peroxide is a good anti-bacterial agent. The reason being that it's toxic to cells. Your cells have an enzyme that can break it down and render it into O2 and H20. Bacteria don't have this and so it kills them.
There have been some interesting preliminary studies that link things like high blood pressure and ulcers and whatnot to bacterial or viral infections of the stomach, so it's entirely possible that drinking the stuff might have had a real effect on some of that. But none of that is tested. keep in mind that another use for the stuff is to make your dog throw up that brillo pad that he ate, it might have the same effect on you /ubbthreads/images/graemlins/icon15.gif
As far as absorbing actual usable oxygen from drinking the stuff, it IS possible to absorb O2 dissolved in water, but you need gills to do it with any efficiency /ubbthreads/images/graemlins/wink.gif
Also, peroxides are very reactive and potentially nasty cancer causing chemicals. The molecular oxygen released when it breaks down is very reactive! So you gonna up your intake of antioxidants when you're doing this? Perhaps they would cancel each other out and do nothing /ubbthreads/images/graemlins/grin.gif
Also, there are some studies that show that taking H202 might actually increase the expression of HIV and maybe other viruses as well. So if you have HIV or hepatitis or something you'll want to do a lot more research before you start a course of this.
If you're otherwise healthy and stick to a very low concentration of it it's probably safe to do once in a while. but I certainly don't see anything that makes me think it should be a normal part of your daily ritual.
The high concentrations of the stuff can actually be quite dangerous. You can't get anything more than about 30% commercially, but even that can create a LOT of gas if you get something into it that acts as a catalyst or get it too hot or something. It will explode due to pressure, so be careful how you store it if you get the higher concentrations of the stuff. In 60 to 90% it's actually rocket fuel! You can decompose that concentration of it into steam and heat and lift off with it.