Is it normal to have diarrhea after taking vitamin C? The link between high doses and GI upset
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4 min read
According to the National Institutes of Health, the tolerable upper intake level (UL) for vitamin C in adults is 2,000 mg per day. Taking significantly more than this can lead to uncomfortable gastrointestinal side effects, so it is not abnormal to have diarrhea after taking vitamin C supplements. This reaction is a common, though not necessarily healthy, side effect of excessive intake rather than a sign of serious toxicity.
