DMSO also relieves the pain of cancer and, by being a free radical scavenger, reduces the side effects of radiation therapy. The FDA's authority extends to the determination of whether or not an item is safe, and it is up to the doctor to determine its correct use. While the FDA specifies approval only for treatment of interstitial cystitis this specification has no teeth. Ozone One of the many sad facts of standardized American medicine is the great difficulty encountered by doctors who use ozone to treat anything. They have that wrong.
Ozone is safe.
Other than safety, the other feature about ozone is that it is relatively inexpensive and cannot be patented because it is abundant in nature. This is the real problem for the medical cancer establishment. Some doctors offer ozone in the US despite the restrictions. Some states do not choose to harass doctors who offer ozone therapy. Others choose to take their licenses.