Valyria Peptides / research peptide guides
How to read a peptide COA
A peptide Certificate of Analysis (COA) is useful only when it can be connected to the material and batch you are evaluating. Start with sample identity and traceability, then read the analytical method and result together.
Prepared with automated writing assistance from Valyria Peptides’s catalog rules and the sources listed below. This page explains our record checks and calculator assumptions; it is not a laboratory protocol or a product-use recommendation.
Match the record before the percentage
Compare the compound name, presentation, SKU and batch code. Check the issuing laboratory and report date. If a label and document refer to different batches, a shared product name does not fix the mismatch. Valyria Peptides’s COA library groups published records by SKU and shows the batch explicitly so this comparison can be made before ordering.
Read the method alongside the result
An HPLC purity percentage belongs to the stated chromatographic method and tested sample. It is not, on its own, an identity test, a measurement of the mass inside each vial or a sterility result. Review which tests the report actually contains. Missing identity, endotoxin or other data should remain unreported rather than being inferred from a high purity number.
Check claims against their evidence
A statement such as purity ≥99% HPLC needs a corresponding result for the affected batch. Third-party tested describes the testing relationship and needs an identified source; it is not a blanket certification of every catalog product. Valyria Peptides does not apply either statement across the catalog. Read the original PDF rather than relying solely on a product card or a cropped image.
Use the file record to detect changes
Each published Valyria Peptides document record includes a SHA-256 checksum, reviewer and review date. A checksum lets you compare an exact downloaded file with the reviewed file record. It does not establish that the laboratory is independent or that the analytical conclusions are correct. Report a broken link, changed file or batch mismatch through support with the SKU and document title.
Products and further reading
Valyria Peptides sources: published products, the quality standard and the research-use terms. Batch-level claims remain in their individual source documents.