Quality & Purity
At Peptide.Express, purity is not a selling point. It is the baseline requirement. Every peptide we supply undergoes strict multi-stage testing before it reaches your lab.
HPLC Verification
Every batch is analyzed using High-Performance Liquid Chromatography (HPLC) to confirm purity levels. We maintain a strict minimum purity threshold of 99% across our entire catalog. Certificates of Analysis are available for every product listing."
Mass Spectrometry (LC-MS/MS)
Liquid Chromatography-Tandem Mass Spectrometry validates the molecular weight, structural identity, and composition of each compound. This ensures what you receive matches the published molecular profile with precision.
US-Based Synthesis
All peptides are synthesized in ISO 9001-certified laboratories within the United States. Domestic production allows us to maintain full chain-of-custody oversight, from raw amino acid sourcing through final lyophilization and packaging.
Endotoxin & Sterility Testing
Select products undergo LAL (Limulus Amebocyte Lysate) endotoxin testing and microbial contamination screening. This additional layer of quality control ensures research-grade sterility for sensitive experimental protocols.
Third-Party Independent Testing
We never rely solely on in-house results. Independent, accredited third-party laboratories verify our purity claims. This eliminates bias and provides you with the confidence that our published specifications are accurate and reproducible.
Certificates of Analysis (COA)
A detailed Certificate of Analysis accompanies every product. Each COA includes HPLC chromatograms, mass spectrometry data, appearance, solubility notes, and storage recommendations so you can integrate our peptides into your research with full transparency.
99%+
Minimum Purity
ISO 9001
Certified Facilities
100%
US Synthesized
Research Use Disclaimer
All products sold by Peptide.Express are intended for laboratory research and educational purposes only. Not for human consumption. By purchasing from Peptide.Express, you confirm that you will use these products solely for legitimate research purposes.