A second way is to increase the amounts of anti-oxidants in the food. This includes beta carotene, vitamin C, vitamin E, pycnogenol, and others. Controlled medical studies have proven their ability to decrease the incidence of cancer in humans. Maybe chemotherapy 8. Some types of cancer can be fully cured by surgery, if they only invade locally, if they are caught early, and if a big enough piece of tissue is removed.
Herbs can be toxic.