0.5 % X 1.4 gm/l = 7 ug/ml
1.0 % X 1.4 gm/l = 14 ug/ml
1.5 % X 1.4 gm/l = 21 ug/ml
2.0 % X 1.4 gm/l = 28 ug/ml
2.5 % X 1.4 gm/l = 35 ug/ml
3.0 % X 1.4 gm/l = 42 ug/ml
3.5 % X 1.4 gm/l = 49 ug/ml
4.0 % X 1.4 gm/l = 56 ug/ml
4.5 % X 1.4 gm/l = 63 ug/ml
5.0 % X 1.4 gm/l = 70 ug/ml
5 % or 70 ug/ml is considered to be the upper limit of concentration for internal use of medical ozone.Dr. Greenberg, formerly of the Kief Clinic, has shown, in vitro, that at concentrations of 90 ug/ml there was crimping of red blood cells which was definitely harmful.
Experiments by F. Sweet et al, have shown inhibition of growth in healthy cells at concentrations above 70 ug/ml.
If we stay below that level, we will have no problems. Generators that produce higher concentrations can be dangerous for home use. Medical ozone therapy has been found to be an extremely safe modality, free from the dangerous side effects associated with drugs. In a 1980 study done by the German Medical Society for Ozone Therapy, 644 therapists were polled regarding their 384,775 patients, with a total of 5,579,238 ozone treatments administered. There were only 40 cases of side effects noted out of this number, which represents the incredibly low rate of .000007 %, and only four fatalities. Ozone has thus proven to be the safest medical therapy ever devised.Prof. B. Halliwell of the University of London has stated, after researching the topic, that there has never been a case cited in the medical literature of damage caused in vivo by the O1 oxygen radical.