Few things in medicine get simpler the more you investigate them, and the use of vitamins, minerals, and herbal and botanical supplements to prevent or treat cancer is no exception. Recent clinical trials, for example, suggest that supplements of single nutrients like vitamin B, C, and E and the mineral selenium do not, as once thought, prevent chronic or age-related diseases including prostate and other kinds of cancer. Some substances, like green tea and ginger, seem to have potential in preventing or helping to treat cancer, but they may also actually interfere with treatment or have other serious side effects. Meantime, countless substances that kill or slow the growth of cancer cells in a test tube have not shown that same success in human beings.
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