The FDA does not authorize the use of ozone therapy in illness treatment. It has also been said that "no known effective medicinal application" of ozone exists. In addition, there aren't enough large-scale, long-term research to understand all of the potential side effects. Finally, since ozone is unstable and decomposes into oxygen and other compounds when it comes in contact with blood, any drugs found in blood samples taken after an injection of ozone could be due to contamination. Drugs are toxic if they're not what they appear to be. However, since ozone has many beneficial properties that can be used for healing purposes, its effects may be different from person to person. Some people may benefit from it while others might experience some harmful side effects. The only way to know for sure is by trying it yourself. If you do decide to try it, read all instructions carefully and wear protective clothing during treatment.