Can taking vitamin C supplements help prevent heart disease and cancer?

Dariush Mozaffarian, MD
Internal Medicine
Despite a handful of studies hinting that vitamin C might ward off heart disease and cancer, evidence offers no support for supplemental C. Findings from the Physicians' Health Study II, which followed 14,641 men who took 500 mg of vitamin C daily for a decade, found no difference in the number of heart attacks, strokes, or deaths from cardiovascular disease compared with men who took placebos. In a separate analysis, researchers found that the likelihood of developing cancer was also nearly identical whether the men took vitamin C or a placebo. The study results were published in The Journal of the American Medical Association.

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