For Research Use Only. Not for human consumption. This guide profiles independent analytical laboratories the research-peptide community uses to verify Certificates of Analysis. It does not address dosing, administration, or recommendations for use.
Why Independent Verification Matters
Any supplier can print a purity number on a label. What separates a verifiable claim from an assertion is whether that number was produced by a laboratory with no financial stake in the sale — and whether a researcher can trace the result back to that lab’s own methodology. Over the past several years, a small number of independent labs have become reference points the research-peptide community turns to for third-party testing, either because a vendor commissions them directly or because a researcher sends in their own sample. This guide profiles four of the most frequently referenced: Janoshik Analytical, MZ Biolabs, Colmaric Analyticals, and Finnrick.
These four operate differently, and understanding those differences matters more than treating “independently tested” as a single, interchangeable stamp of approval.
Janoshik Analytical
Janoshik Analytical is based in the Czech Republic and accepts samples from anywhere in the world (Janoshik). It is one of the most widely referenced labs in English-speaking research-peptide circles, offering purity and composition analysis for peptides alongside testing for anabolic compounds, SARMs, and SERMs. Its published service list includes contamination screening by LC-MS and GC-MS, heavy-metals screening (arsenic, cadmium, lead, mercury), endotoxin analysis, and sterility testing (Janoshik Services). Janoshik states that every report in its system can be checked using the report’s own verification tool, so a COA claiming to come from Janoshik can be checked against the lab’s own record rather than taken at face value. Janoshik does not publish a stated ISO/IEC 17025 accreditation.
MZ Biolabs
MZ Biolabs operates out of Tucson, Arizona, and identifies itself as a U.S. DEA Schedule III licensed facility (MZ Biolabs). Its core method is HPLC with UV detection combined with mass spectrometry, applied to raw powders as well as compounds formulated into liquids, tablets, and capsules. MZ Biolabs is explicit about the boundaries of its purity testing: it states plainly that its standard purity analysis does not cover biological activity, sterility, endotoxins, heavy metals, or pH. That is a useful disclosure rather than a weakness — a researcher comparing COAs should know exactly which questions a given report answers, and which ones it does not. MZ Biolabs does not publish a stated ISO/IEC 17025 accreditation for its peptide testing.
Colmaric Analyticals
Colmaric Analyticals is a contract research organization in St. Petersburg, Florida, that predates the research-peptide market — its core business is analytical testing for the dietary supplement, cosmetic, food, and pharmaceutical industries, using HPLC and USP compendial methods (Colmaric Analyticals). Multiple independent directories list Colmaric as holding ISO/IEC 17025:2017 accreditation through Perry Johnson Laboratory Accreditation (PJLA), certificate number 86258 (ContractLaboratory.com). ISO/IEC 17025 is the standard accreditation bodies use to certify that a lab has demonstrated competence for a defined scope of methods (PJLA). The honest caveat: accreditation under this standard applies only to the specific methods listed on a lab’s accreditation scope document, and at least one independent industry review was unable to confirm that Colmaric’s accredited scope specifically names peptide purity or identity testing (Pep Evolution). A real accreditation number is worth more than a marketing claim — but it is worth checking what that accreditation actually covers before assuming it applies to the exact test on your COA.
Finnrick
Finnrick is structured differently from the other three. It is not itself a single analytical lab — it is a public testing and ranking platform that partners with several independent laboratories, including Krause Analytical, BTLabs, Freedom Diagnostics, Janoshik, and MZ Biolabs, to test peptide samples submitted by members of the public (Finnrick Partner Labs). U.S. residents can submit samples of select peptides for free identity, purity, and quantity testing, and Finnrick aggregates the results into public vendor safety rankings and leaderboards, reporting figures like total tests run and per-vendor pricing and ratings (Finnrick). Rather than certifying any one lab as a ground truth, Finnrick’s stated approach is to compare overlapping results across its partner labs and flag when a given lab’s reported values run systematically high or low relative to the others. That makes Finnrick less a substitute for reading a single COA carefully and more a second, population-level layer: useful for spotting patterns across many vendors, though its individual partner labs vary in their own published methodology and accreditation status.
Side-by-Side Comparison
| Lab | Location | Model | Stated Accreditation | Core Methods |
|---|---|---|---|---|
| Janoshik Analytical | Czech Republic | Commissioned testing, global samples | None stated | LC-MS/GC-MS screening, heavy metals, endotoxin, sterility |
| MZ Biolabs | Tucson, AZ, USA | Commissioned testing | DEA Schedule III licensed facility; no stated ISO 17025 | HPLC-UV + mass spectrometry |
| Colmaric Analyticals | St. Petersburg, FL, USA | Commissioned testing (generalist CRO) | ISO/IEC 17025:2017 via PJLA (#86258); peptide-specific scope unconfirmed | HPLC, USP compendial methods |
| Finnrick | USA (platform) | Free public testing + aggregated vendor rankings | Varies by partner lab | Partners with Janoshik, MZ Biolabs, and others |
Using These Labs to Check a COA
Whichever lab issued a COA, the same checks apply: does the lot number on the document match your physical label, is there a test date, was the purity figure produced by a named method, and — where a mass-spec identity check exists — does the reported molecular weight match the compound’s known mass? For a deeper walkthrough of reading the analytical sections of a COA itself, see our guide on how to read a peptide Certificate of Analysis. Every product listed on Ascenyx Bio includes a COA on its product page, organized by lot number, so you can run these same checks against our own documentation. See our Quality & Testing page for our full standards, or browse the COA Library directly.
A Note on Regulatory Status
All compounds referenced on this page are sold strictly as Research Use Only (RUO) materials. They are not approved by the FDA as drugs, biologics, dietary supplements, or medical devices, and are not intended for diagnostic, therapeutic, cosmetic, or any human or animal use. This guide is limited to explaining how independent analytical labs verify documentation; it does not address dosing, administration, or any question tied to human or animal use. Researchers with questions along those lines should direct them to a qualified institutional or medical professional, not a vendor content page.