Cathrex Labs exists to provide researchers products they can actually trust — verified purity, transparency, quality without compromise.
Sourcing research peptides used to mean gambling on vague listings, inconsistent purity, and suppliers who went quiet the moment something needed verifying. We started Cathrex Labs to fix that — a single source where every batch is synthesized in-house, tested by an independent lab, and backed by a certificate of analysis you can actually check against the vial in your hand.
Every peptide we list is HPLC- and mass-spec-verified before it's released for sale, not just spot-checked. We publish our COAs rather than emailing them on request, we ship on a predictable schedule, and we keep our catalog small enough that we can stand behind every product in it — instead of listing anything and everything to chase volume.
Cathrex Labs is built for university labs, independent researchers, and biotech teams who need reproducible results and can't afford to second-guess their source material. If that's you, we'd like to earn your repeat business.
Three things guide every decision, from sourcing raw material to shipping the finished vial.
Every batch is tested before it's listed — not after a customer asks.
COAs are public by default. If we can't show our work, we don't ship it.
Consistent batches, predictable dispatch — research shouldn't wait on us.
We're a small team on purpose — every product has someone who owns it.
We don't just say we're rigorous about quality — we prove it.
Anyone can put "high purity" on a label. At Cathrex Labs, we back it up with real, independent testing on every single lot we sell. Here's what that actually looks like behind the scenes:
Using advanced analytical methods, so you know what's in the vial matches what's on the label — every time.
Bacterial endotoxins are something you simply can't see or catch with a purity check alone. It's a separate, essential layer of quality control.
We check for any viable microorganisms that might have slipped through — going a step further than filtration alone can guarantee.
We don't just run the tests — we hand you the receipts. Every batch comes with lot-specific documentation, including endotoxin and sterility results from an independent, ISO/IEC 17025:2017-accredited lab. So instead of taking our word for it, you get real traceability and the data to back it up.
We built it this way because we believe researchers deserve to know exactly what they're working with. That's not an add-on for us — it's just how we do things.
Not marketing claims — every one of these is backed by paperwork we'll hand you.
Browse our verified catalog or reach out directly — we're happy to walk through any COA in detail.