After a diagnosis of cancer, patients often initiate or increase their use of vitamins and dietary supplements, and their use is prevalent among the 11.7 million adults in the United States living with cancer. Whereas 50% of healthy adults take 1 or more dietary supplements, between 64% and 81% of cancer survivors report that they use vitamin or dietary supplements.1 Reasons offered for using these alternative therapies include strengthening the immune system, increasing the chance to be cured, and gaining a sense of control over their disease.
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