Neutral explainer of the labs named on peptide supplier COAs (Janoshik, Vanguard, MZ Biolabs, Freedom Diagnostics, Ethos, Kovera): what a name proves.
Open the certificate library of almost any research peptide supplier and you will meet the same handful of laboratory names. Suppliers lean on those names as proof of testing, and buyers tend to accept them, because a lab name sounds like an endorsement. It is not one. This explainer sets out what a lab name on a certificate actually tells you, which labs appear most often in the supplier records we maintain, how to verify a report with the lab that supposedly issued it, and how to check an accreditation claim. We do not rank laboratories and we state only what is publicly stated.
What a lab name on a certificate establishes
A certificate of analysis is a document the supplier publishes. The lab name printed on it is the supplier’s statement that this laboratory received a sample and produced this report. Three things follow.
First, the name is a claim until the lab confirms it. Letterhead can be copied. Our data set includes a closed supplier whose owner, according to court records cited in the vendor record, admitted forging certificates while advertising third-party testing. The lab names on forged certificates are real labs; the reports are not.
Second, the lab tests the sample it receives. It does not select the sample, witness the lot being made, or confirm that the sample represents what ships. A genuine report tells you what was in the vial that reached the lab on that date.
Third, the lab’s methods define what the report can say. A report that lists an HPLC purity figure and nothing else has not established identity. A report listing mass spectrometry but no purity method has not established how much of the material is the stated peptide. Our guide to mass spectrometry versus HPLC covers that distinction.
Laboratories named in our supplier records
The table below lists the laboratory names that appear in the labs_named field across the 62 supplier records in our data set as of October 2026. The count is the number of supplier records naming that lab; it measures how often suppliers cite the lab, not how many tests the lab ran or how good they are.
| Name as it appears on certificates | Supplier records naming it | Notes from the records |
|---|---|---|
| MZ Biolabs | 6 | Most frequently cited single name |
| Janoshik Analytical (also written “Janoshik” and “Janoshik Laboratory”) | 6 combined | Same lab, three spellings; the lab publishes a report-lookup function on its own site |
| Freedom Diagnostics | 5 | Cited by several US suppliers |
| Vanguard Laboratory | 4 | Cited by several US suppliers |
| Kovera Labs | 2, plus one record where the “COA link” redirected | A redirecting certificate link is a flag we note |
| Ethos Analytics | 1 | Single record |
| Others (SafeCert Labs, BioRegen, AV Analytics, Chromate) | 1 each | Single records |
| Not a laboratory: a certificate-hosting platform and a testing aggregator each appeared once in the “lab” slot | 1 each | A host or aggregator republishes results; it did not run the test |
Two patterns in that table matter more than the counts. The inconsistent spelling of one lab across supplier sites shows that the name on a certificate is typed by the supplier, not standardized by anyone. And two of the “labs” named were not labs at all, which is the clearest demonstration that a name in the lab field is only as reliable as the supplier who put it there.
What each lab publicly states, and what to look for
We do not publish a profile of each laboratory’s internal quality system, because we cannot verify it. What we can do is tell you which public facts to collect from a lab’s own website before you rely on its name.
Location and legal identity
A laboratory should state where it is and what legal entity operates it. Check that the address is a laboratory premises and not a mailbox, and that the entity name matches the one on the certificate footer. Janoshik Analytical, for example, states on its site that it operates from the Czech Republic. For the others, take the location from the lab’s own site, not from a supplier’s description of it.
Methods offered
Labs list the methods they run: HPLC for purity, mass spectrometry for identity, and sometimes endotoxin, sterility, water content or heavy metals. If a supplier’s certificate shows a method the lab does not list, that is a mismatch worth asking about.
Report verification
The most useful public fact about a lab is whether it lets anyone confirm a report. The forms this takes:
- A lookup page on the lab’s own domain where you enter the report number, sometimes with a second code printed on the certificate.
- A QR code on the certificate that resolves to the lab’s domain, not the supplier’s.
- An email address for verification requests.
Janoshik Analytical is the lab in our records that most clearly publishes a self-serve lookup. For the others, check their sites directly; verification routes change, and we would rather you confirm the current one than rely on a snapshot.
Client confidentiality policies
Some labs will confirm that a report number exists and matches a product and date, but will not name the client. That is normal. A confirmation that the report is real and matches the product shown is enough to support a certificate; the lab does not have to tell you who ordered it.
Checking an accreditation claim
Suppliers and labs sometimes write “ISO 17025 accredited” or “ISO certified lab.” These are checkable statements, and the check is simple.
ISO/IEC 17025 is the standard for testing and calibration laboratories. A lab does not accredit itself. An accreditation body assesses it and lists it in a public directory with a certificate number and a scope that names the tests covered. In the United States the main bodies are A2LA, ANAB and PJLA; internationally, bodies that are signatories to the ILAC Mutual Recognition Arrangement maintain similar directories.
To check a claim:
- Find the accreditation body and certificate number. If the lab or supplier does not give one, the claim cannot be checked and we record it as unverified.
- Search the body’s directory for the lab’s legal name.
- Read the scope. Accreditation for one method does not cover another. A lab accredited for water testing is not thereby accredited for peptide purity.
- Check the status and expiry. Accreditations lapse and are suspended.
A phrase like “ISO 17025 partner lab” without a name, as one supplier record in our data set shows, is a marketing statement, not an accreditation. We flag it as such.
How we use lab names in grading
Our testing factor gives credit for a public certificate library, for named laboratories whose domain resolves to a real lab, and for certificates that carry report numbers that can be checked. It gives no credit for a lab name alone, and it does not weight one lab above another. Where a supplier names a lab but publishes no certificates, or publishes certificates that name a host or aggregator as the issuer, the report says so in plain words.
If you want to see which suppliers publish checkable certificates, our public COA list ranks suppliers, not labs, on that single criterion. The lab name is where verification starts. It is never where it ends.