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October 10, 1980

Diarrhea From Vitamin C

JAMA. 1980;244(15):1674. doi:10.1001/jama.1980.03310150014012

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To the Editor.—  I was interested in the article "Runner's Trots: Gastrointestinal Disturbances in Runners" (243:1743, 1980), which discussed diarrhea in runners.There is another interesting source of a milder runner's diarrhea. Many runners have been advised that generous doses of vitamin C (1 g/day or more) will lessen musculoskeletal symptoms. Such doses of vitamin C frequently produce diarrhea, the source of which may be unrecognized for a long time.