial and carries a key checkable at janoshik.com/verify.

Honest limits

Where we do not publish a certificate

Not every SKU has a public HPLC certificate. Of 19 active products, 14 have one on file today. The remainder split into two honest categories: USP-graded reagents whose specification is set by the pharmacopoeia rather than by HPLC area percent, and peptides where the current lot's certificate is pending. Both are stated here rather than papered over.

Verify it yourself

How to check a certificate against the lab that issued it

Every certificate above is issued by Janoshik Analytical, an independent third-party analytical laboratory in Prague, Czech Republic. Janoshik publishes a certificate verification page on its own site; copy the identifier from the PDF into their form and the lab confirms whether the document was actually issued by them, cutting the seller out of that check entirely.

Note on accreditation: Janoshik operates as an independent commercial analytical laboratory. We do not publish an ISO 17025 accreditation certificate on the lab's behalf and will not assert one here — the verifiable claim is the independent third-party HPLC result on each certificate, corroborable directly with the lab using the certificate's own key.

Related explainers

Dig deeper into peptide testing

Longer-form methodology posts from our research blog on HPLC purity, mass-spec identity, third-party testing, and how to read a Certificate of Analysis.

• How to Read a Peptide COA — and Spot a Fake One
• What Does 99% Purity Mean? Reading the HPLC Chromatogram
• What Mass Spectrometry Confirms That HPLC Can't
• Mass Spectrometry Peptides: Methods and Workflows for Researchers
• Net Content Labeled vs. Actual Mass on a Peptide Vial
• Research Peptide Companies Ranked by Testing Transparency
• Where to Buy Research Peptides: A Sourcing Checklist
• Peptide Endotoxin Testing: Assay Choice & COA Guide

See what other researchers say about handling and reconstitution in our peer feedback archive.

Verification, answered

What the testing actually proves

Plain-language answers to what HPLC and mass spectrometry measure, how to read a Certificate of Analysis, and what “third-party tested” does — and does not — mean.