Before I order peptides, which suppliers’ lab reports can I verify myself?

Modern Aminos (27 certificates, Freedom Diagnostics Testing); Origin Labs (24 certificates, Freedom Diagnostics Testing); Bench Grade Peptides (24 certificates, Freedom Diagnostics Testing); Hydro Research Peptides (4 certificates, Janoshik Analytical); PeptidePlugs (103 certificates, Freedom Diagnostics Testing). Each publishes certificates signed by a laboratory that runs a public lookup, so the report can be pulled from the laboratory rather than taken from the vendor's own website.

How do I know a peptide COA is not fake?

Do not judge the document by how it looks. Check three things: the laboratory named on it is not the vendor, the lot number matches the vial you were sent, and the assayed mass is printed against the labelled mass rather than purity alone. Then look the report up on the laboratory’s own system if it offers one. A certificate that only exists as an image on the vendor’s site has not been confirmed by anyone.

Which peptide testing laboratories have a public lookup?

Freedom Diagnostics Testing (299 certificates indexed here) and Janoshik Analytical (5 certificates indexed here). Certificates from other laboratories can be read but not independently re-pulled, which is a weaker position even when the laboratory is genuine.

Does a laboratory lookup prove the vial I received is good?

No. It proves a report exists at the laboratory and says what it says, for the sample the laboratory received. Linking that to your vial depends on the lot number matching. That is why the lot number on the vial, rather than the certificate on the product page, is the thing to check first.

Buying guide

Vendors whose lab reports you can check yourself

14 of the 57 vendors indexed here publish certificates signed by a laboratory that runs its own public lookup, which means you can pull the report from the laboratory instead of trusting the copy on the vendor's site. That covers 304 certificates across 2 laboratories. Every lot below links to the document and to the lookup that will confirm it.

14 vendors · 304 independently checkable certificates · updated 18 Sept 2026

The shortlist

#	Vendor	Score	Checkable certificates	Laboratory	Newest assay	Visit
1	Modern Aminos	88.1	27	Freedom Diagnostics Testing	21 Jul 2026	Site
2	Origin Labs	87.7	24	Freedom Diagnostics Testing	18 Sept 2026	Site
3	Bench Grade Peptides	86.8	24	Freedom Diagnostics Testing	10 Jul 2026	Site
4	Hydro Research Peptides	86.5	4	Janoshik Analytical	17 Mar 2026	Site
5	PeptidePlugs	86.3	103	Freedom Diagnostics Testing	26 Aug 2026	Site
6	Simple Peptide	84.9	29	Freedom Diagnostics Testing	17 Sept 2026	Site
7	ZC Labs	83.2	39	Freedom Diagnostics Testing	26 Aug 2026	Site
8	Prime Peptides	82.6	3	Freedom Diagnostics Testing	16 Jul 2026	Site

Ordered by overall score, which is computed from a published rubric and never from any commercial arrangement. Inclusion here is narrower than the main ranking: it requires certificates from a laboratory that lets you check them.

How to check one, in five steps

Get the certificate for your exact lot. Read the lot number off the vial, not off the product page. Ask the vendor for the certificate matching that lot if it is not published. A vendor that cannot produce one for the lot it shipped you has failed the only test that matters here.
Check that the laboratory is not the vendor. Find the laboratory name on the certificate. If it is the vendor’s own name, a job title such as "Principal Chemist", or absent entirely, the document is not third-party evidence regardless of how it is presented.
Find the lookup identifier. Laboratories that publish a lookup print an identifier for it. Freedom Diagnostics prints a Search Code in the table at the top right of every report. Janoshik prints a task number and an access key. That identifier, not the vendor’s link, is what proves the report exists at the laboratory.
Pull the report from the laboratory. Enter the identifier on the laboratory’s own site and compare what comes back against the vendor’s copy: purity, assayed mass against labelled mass, and the date. If they disagree, the laboratory is right.
Check the assayed mass, not just the purity. Purity is the share of what is in the vial that is the peptide. It says nothing about how much is there. A vial can assay at 99% purity and still contain a third less peptide than the label claims, so read the assayed mass against the labelled mass every time.

The laboratories that let you check

Freedom Diagnostics Testing — 299 certificates, 12 vendors

Every certificate prints a Search Code in the table at the top right, formed from a short client prefix and the accession number. Enter it in the lab’s own lookup and the report comes back from the laboratory, not from the vendor.

Janoshik Analytical — 5 certificates, 2 vendors

Janoshik reports carry a task number and an access key. Both appear on the certificate and are entered together on the laboratory’s own results page.

Certificates from the other 10 laboratories on record can be read but not re-pulled. That is a weaker position than a lookup, even where the laboratory is entirely genuine, and it is why those vendors are not on the shortlist above.

Where to go next

Every certificate we have read, one page each, with the lot, the laboratory and the document.
The laboratory registry, showing who signed what.
The full ranking, which weighs price and documentation as well as testing.