We could have filled this page with the certificates from our vial catalogue. They are real, they are independent, and they would be completely irrelevant to what you are buying — a different manufacturer, a different product state, and a different set of things that can go wrong. So here is the standard this line is actually held to.
Identity, purity, sterility, endotoxin and fill volume are run on the filled unit. Documentation for the lot you are shipped comes through the wholesale desk with your order.
Ask the wholesale deskPlenty of suppliers will hand you a certificate for the raw peptide and let you assume it covers the device. Three things change when the same compound arrives pre-filled, and each one breaks that chain of evidence.
Every test below is performed on the filled unit — the device you would hand a patient — not on the raw peptide before it goes in.
Confirms the peptide in the pen is the peptide on the label. The single test no other result means anything without.
Run on the filled solution, not on the powder before filling. A purity figure from before the fill says nothing about what is in the device.
A pre-filled injector is a sealed sterile presentation. This has no equivalent in a vial line, where the buyer reconstitutes and carries that risk.
Bacterial endotoxin survives sterilisation. Reported per millilitre against the dose the device actually delivers.
A dose-graduated pen is only accurate if the fill matches the label claim. Verified per lot rather than per unit.
The one that decides shelf life and storage. Peptide in solution degrades where lyophilised powder does not — particularly the GLP-1 class.
Results are reported against a lot number, so any figure you are given can be matched to the carton in your hand. Ask for the lot documentation before you commit shelf space — on this line or anyone else's.
Including us. If a supplier cannot answer these about a pre-filled product, that is the answer.