Pls see under " Has anyone else gotton liver spots " in Oxygen Therapies Forum. Hydrogen Peroxide oxidize in body, and yet the body is not be able to detox fast enough. So the same is true for ozone. A lot of readers in Dr. Saul Pressman has rashes and fluid in ears after ozone sauna and ear insuflation. I called one guy on the phone that he has " weeping ear " for 8 months. One lady has middle ear infection also. We never known how our body absorb toxin over long period of time---say 40 years for I am in my 30's. ALSO, THERE IS NOT SUFFICIENT RESEARCH TO SAY HOW OZONE ACCUMULATE TOXIN IN THE BODY FOR OVER 40 YEARS. JUST LIKE DRUGS, NOW THERE ARE FACTS NOT KNOWN DOES NOT MEANT IT IS NOT SIDE EFFECT IN FURTURE. AND I THINK YOU HEARD OF TOXIN SHOCK SYNDROME. Side effect in medical terms is any effect, so nausea is considered one of the side effect when it does not process any harm. I do appreciate your sharing for we just want to help.