Verified before it lists, not after a complaint.
Every batch is independently assayed by Janoshik before it reaches the catalog — and the original certificate is published so you can check it yourself.
Seven checks on every batch — tested by Janoshik
Reverse-Phase HPLC
Purity quantified against reference standards — Janoshik’s core test, and the headline number on every certificate.
Mass Spectrometry (LC-MS)
Molecular identity confirmed by mass-to-charge analysis — the compound is what the label claims, not a substitute.
TFA Content
Residual trifluoroacetic acid measured — relevant for peptide synthesis byproducts that HPLC purity alone won’t flag.
Endotoxin (LAL)
Bacterial endotoxin levels screened against a defined threshold.
Sterility
Checked separately from purity — a chemically pure batch can still carry bacterial contamination, so it’s tested independently.
Heavy Metals
Trace elemental contaminants screened on request for batches where it matters.
Batch-Level Archival
Each batch carries a unique Lot ID linked to its Janoshik COA — verifiable directly on janoshik.com, exact paperwork for the exact vial.
From synthesis to your bench
Synthesized to spec
Produced to a defined specification and lyophilized to a shelf-stable powder — sealed against light and moisture.
Independently assayed by Janoshik
All our peptides are sample-tested by Janoshik Analytical for HPLC purity and MS identity. We don’t grade our own work.
Certificate published
The COA is available directly on the product page — the original test results from Janoshik.
Sealed & dispatched
Vials from tested batches are sealed and shipped discreetly.
Proof, not promises
A certificate only counts if it holds up to scrutiny. Every TOP Pep COA links back to a batch you can check yourself — nothing here is just taken at our word.
- HPLC purity, benchmarked against reference standards
- Identity confirmed via mass spectrometry & molecular weight
- Tested independently by Janoshik — we don’t mark our own homework
