Do US vendors have to publish COAs?

No. Research reagents are not FDA-regulated products, so no rule compels testing, publication or accuracy. Everything a vendor shows you is voluntary — which is exactly why a published, lab-confirmable certificate separates suppliers so sharply from the rest.

What makes a certificate trustworthy?

Three properties: it is specific to the lot code on your vial, it reports measured content as well as purity, and it exists on the issuing laboratory’s own portal where the vendor cannot edit it. Miss any one of the three and the document is decoration.

How do I verify an Eppix Labs lot?

Type the lot code from the vial into the batch verifier, or find it in the COA library. The batch page carries the full analytical record and the outbound link to the laboratory’s verification entry for that exact test.

Audit Any Vendor

Peptide COA Verification

No US agency audits research peptide vendors, so the auditing falls to the buyer — and it is genuinely doable in about five minutes per product, from any supplier, once you know what a real certificate has to survive. The method below is the one we would want used on us. Use it on us.

The five-minute audit

First, the lot. Find the lot code on the product page (better: on a vial photo or your own vial) and demand a certificate carrying that exact code. A certificate for some other batch — or for no batch — verifies nothing about the material being sold today.

Second, the source. Take the test number off the certificate and look it up on the laboratory’s own website. Janoshik Analytical, the lab we use, runs a public verification portal for exactly this purpose. A PDF on a vendor’s server can be edited in a minute; the record on the lab’s database cannot.

Third, the quantity. Purity and content are different questions. Ask what the vial actually weighed in at against its label. If the certificate doesn’t report measured mass, the vendor chose not to test for it or chose not to publish it — either answer tells you something.

Red flags that end the audit early

One undated "sample COA" covering every batch of a product
A certificate hosted only as an image on the vendor’s site, with no lab-portal record to check it against
Purity reported with no measured mass — the number that catches underfilling is the one missing
A test date that predates the batch it supposedly covers, or is years old
Lab names you cannot find an independent portal for

Run the audit on us

Every published Eppix lot has its own page: purity, measured content, fill accuracy, test date, and the laboratory’s outbound verification link.

Open the batch verifier →Browse the COA library →

Go deeper

Frequently asked questions

Do US vendors have to publish COAs?: No. Research reagents are not FDA-regulated products, so no rule compels testing, publication or accuracy. Everything a vendor shows you is voluntary — which is exactly why a published, lab-confirmable certificate separates suppliers so sharply from the rest.
What makes a certificate trustworthy?: Three properties: it is specific to the lot code on your vial, it reports measured content as well as purity, and it exists on the issuing laboratory’s own portal where the vendor cannot edit it. Miss any one of the three and the document is decoration.
How do I verify an Eppix Labs lot?: Type the lot code from the vial into the batch verifier, or find it in the COA library. The batch page carries the full analytical record and the outbound link to the laboratory’s verification entry for that exact test.