As of 2010
vitamins have not been found to be effective at preventing cancer.
[72] While low levels of
vitamin D is correlated with increased cancer risk.
[73][74] Whether this relationship is causal and vitamin D supplementation is protective is yet to be determined.
[75] Beta-carotene supplementation has been found to increase slightly, but not significantly risks of
lung cancer.
[76] Folic acid supplementation has not been found effective in preventing colon cancer and may increase colon polyps.
[77]
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