Every vial is sealed under argon
An ordinary vial is filled in room air and handed to you with that air still inside. Oxygen is left sitting against the product for its entire shelf life, and every draw pulls more in behind the needle. We do not do that. Our vials go through repeated cycles of vacuum and argon backfill, so the headspace above the product is inert gas rather than air — and the closure system is chosen so none gets back in afterward. Argon is heavier than air and chemically unreactive, which is why it is used to protect oxidation-sensitive material in industries far more demanding than this one. Most testing tells you what was in a vial the day it was tested. This is about what is still there weeks later, when you actually use it.
How the argon system works