Big Ox O2, an American manufacturer, provides high-purity (95%) oxygen in a recyclable aluminum can at 4.5x the purity of the Earth’s atmosphere. The can contains a one-of-a-kind, patented mouthpiece that eliminates purity dilution during inhalation. Big Ox O2 is a safe and legal supplement option used for altitude acclimation, power & endurance before physical exertion, increasing focus & concentration, and reducing the effects of alcohol hangovers.