How to read a peptide certificate of analysis

Materials sold by PeptideLattice are for laboratory research only. They are not medicines. This page explains how to read a certificate of analysis (COA). It is not a protocol and not medical advice.

A COA is a lab report for one lot. It is not a promise about every future lot. Ask for the COA that matches the lot number on the vial.

What to look for

• Compound name and stated milligrams per vial
• Lot or batch number
• Test date
• Method (HPLC, MS, or both)
• Purity as a percentage
• Identity confirmation (does the mass match the sequence)
• Appearance (lyophilized powder)
• Storage note from the tester

What a COA does not prove

• That the vial is sterile for injection
• That the material is safe in humans or animals
• That the next lot will match this lot
• That a published animal study applies to your experiment

How PeptideLattice handles documents

Certificates are provided when available for the lot you receive. If a COA is missing for a lot, treat that as incomplete documentation and do not invent the numbers.

Research use only. Not for human or animal use.