Research peptides, 6-panel tested every lot
We don't ask you to
take our word for it.
We run six lab tests on every lot and post the full results in our public COA library before anything ships. Check the numbers yourself.
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| Test | Result |
|---|---|
| 01 Identification | Confirmed |
| 02 Purification | 99.2% |
| 03 Conformity | Conforms |
| 04 Sterility | Absent |
| 05 Quantification | Confirmed |
| 06 Endotoxin | ≤ 0.05 EU/mL |
Reported Jun 20, 2026
Culver City, CA
Featured research peptides
The most popular peptides of the last 60 days, third-party tested.
U.S.-made research peptides
This line is synthesized, lyophilized, and finished in U.S. facilities. Every domestic lot passes the same six-panel testing as the rest of the catalog, and we publish its certificate of analysis.
Shop the Made in USA line
Why we run six tests when most vendors run one.
Our methods are validated against pharmaceutical industry acceptance criteria.
Electrospray ionization mass spectrometry. Mass confirmed to ±0.1 Da of theoretical. Multiply charged ion envelope deconvoluted for intact mass.
Molecular identity. Confirms the synthesized peptide matches the intended sequence by mass. Spectrum published in COA.
A peptide can show 99% chromatographic purity and still be the wrong compound. Mass spec is a separate check that confirms molecular identity.
Reversed-phase HPLC with UV detection at 220 nm. Purity by area normalization. Minimum acceptance: ≥98.0%.
Total peptide purity. Identifies co-eluting impurities, incomplete couplings, and degradation products. Chromatogram published with every COA.
HPLC confirms purity but not identity. A mis-synthesized peptide with the wrong sequence can still read ≥99% pure, which is why we also require identification by mass spec.
Visual inspection of the lyophilized cake and container closure, with label and lot reconciliation against the batch record.
Whether what ships matches what was released: correct compound, correct fill, intact vial, and a lot number that traces to the batch record.
Analytical data describes the material that was assayed. Conformity confirms the vial in the box is that same material.
Microbial enumeration and screening for specified organisms per USP <61> / <62>. Membrane filtration with plate count.
Viable bacterial and fungal load. This is separate from endotoxin. A lot can be endotoxin-clean and still carry live organisms introduced after synthesis, during lyophilization or fill.
It needs several days of incubated culture, which delays lot release. HPLC, mass spectrometry, and the LAL assay all miss live organisms.
Acid hydrolysis (6N HCl, 110°C, 24 hrs) followed by chromatographic quantification of amino acid ratios. For peptides >15 residues.
Net peptide content and amino acid composition. Confirms correct residues in expected proportions.
Without it, concentrations are calculated from gross weight, which includes TFA counterions and moisture. Quantification reports the actual peptide fraction, so assay concentrations are accurate.
Limulus amebocyte lysate (LAL) assay per USP <85>. Kinetic turbidimetric method. Acceptance: ≤ 0.05 EU/mL.
Bacterial endotoxin (lipopolysaccharide). It is pyrogenic and can confound inflammatory endpoints in vivo, whatever the peptide's purity.
It needs dedicated instruments and validated depyrogenation. HPLC and mass spectrometry both miss endotoxin.
Tests 4 to 6 need dedicated instruments and culture facilities beyond standard HPLC/MS, and most research peptide vendors leave them out of their standard release panel. We publish every lot's analytical data in its COA, raw spectra and measured values included.
Look up any lot before you buy.
100% COA Coverage. Search by lot number and download the PDF, no account needed.
Search all COAs →Research institutions and lab teams
University labs, CROs, and biotech teams order through us with documentation formatted for institutional procurement review.
- Institutional pricing from 100+ units
- Chemists available for institutional support
- COAs formatted for records management and IRB documentation
Genesis Peptides is based in Culver City, California. Every certificate of analysis can be downloaded without an account and searched by lot number. Each one includes verification data from our third-party testing laboratory. We have operated continuously, with a clean regulatory record.