Both therapies have been used around the world by conventional and alternative medical doctors alike in oral, rectal, vaginal, intramuscular and intravenous forms for nearly a century. As with all therapies, toxicity may be encountered and there are a variety of opinions on this issue. If ozone is inhaled in large quantities, it can be toxic. Combined with environmental pollutants like petrochemical hydrocarbons, ozone can irreversibly damage lung and other body tissues. The same is true of hydrogen peroxide, oxygen, water and any other nutrient.
Toxicity is a matter of degree.
It is a biochemical fact that the body manufactures its own hydrogen peroxide under certain conditions. For ozone, hydrogen peroxide, oxygen and water to become toxic, huge amounts far more than the recommended levels used in therapy would have to be consumed. Safety of oxygen therapies is further ensured when they are used as a part of a comprehensive health promoting program that takes into account an optimal diet and antioxidant nutritional supplements like beta carotene, vitamin C, vitamin E and selenium. By and large, the medical use of oxidative therapies is safe and effective for a broad range of conditions. Using these therapies in isolation from all others could lead to problems.