Many nutrients, such as vitamin C, are already prone to destruction from oxidation. This is why I avoid liquid vitamins. Oxidizers do not work in dry environments. When water is added though they do activate and readily destroy many nutrients. Adding an oxidizer like hydrogen peroxide will just speed up the rate of destruction. This is especially true if the supplements you add the peroxide to are alkaline. Peroxides readily decompose in an alkaline environment, and are stabilized by acids. This is why acidic substances, such as phosphoric acid, are added to the 3% peroxide solutions commonly found in stores.