The entire research-peptide market runs on a small number of analytical labs. Vendors send them samples; the labs return Certificates of Analysis; those PDFs become the industry's currency of trust. So it matters enormously which labs are rigorous, which are transparent, and which are being paid by the people they're grading. This is the map, current as of August 2026.
First, the uncomfortable baseline
No lab in this niche has verifiable ISO 17025 accreditation. That's the international standard for testing-lab competence, and if any lab claims it, ask to see the certificate and its scope. In its absence, the credentials that actually distinguish labs are: cross-lab consistency (do their numbers match when the same vial is split between labs?), a public COA-verification portal (can a report be checked on the lab's own site?), and disclosure of methodology, location, and ownership.
The labs
Janoshik Analytical (janoshik.com, Czech Republic) — the longest-running and most-referenced lab in the space. HPLC purity plus MS identity and quantification, public per-test pricing (roughly $145–$500), worldwide sample acceptance, and a public results database at public.janoshik.com where any report can be verified. In blind cross-lab testing its results matched Chromate's across multiple samples — the best consistency evidence available. The knock: it's not accredited and operates semi-anonymously.
MZ Biolabs (mzbiolabs.com, Tucson, AZ) — a real analytical chemistry business that predates the peptide boom, offering HPLC-UV plus mass spec COAs. Refreshingly explicit about what it does not test (activity, sterility, endotoxin, heavy metals, pH). No public pricing — contact directly.
Freedom Diagnostics (freedomdiagnosticstesting.com, Franklin, TN) — founded 2023, now one of the highest-volume US labs with 42,000+ COAs in a public searchable database and a claimed 2–4 day turnaround, the fastest in the space. Every COA pairs HPLC purity with LC-MS identity. Much of its volume is vendor-paid — the reports on this site's COA-verified vendor pages come from here, and each one can be checked in their public database.
Chromate (chromate.org, US) — HPLC and LC-MS with a public batch-verification portal and low-cost positioning. Matched Janoshik in blind cross-lab testing, which is a genuine credential; it has also had a documented misidentification it later corrected, and it's opaque about location and ownership.
Peptide Test (peptidetest.com, US) — a testing front-end whose analysis runs through an unnamed Michigan partner lab. The draw is the widest public menu in the niche: purity and identity ($200–$400 by compound), plus the tests nobody else menus — sterility ($300), endotoxin ($300), heavy metals ($250), water content. The unnamed partner lab is the transparency weak spot.
What about Finnrick?
Finnrick (finnrick.com) isn't a lab — it's a VC-backed aggregator that routes samples to seven partner labs and publishes vendor ratings from ~10,000 tests. It's a useful data source, and its conflict is structural: it charges vendors for premium programs (about $279/month) while rating them, without prominent COI disclosure. Its highest-volume partner lab also read ~15% low versus Janoshik and Chromate in blind cross-testing. Use the data; don't outsource the judgment. (That critique — paid placement corroding neutral rating — is the reason this site's rankings are never for sale.)
How to choose, in four rules
1. Demand purity AND identity on one sample. HPLC purity without MS identity proves almost nothing — the wrong compound can be beautifully pure. Our HPLC vs mass spec explainer covers why. 2. Verify the COA at the lab, not the vendor. A PDF is trivially forged; a report that resolves in the lab's own portal is not. 3. Follow the money. Vendor-paid COAs aren't worthless, but blind-purchased, customer-submitted samples are the gold standard. 4. Distrust perfection. A lab whose every published result is 99%+ is describing its client list, not the market.
For research use only. This article is educational and makes no health, dosing, or usage claims of any kind.