Get Your Peptides Tested

PeptideCensus does not test peptides, but the independent laboratories we index do, and testing is how a vendor earns a place in the rankings.

For vendors

Batches with published third-party results are the only thing our scores count. If your products test well, publishing results is the cheapest marketing you will ever buy: get batches tested at an independent lab, publish the reports, and our index picks them up — or tell us directly.

Labs that test peptides

The laboratories profiled on our data sources page accept commercial and, in several cases, private samples. Widely used starting points:

• Janoshik Analytical — the industry’s most-used independent lab; publicly verifiable reports.
• MZ Biolabs — US, DEA-licensed, HPLC-UV + mass spectrometry.
• Freedom Diagnostics — US, publicly searchable COA database, fast turnaround.

Pricing and turnaround vary by lab and test panel (identity, purity, quantity, sterility, endotoxins); check each lab’s current terms directly.

For researchers

Want to know what is actually in a vial? The same labs accept private samples. A useful habit regardless of lab: test quantity as well as purity: underfilled vials are the failure mode purity-only testing misses.

Disclosure: if PeptideCensus enters referral partnerships with testing laboratories, links on this page will be updated and disclosed accordingly. Referral relationships never influence scores or rankings — results are counted identically whether or not we referred the test.

Common questions

What should a peptide test include?

At minimum: identity (is it the claimed compound), purity (HPLC), and quantity (does the vial hold the labeled milligrams). Sterility and endotoxin testing are add-ons for injectable formats.

How much does peptide testing cost?

It varies by lab and panel, typically from under a hundred dollars for basic identity and purity to more for quantity, sterility, and endotoxin add-ons. Check each lab’s current price list.