Why COAs matter for research peptide quality
A Certificate of Analysis (COA) is the primary document linking a specific manufacturing batch to independent analytical results. For qualified laboratories, matching the lot on your vial to a published COA confirms identity and purity before experiments begin—not marketing claims on a product page.
At NeoBio, every new manufacturing lot undergoes third-party analysis before release. Published COAs on our Lab Testing page correspond to specific batch/lot numbers, with historical records kept for transparency and traceability.
Key fields on a peptide COA
Product name and analysis date identify what was tested and when. The batch/lot identifier—such as AR-BPC157-2401A for BPC-157 10mg—is the critical link between your shipment and the certificate.
Purity percentage comes from HPLC (high-performance liquid chromatography), the standard method for peptide purity assessment. NeoBio catalog peptides typically show ≥99% purity on qualifying lots verified by independent US laboratories.
COAs also summarize testing methodology. Standard packages focus on identity and purity; additional assays such as endotoxin or sterility testing may be arranged for institutional contracts.
Matching your vial to the correct lot
Before reconstitution, locate the lot number on your research vial label and search our Lab Testing / COAs page. PDF copies are available when published for lots including BPC-157, TB-500, CJC-1295, Ipamorelin, Tirzepatide, GHK-Cu, Epithalon, and PT-141.
If you need documentation for a particular shipment not yet listed, contact our team via the contact page with your lot number and product name.
What HPLC purity does—and does not—tell you
HPLC purity measures the proportion of the target peptide relative to detected impurities in the tested sample. It supports reproducibility in receptor binding, stability, and pathway studies but does not replace full structural characterization for novel programs.
Purity percentages on our COA page come from HPLC analysis performed by independent laboratories—not internal QC summaries. This is the same standard referenced in our quality assurance messaging across the catalog.