Calcium Supplements May Trigger Constipation—Here's How to Avoid It

Calcium supplements are widely used, with around 22% of men and 32% of women taking them. However, they are often linked to digestive issues, particularly constipation. The National Institutes of Health confirms that calcium can cause this problem in some individuals. Calcium carbonate is the form most frequently associated with constipation. It may reduce intestinal motility and fluid secretion, resulting in dry stool. Taking vitamin D alongside calcium can further increase the risk of constipation.

Other supplements, such as iron, folic acid, and berberine, have also been connected to slower digestion. To counter these effects, experts suggest pairing calcium with magnesium. Eating fibre-rich foods and drinking plenty of water can also help relieve symptoms.

Chronic constipation is defined as having three or fewer bowel movements per week for over six months. Calcium remains a common supplement, but its use may lead to constipation for some. Combining it with magnesium, fibre, and hydration can reduce this risk. Understanding these effects helps users manage their intake more effectively.