Some studies say CBT is as effective as pills -- if not more -- and has no side effects.

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According to Andreas Jordan, the firm's chief scientist, this procedure has no side-effects and shows particular promise against glioblastomas, a deadly type of brain cancer, and against prostate cancer.

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Zadaxin has no serious side effects.

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While red yeast rice has no known drug interactions and fewer side effects than statins, it could theoretically interfere with other medications and should be avoided by women who are pregnant or nursing and people with severe liver or kidney disease.

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Both drugs are used in combination with another compound, ribavirin, and there is no proof that Pegasys is more effective or has fewer side effects.

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This has meant that no system exists to track potentially life-threatening side effects of herbal medicines.

ECONOMIST: Herbal remedies

Now doctors are left to ask when they will get more answers about a drug that has become widely used because it cut cholesterol, caused no obvious side effects and was heavily advertised.

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However, a study carried out by the University of Michigan Cancer Centre has concluded that women with the genes have no extra chance of either cancer recurrence, or these side-effects.

BBC: Breast gene radiation fears eased