(Argon Gas)

Winesave stores high-quality, food-grade argon gas under pressure which when dispensed into an opened bottle preserves the wine by forming an inert barrier that stops spoilage from oxygen, without affecting the characteristics of the wine.

The reason why your opened bottle of wine starts to go bad, or taste like vinegar, is due to oxidation, i.e. oxygen coming in contact with the wine and reacting with it. To keep your left over wine from spoiling, you need to keep oxygen away from your wine.

The wine industry has used gases like argon for years to help keep wines during bottling. Argon is a naturally occurring gas that makes up ~1% of our atmosphere. We breath in argon with every breath. So it's 100% natural and completely harmless.