Another shitty product with lots of marketing hype around
Drinking bottled water described as “oxygenated” before exercising does not enhance athletic performance, according to a study in the Journal of the American Medical Association (2003;290:2408–9). Although most of the brands of water tested contained more oxygen than tap water, the higher oxygen content appears to provide no health benefits.
[...]
These results cast serious doubt on whether any health benefits could be expected by consuming water that contains more oxygen than that which is normally present

Drinking bottled water described as “oxygenated” before exercising does not enhance athletic performance, according to a study in the Journal of the American Medical Association (2003;290:2408–9). Although most of the brands of water tested contained more oxygen than tap water, the higher oxygen content appears to provide no health benefits.
[...]
These results cast serious doubt on whether any health benefits could be expected by consuming water that contains more oxygen than that which is normally present