Can taking vitamins cause diarrhea?
Diarrhea refers to loose or watery stools, and taking vitamins generally does not cause diarrhea.
Vitamins are essential trace nutrients for the body. If a person lacks vitamins, they can supplement them in appropriate amounts under a doctor's guidance. When taken as prescribed—correct dosage and duration—vitamins usually do not lead to diarrhea. However, if vitamins are taken on an empty stomach or in excessive doses, they may irritate the gastrointestinal mucosa, potentially causing diarrhea in some individuals, along with possible nausea. Additionally, individuals with poor gastrointestinal function or chronic enteritis may develop gastrointestinal issues after long-term vitamin use, which could result in diarrhea.
If diarrhea is mild, patients can adjust their medication regimen under medical supervision—for example, by taking vitamins after meals—or follow a doctor’s advice to modify the dosage. For more severe diarrhea, medications such as probiotics, smectite powder, or lactase tablets may be used under medical guidance to help regulate the digestive system.
Moreover, while taking vitamins, patients should maintain a light diet and avoid raw, cold, or irritating foods to support intestinal health.