In the human body it serves to activate the immune system, and is produced in areas such as the large intestine to prevent bacteria from growing out of control. Hydrogen peroxide is manufactured in different strengths or grades for different purposes. For example, the liquid at the drug store is 3 percent hydrogen peroxide. In manufacturing, a solution of 30 percent hydrogen peroxide is used to wash transistors before assembly. They advise bathing in a diluted solution, gargling with it, spraying it over the body, or soaking injured body parts in it.
Some practitioners inject the diluted solution directly into the bloodstream.
For chronic ailments, hydrogen peroxide therapy may be recommended on a long-term basis. IV hydrogen peroxide therapy may take as long as 3 hours to administer. When a diver surfaces to quickly, bubbles of gas develop in the bloodstream and threaten to disrupt circulation to vital organs. The pressurized atmosphere in the hyperbaric chamber reduces the size of these bubbles so that they can pass through the circulatory system without blocking the arteries. Used as an antidote for carbon monoxide poisoning, hyperbaric oxygen treatment floods the body with oxygen to force the carbon monoxide out.