Oxygen therapies change the body's chemistry to help overcome disease, promote repair, and improve overall function. These therapies have been found to be effective in treating a wide variety of conditions, including infections (viral, fungal, parasitic, bacterial), circulatory problems, chronic fatigue syndrome, arthritis, allergies, cancer, and multiple sclerosis.

  Oxygen therapy uses oxygen in various forms to promote curing and destroy pathogens (disease-producing microorganisms and toxins) in the body. It is one of the therapies grouped according to the type of chemical process involved: the addition of oxygen to the blood or tissues is called "oxygenation," and "oxidation" is the reaction of splitting off electrons (electrically charged particles) from any chemical molecule. Oxidation may or may not involve oxygen (oxidation refers to the chemical reaction and not to oxygen itself). One therapy that uses the process of oxygenation is hyperbaric oxygen therapy, which introduces oxygen to the body in a pressurized chamber. Hydrogen peroxide therapy, on the other hand, uses the process of oxidation. Ozone therapy uses both of these chemical processes. Although various oxygen therapies have been used in Europe for many years for a wide range of conditions, in the United States, most remain controversial and are currently unapproved by the FDA (Food and Drug Administration).