Peptide Testing Labs Named by Vendors
42 of 82 vendors we profile publish a COA or test-results page. This table shows which outside labs vendors name on the pages we read (checked October 19, 2026). Being named by a vendor does not mean the lab endorses it, and we have not verified individual reports.
Labs and the vendors that name them
| Lab | Vendors | Named by |
|---|---|---|
| Freedom Diagnostics | 6 | Ion Peptide, LotusPeptide, Modern Aminos, Peptide.Express, Plum Labs Research, Prime Peptides |
| Kovera | 5 | LotusPeptide, Modern Aminos, Peptide Partners, Plum Labs Research, Pure Peptides |
| Vanguard Laboratory | 5 | Core Peptides, Evolve BioPep, Licensed Peptides, Modern Aminos, Peptidology |
| Janoshik | 3 | Prime Peptides, Pure Lab Peptides, Royal Peptides |
| Chromate | 3 | Evolve BioPep, Modern Aminos, Peptide Partners |
| BioRegen | 2 | BioLongevity Labs, Peptide Partners |
| TrustPointe | 2 | Modern Aminos, Peptide Partners |
| Mistral Diagnostics | 1 | Peptide.Express |
| MZ Biolabs | 1 | San Diego Peptides |
| Ethos Analytics | 1 | Evolve BioPep |
| ILS Labs | 1 | Evolve BioPep |
| SafeCert Labs | 1 | BioLongevity Labs |
| AV Analytics | 1 | BioLongevity Labs |
What each test can and cannot show
| Test | What it measures | What it misses |
|---|---|---|
| HPLC (high-performance liquid chromatography) | Purity: the share of the sample that elutes as the main peak, usually reported as a percentage | Does not confirm the main peak is the right molecule, or how much peptide is in the vial |
| Mass spectrometry (LC-MS, MALDI) | Identity: whether the molecular mass matches the expected sequence | Says little about purity or quantity on its own |
| Quantity / net peptide content | How many mg of peptide the vial actually holds, versus the label claim | Rarely reported; many COAs show purity only |
| Endotoxin (LAL test) | Bacterial endotoxin, which can cause fever and inflammation if injected | Does not prove sterility |
| Sterility | Whether microorganisms grow from the sample | Takes about two weeks; seldom done for research vials |
| Heavy metals / residual solvents | Contaminants from synthesis | Uncommon on research-grade COAs |
A 99% HPLC purity figure is compatible with a vial that holds far less peptide than its label says, so purity and quantity need separate tests. When a vendor publishes COAs, check which of these tests each report actually includes.
Checking a COA yourself
Look for the lab's name, a batch or lot number that matches your vial, the test date, the method (HPLC for purity, mass spectrometry for identity) and, ideally, a way to verify the report on the lab's own site. Guide: how to read a peptide COA. Terms: glossary.