adding oxygen to the cells.... your lungs do that already, and there are a number of things that can't be cured simply by increasing blood oxygen levels, pretty much everything. if it claims to cure "everything" than clearly its violating FDA regulations that require such claims to be backed up by evidence. if it makes vague claims like "supporting health" in one way or another its advertising in a way to avoid FDA regulation.
anecdotal evidence is essentially worthless, the person claiming "it cured me" has no way of knowing weather or not the product actually effected their condition, or if it's simply a case of taking the product while they were getting treated, or getting better on their own anyway. that's why its not recognized as evidence.
bottom line is that your wasting money on fancy water drops.
alternative medicines can be dangerous, especially when used as a replacement. there's no regulations, no requirements to list possible side effects, or anything like that. if you have a problem go to a real medical doctor, don't look for the product that is cheapest or make the most pie in the sky claims, go with the product that has been demonstrated to work in a scientific way.