A researcher's guide to purity, quantity and what a vial label means

Milligrams on a label, purity on a certificate and net content in practice: three different ideas worth separating.

Three numbers, three meanings

Labeled quantity is the amount of lyophilized material the vial is filled to. Purity is the share of the main component among the detected components. Net peptide content accounts for water and counter-ions that are part of the powder but are not peptide.

Why it matters for planning

When you plan concentrations for in-vitro work, record the labeled quantity, the lot, and the purity from the certificate so your records trace back to a document.

Keep the paper trail

Save the certificate for the lot you use. Our certificate lookup opens the batch report whenever you need it again. All products are for laboratory research use only.