US Peptide Science is a domestic research peptide supplier committed to purity, transparency, and reproducibility. Every compound ships with a third-party Certificate of Analysis and meets our ≥98% HPLC purity standard.
What separates a reliable research peptide supplier from the rest is process rigor and documentation transparency. Here is what we verify for every batch.
Every batch is independently tested by accredited US laboratories. Certificate of Analysis (COA) available for every product — verifying identity, purity, and absence of contaminants.
Synthesized and quality-tested within the United States. Domestic operations mean faster fulfillment, consistent supply chain control, and no customs delays for US researchers.
Our minimum purity threshold is 98% as measured by HPLC. Most products exceed 99%. Purity data and mass spectrometry confirmation are included with every COA.
High-performance liquid chromatography (HPLC) and mass spectrometry (MS) are used to verify molecular identity and rule out synthetic by-products or degradation compounds.
Temperature-sensitive peptides ship with appropriate cold-chain packaging to preserve stability during transit. Lyophilized powders are sealed under inert gas.
All orders ship in sealed, labeled research packaging with product documentation. Packaging is designed for laboratory receipt and record-keeping compliance.
Yes. US Peptide Science sources and quality-verifies all compounds within the United States. We do not re-label imported bulk API. Our domestic supply chain allows us to maintain stricter quality oversight and faster turnaround for US researchers.
Lab-grade research peptides meet defined purity thresholds (typically ≥98% by HPLC), are verified by mass spectrometry for molecular identity, and are accompanied by a Certificate of Analysis. They are produced under controlled conditions but are not pharmaceutical-grade (GMP) and are not intended for human use.
Yes. Every product listing includes access to the current batch COA, which contains HPLC purity data, MS confirmation, and batch-specific quality parameters. COAs are issued by independent third-party testing laboratories.
Overseas suppliers often offer lower prices but with greater variability in purity, inconsistent documentation, and import complications. As a US-based supplier, we offer faster domestic shipping, verifiable third-party testing, and a consistent supply chain — all critical for reproducible research outcomes.
We sell individual research quantities suitable for standard preclinical experiments. Bulk pricing inquiries for institutional or multi-lab use can be directed to our research team via the contact page.
Browse our full catalog of US-made, third-party tested research peptides with COA documentation and fast domestic shipping.
Shop Research Peptides →Research Use Only: All products sold by US Peptide Science are intended solely for laboratory research purposes by qualified professionals. These compounds are not approved for human or veterinary therapeutic use, are not dietary supplements, and are not intended for any use other than scientific research. Purchase and use must comply with all applicable local, state, and federal regulations.