The Certificate of Analysis is the manufacturer’s signed statement of what is actually in the vial. Here is how to read each section — identity, HPLC purity, net peptide content, residual solvents, and batch data — so you can evaluate every batch with confidence.
Lyophilized peptides ship dry for stability — how you reconstitute and store them determines how long they stay usable. A practical walkthrough of solvent choice, concentration math, storage temperatures, and why aliquoting beats repeated freeze-thaw cycles.
“99% pure” is a measurement, not an opinion. A plain-language look at how reversed-phase HPLC quantifies purity and how mass spectrometry confirms identity — and why seeing the raw chromatogram and mass spectrum matters more than the number on the label.
“Research grade” has no single legal definition, which is exactly why sourcing matters. What the term should mean, why batch-to-batch consistency is the real product, the questions worth asking any supplier, and why independent third-party testing carries more weight.
A peptide can be 99% pure and still arrive compromised if shipping is treated as an afterthought. How we move research peptides worldwide — lyophilized for the journey, insulated cold-chain packaging, batch COA in the box — so quality reaches your bench intact.
