About Us
About Peptide.Express
Peptide.Express is a United States–based supplier of research peptides for in-vitro laboratory study. We exist to do one thing well: deliver compounds whose purity and identity are independently verified and fully documented, so the researchers who buy from us can trust what is in the vial.
In short
Peptide.Express supplies research-grade peptides verified to ≥99% purity by HPLC, confirmed by mass spectrometry, and tested by an independent third-party laboratory. A batch-specific Certificate of Analysis ships with every order. All products are for laboratory research use only — no human or therapeutic use.
How we verify what we sell
Quality control is the entire business, not a marketing line. Every batch moves through the same documented pipeline before it reaches a product page:
- 1
Sourcing & supplier qualification
Compounds are sourced from manufacturing partners that synthesize to research-grade specifications. Each lot is treated as unverified until it clears our independent testing — supplier certificates are a starting point, never the final word.
- 2
HPLC purity verification (≥99%)
Every batch is analyzed by high-performance liquid chromatography (HPLC) to confirm ≥99% purity before it is listed for sale. The chromatogram and purity figure are recorded against the batch ID.
- 3
Mass-spec identity confirmation
Liquid chromatography–mass spectrometry (LC-MS) confirms that the measured molecular weight matches the expected mass for the named compound, guarding against mislabeled or substituted material.
- 4
Independent third-party testing
Verification is performed by an independent third-party laboratory, not just in-house, so the purity and identity data on the Certificate of Analysis are arms-length.
- 5
Certificate of Analysis with every order
Each shipment includes a batch-specific Certificate of Analysis (CoA) documenting purity, identity, and methodology, so any result can be traced back to the exact lot used in a study.
See the full methodology on our Quality & Purity Standards page, or browse batch certificates in the Lab Results library.
Our research team
Content and product documentation on Peptide.Express is maintained by the Peptide.Express Research Team — staff with working backgrounds in peptide chemistry, HPLC purity analysis, and analytical method validation. The team reviews molecular data, verifies that cited literature studies the named compound, and keeps entity facts (formula, molecular weight, CAS, sequence) consistent across the site. Research articles are attributed to this team and written strictly within a research-use framing.
What we hold ourselves to
Research use only
Everything we supply is for in-vitro laboratory and research use only. We make no human, clinical, therapeutic, or dosing claims. This is a compliance requirement and a standard we hold ourselves to in every page we publish.
Entity-accurate documentation
Molecular formula, molecular weight, CAS number, and sequence are drawn from a single canonical reference and kept consistent across product pages, comparisons, and research articles. Where a value is genuinely uncertain, we leave it out rather than guess.
Citations that study the named compound
Research content references peer-reviewed literature (PubMed/NIH) that actually investigates the compound in question — never borrowed citations or fabricated studies.
Explore the catalog
Every compound page carries its specifications, Certificate of Analysis, and the research areas it is studied in.