When ozone is introduced into the bloodstream, it is converted into oxygen, hydroxyperoxides and other beneficial free radical scavengers which actually seek out and destroy diseased cells. This paper dealt with the exposure of human lung, breast, and uterine cancer tissue to ozone at concentrations of 0.3 to 0.8 parts per million, well within the non-toxic limits tolerated safely during the average ten minute period that medically administered ozone takes and concentrations far less than that are used. In the experiments, normal human cells were not effected at these levels. The modern development of ozone application in medicine gained impetus in the 1950's in Europe, and its use gradually spread throughout Europe to Australia, Israel, and Brazil. The earliest evidence that I could locate of ozone's recommendation as therapy in the United States, appeared in an 1885 issue of the Journal of the Dade County Medical Association.
Ozone is classified as a toxic gas if inhaled in large quantities.
However, it is not toxic when injected slowly into the body by intra-arterial injections, I.V., intramuscularly, subcutaneously or by vaginal or rectal insufflation. Ozone has no side effects when administered, using these methods, in the proper quantities and concentrations. It does not effect healthy cells of any type adversely under those conditions. It is obvious why it is lethal to cancer cells. Individuals receiving ozone for the first time are usually apprehensive.