Question: Data were collected over a decade from 1021 men and women with a recent history of precancerous colon polyps. Participants were randomly assigned to receive

Data were collected over a decade from 1021 men and women with a recent history of precancerous colon polyps.

Participants were randomly assigned to receive folic acid

(a B vitamin) or a placebo, and the study concluded that those receiving the folic acid may actually increase their risk of developing additional precancerous growths. Previous studies suggested that taking folic acid may help to prevent colorectal cancer. (JAMA 2007, 297)

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