Third-party peptide testing, explained
Which outside labs peptide vendors name (Janoshik, Vanguard, Freedom Diagnostics, Chromate and more), what their tests show and what they cannot prove.
Key takeaways
- Vendors in our directory name at least nine different outside labs; Vanguard Laboratory and Freedom Diagnostics are named most often.
- A third-party report covers one sample from one batch on one date.
- HPLC estimates purity; mass spectrometry confirms identity; neither detects endotoxin unless that test is run separately.
Research-peptide sellers often point to “third-party tested” products. Here is what that means and what to look for.
Which labs vendors name
We read every vendor’s own pages and recorded the outside labs they name. The full, current table is on the testing labs page: Vanguard Laboratory and Freedom Diagnostics are each named by five vendors; Janoshik, Kovera and Chromate by three each; BioRegen, Mistral Diagnostics, TrustPointe and MZ Biolabs by one or two.
What the tests show
- HPLC (high-performance liquid chromatography) separates a sample’s components and estimates purity as the main peak’s share.
- Mass spectrometry confirms the molecule’s mass, i.e. that it is the compound on the label.
- Endotoxin (LAL) and sterility tests are separate. If they are not on the report, they were not done.
FDA’s own concerns about compounded peptides such as BPC-157 include “peptide-related impurities” and immunogenicity — issues a purity percentage alone does not settle.
What a report cannot prove
One report covers one sample, from one batch, on one date. It does not prove that the vial you receive came from that batch, and it is not an FDA review. Use the COA checklist, then check the seller’s facts in the vendor directory and FDA warning letters.
What the evidence does not show
- That any named lab has endorsed a vendor, or that we have verified individual reports.
Frequently asked questions
What is Janoshik?
Janoshik is an independent analytical lab often used by the research-peptide community; vendors and buyers send it samples for purity and identity testing. Three vendors in our directory name it on their own pages.
Does a COA prove a peptide is safe?
No. A COA reports specific tests on one sample. It does not show sterility, endotoxin levels or safety in humans unless those tests are listed, and research peptides are not approved drugs.
How do I verify a COA?
Check that the batch or lot number matches your vial, that the lab is named, that the date is recent and that the method is stated. Some labs let you verify a report on their own website.
Sources
Find a clinic
Our clinic directory lists only clinics whose address and services we confirmed on their own websites, with the date we checked.