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Reference Guide

Peptide Testing Labs
and ISO/IEC 17025 Status

ISO/IEC 17025 is the international standard for the technical competence of testing laboratories. A lab that truly holds it has been assessed by an independent accreditation body. That is different from a lab simply stating it on its own website.

This guide sorts common peptide testing labs into two groups. The first group publishes an ISO/IEC 17025 accreditation claim. The second group could not be verified from the sources reviewed.

Read the second group carefully. A lab appearing there is not proven to lack accreditation. It means the claim was not confirmed, or the lab describes its system as aligned with the standard rather than accredited to it. The difference matters.

Showing all 29 labs

Publishes an ISO/IEC 17025 accreditation claim
Accreditation not verified

Eight things a lab can test

A purity percentage answers one question out of eight. Most standard tests cover the first three. The rest are separate tests, priced separately, and each one answers something the others cannot.

01 Identity Is the molecule in the vial the peptide it claims to be? Mass spectrometry
02 Purity What share of the material is the peptide itself, not byproducts or impurities? HPLC
03 Quantity How many milligrams of peptide are actually in the vial? A 99 percent pure vial can still be underfilled. Assay, also called net peptide content
04 Endotoxin Did toxic residue from dead bacteria survive manufacturing? Nothing has to be alive for this to be a problem. LAL testing
05 Sterility Is anything living in the vial, like bacteria or fungus? Culture testing, usually a separate sample
06 Heavy metals Are arsenic, lead, mercury, or cadmium present above trace thresholds? ICP-MS
07 Water content How much residual moisture is in the powder? Excess water speeds up degradation. Karl Fischer titration
08 Aggregates Have peptide molecules clumped together? This matters most for GLP-1s, which are prone to it. SEC-HPLC

A standard test usually bundles identity, purity, and quantity. The other five are add-ons, often need their own sample vial, and not every lab offers all of them. Check the lab's test menu before you ship.

What testing actually costs

Prices vary by lab and by peptide. These ranges reflect published price lists from labs with public pricing, so you know what a fair quote looks like before you ask for one.

Standard single peptide Purity and identity testing for common peptides like BPC-157, TB-500, or ipamorelin $125 to $250
GLP-1 peptides Most labs charge more for semaglutide, tirzepatide, and retatrutide due to complexity, though a few price them like standard peptides $125 to $450
Blends Two or more active components, priced by what is in the vial $175 to $800
Add-on tests Endotoxin, sterility, heavy metals, or water content, each priced separately $25 to $300 each
Turnaround Ranges from 24 hours to 10 business days depending on the lab, with rush options at a premium 1 to 10 days

Starting prices shown next to each lab above are for a standard single-peptide test where the lab publishes pricing. Ranges and prices compiled from public lab price lists as of August and September 2026. Prices change. Confirm the current cost, sample requirements, and turnaround directly with the lab before you ship anything.

How to verify for yourself

An accreditation claim on a website is a starting point, not proof. Before relying on it, confirm the certificate number on the accrediting body's public registry, such as A2LA, ANAB, PJLA, or an international equivalent.

Then check the scope of that accreditation. A lab can be accredited for one type of testing and not for peptide purity or identity analysis. Scope matters as much as the certificate itself.

You can also check the report itself. Every COA lists the lab that ran the test. Go to that lab's website and look for a Verify or COA lookup option, then follow their steps to pull up the report and confirm it is real.

Go a little deeper

If you want to understand peptides with more clarity and confidence, here is where to start.

Peptide education and a free dosage calculator My peptide education site, built to make this simpler to navigate Visit pep.drjohnna.co
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