What Vitamin Deficiency Causes Loose Stools?
What Vitamin Deficiency Causes Loose Stools? However, some people may experience constipation as a result of a vitamin deficiency, such as vitamin B-12 deficiency. In those situations, a vitamin supplement may help relieve constipation. Some vitamins and minerals can cause loose stools or diarrhea, including magnesium and vitamin C. Can a vitamin deficiency cause diarrhea?