Varies: Good question. For those who encourage increasing your vitamin C intake like Linus Pauling. They talk about bowel tolerance or the point where the dose causes diarrhea. Practitioners that advocate taking extra C will say take a dose till you get loose stools then back off. For many people this is between 1 or 2 grams. Although for some higher and some lower.
Answered 11/26/2014
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