There's a lot of hype about the hydrogen peroxide therapy, but....?

I 'm not sure you're correct about H4O3 bit. From what I can tell it would just mix with the water much the way sugar does. H2O2 decomposes to form H2O and O2 over time. I know it's used as a disinfectant. It is a source of oxygen which kills anaerobic bacteria, hence its use in toothpastes and wound cleansers. It's used to bleach clothing and hair. With all the stuff about the health benefits of antioxidants, I'd be a little skeptical about taking an oxidizer. The body does have an enzyme systems (peroxidases) to handle them.