A: Argon is a non-toxic, inert gas. There are actually trace amounts of argon gas in the air that we breathe everyday. Since it's an inert gas, argon doesn't mix or react with other elements or material under normal conditions, and simply stays as argon. When used with Coravin's wine preservation system, the argon acts like a blanket that simply covers the wine, and since it's heavier than oxygen, it prevents oxygen from touching the wine and prevents the oxidation of the wine (oxygen does react with wine and oxidation is what makes the wine "go bad"). As long as the argon is used as intended with the Coravin systems to fill the wine bottle only, it is considered safe.