How to read a peptide COA

What a COA is

A Certificate of Analysis is a batch document. It ties one lot number to the tests run on that lot — not to the brand, the SKU family, or next month’s inventory.

For VaultLabs peptides the published record, when uploaded, is searchable from COA search and batch verification. Your laboratory still sets acceptance criteria.

Fields to match before the vial enters inventory

Product name and nominal strength on the COA must match the order SKU and the printed vial label.

Lot / batch identifiers must match across the COA, the vial, the packing list, and your receiving log. A mismatch is a stop, not a footnote.

Note the test method (often HPLC for peptides), the test date, and the lab named on the document when it is disclosed.

How to read HPLC purity

The purity percentage is the main peak under that method, on that day, for that lot. It is not a promise that your in-house method will print the same number.

Treat the COA as the supplier’s reference layer. Understanding HPLC covers why methods are not interchangeable.

Purity, identity, quantity and sterility are four different questions

Purity is usually an HPLC area-percent for the main peak. It does not prove the sequence is correct, that the labelled milligrams are in the vial, or that the cake is sterile.

Identity is a separate method — often mass spectrometry or a matching chromatogram when that data is on the record. Mass spectrometry covers that question.

Quantity is the labelled mass (for example 10 mg) or a quantitative assay when one is published. A 99% purity figure is not a 10 mg assay.

Sterility is a microbial specification. Most lyophilized peptide certificates in this catalogue do not claim sterility for human use, and a purity line never stands in for that test.

Document provenance

Read who issued the record. The laboratory printed on the certificate is the laboratory for that lot. A partner list on another page is not a substitute for that field.

Note whether the published file is labelled as an independent-laboratory report or as supplier paperwork. A PDF on letterhead is not automatically third-party testing.

When nothing is online yet

A missing portal record usually means analytical release or upload is pending. It is not automatic evidence that the material failed.

Institutional buyers who need a PDF before the vial is released should build that lead time into procurement. Request the lot by identifier rather than asking for a generic “quality certificate.”

A receiving checklist

Confirm SKU and strength. Confirm lot. File the PDF. Assign a storage location from the storage guide. Release to inventory only after that list is complete. For the numeric fields after names already match, see interpreting assay results. The process wrapped around that reading — keeping the custody signature at receiving separate from the documented release decision, and giving a discrepancy a named owner — is set out in the COA verification workflow for UAE labs.

The same steps as a printable walkthrough: COA receiving checklist.

COA data does not make the material suitable for human use. VaultLabs materials remain in vitro research reagents.

Example: qualifying a BPC-157 10 mg lot

Take BPC-157 10 mg. Match the printed lot to batch verification or the BPC-157 COA index before the vial is opened. Sequence, CAS, and literature context sit on the BPC-157 monograph — they are not a substitute for the lot record.

The annotated table below uses a published certificate for lot VL-BPC-2026-0412. It is a reading aid for that lot only.

After the lot is accepted, concentration arithmetic for a 10 mg vial is SOP-owned. The peptide reconstitution calculator only converts the volume your protocol already chose.