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Ozone therapy is the safest and most effective cancer therapy I have ever found. An interesting aspect of ozone therapy is that ozone has the ability to selectively destroy cancer cells without damaging healthy tissue.
See: http://www.ncbi.nlm.nih.gov/pubmed/7403859
Science. 1980 Aug 22;209(4459):931-3.

Ozone selectively inhibits growth of human cancer cells.
Sweet F, Kao […]