Buyers of research peptides lean on third-party certificates of analysis (COAs) to check identity and purity. Research peptides are sold for laboratory use only and are not approved for human consumption. Three labs show up most often in community COA threads and vendor testing disclosures: Janoshik (Czech Republic), MZ Biolabs (United States), and Vanguard Laboratory (United States). What follows is what's publicly known about each, with their analytical methods, accreditation status, and how to verify results. Every external fact below is attributed to the source we relied on.
Lab Profiles at a Glance
Janoshik is a Prague-based analytical laboratory (Czech Republic), and one of the most cited sources of peptide COAs in the research-peptide community. According to the lab's own materials, Janoshik offers HPLC purity analysis and mass spectrometry (MS) for identity confirmation. Results are posted to a publicly searchable database, the lab's public portal at public.janoshik.com. Anyone can enter a report or test number and confirm that a COA was genuinely issued by the lab, which works as an anti-fraud check. Janoshik is not ISO/IEC 17025 accredited. It operates as a commercial testing service rather than an accredited quality-system laboratory. Independent aggregators including Vialaudit note that this is the most common criticism of the lab, alongside limited published methodology.
MZ Biolabs is a US-based contract analytical laboratory in Tucson, Arizona, serving both the pharmaceutical and research sectors. Per the lab's own site, it uses HPLC with UV detection combined with mass spectrometry. MZ Biolabs is not listed as ISO/IEC 17025 accredited. It is a DEA-registered (Schedule III) facility, a distinction the aggregator Peptigrity notes is held by few peptide testing labs. The lab appears on vendor COAs across multiple research-chemical communities. We did not find a public report-number lookup tool for MZ Biolabs; buyers should request the underlying report directly.
Vanguard Laboratory (Olympia, Washington) holds ISO/IEC 17025:2017 accreditation through A2LA (the American Association for Laboratory Accreditation), the international standard for testing and calibration laboratory competence. Accreditation under 17025 means the lab's quality management system, method validation, and personnel competence have been assessed by an independent accreditation body. Per the lab's own materials, Vanguard offers HPLC purity and identity testing with methods validated to USP <1225>, and is referenced on a smaller but growing number of vendor COAs. Its accreditation scope can be confirmed through A2LA. (Note: "Vanguard Laboratory" here is the peptide/pharma testing lab, not the similarly named companies in other industries.)
Methods Compared
All three labs use high-performance liquid chromatography (HPLC) as the primary method for purity quantification, and mass spectrometry (MS) or LC-MS to confirm molecular identity. These are the standard analytical approaches for peptide characterization in research and pharmaceutical work. A COA that includes both a purity percentage (from HPLC) and a confirmed molecular weight (from MS) tells you more than one that reports purity alone.
| Lab | Location | Primary Methods | ISO 17025 Accredited | Public Result Verification |
|---|---|---|---|---|
| Janoshik | Prague, Czech Republic | HPLC, MS | No | Yes (report/test number lookup) |
| MZ Biolabs | Tucson, Arizona, US | HPLC, MS | No (DEA Schedule III registered) | None found publicly |
| Vanguard Laboratory | Olympia, Washington, US | HPLC (per lab; USP <1225>) | Yes (A2LA, ISO/IEC 17025:2017) | Via accreditation body |
Accreditation and What It Means
ISO/IEC 17025 accreditation is the benchmark recognized by regulatory bodies and quality-focused buyers. A lab has to demonstrate documented procedures, method validation, proficiency testing participation, and regular third-party audits. Accreditation does not guarantee that any individual result is correct. It does indicate that the lab operates within a verified quality framework.
The absence of 17025 accreditation, as with Janoshik and MZ Biolabs, does not automatically mean results are unreliable. Janoshik's public verification lookup is a transparency feature that accredited labs do not always offer, and MZ Biolabs' DEA registration reflects a different regulatory pathway. Community aggregators such as Finnrick and Peptigrity compile COA data across vendors and labs, which lets you cross-reference results over time.
The right lab depends on why you're testing. For internal research documentation, any reputable HPLC/MS service may suffice. For contexts that need audit-ready records or regulatory alignment, an accredited laboratory with a documented scope of accreditation is the appropriate choice. None of this constitutes medical advice, and the presence of a COA does not make any peptide safe or approved for human use.
Sources
- finnrick.com — aggregated vendor COA and lab data
- janoshik.com — lab services and public result verification
- peptigrity.com — independent peptide testing aggregator (MZ Biolabs profile)
- vialaudit.com — vendor and lab rating database
- vanguardlaboratory.com — ISO/IEC 17025:2017 accreditation and peptide testing scope
- usp.org — United States Pharmacopeia; reference standards for analytical method context