Without alkalising first, hydrogen peroxide will do little more than make you nauseous and possibly headachy as it interacts with the waste in your colon. Oxygen needs a pH neutral or an alkaline medium to effectively dissolve.
Hydrogen peroxide on its own, without pH correction will actually acidify you.
If using Hydrogen Peroxide for oxygenation, it is recommended that taking a 5 day course of Magnesium Peroxide Powder PRIOR to using the H2O2. The Magnesium Peroxide will clear the body and gut from any excess acid and mucous and only then can the oxygenating effects from the Hydrogen Peroxide be fully absorbed.