I bought a medical grade ozonator from PromoLife.com, hoping it will fix cancer. I've only had it for a week, but I already feel much better and the Arthritis in my knee has nearly quit hurting - I was afraid I'd have to have surgery on it. I've ordered their personal steam sauna to use the ozone in too. I'm very impressed! And I've read that heat kills cancer because the cells are closer together than healthy cells, so they don't tolerate heat.