Calcium Supplements May Trigger Constipation, Study Warns

Calcium supplements are widely used, with around 22% of men and 32% of women taking them regularly. However, research from the National Institutes of Health suggests these supplements may cause constipation in some people. The issue appears linked to how calcium affects digestion, particularly when taken in certain forms or combinations. Calcium can slow down fluid secretion in the gut, leading to hard or dry stool. Among the different types, calcium carbonate is often seen as the most likely to cause this problem. When combined with vitamin D, the risk of constipation may rise further.

Other supplements, including iron, folic acid, and berberine, have also been tied to slower digestion. For those experiencing issues, a calcium-magnesium blend might help reduce the likelihood of constipation. Eating more fibre-rich foods and drinking enough water can also ease symptoms. Chronic constipation is diagnosed when someone has three or fewer bowel movements per week for over six months. While not everyone will be affected, the connection between calcium and digestive slowdowns remains a concern for regular users.

The link between calcium and constipation highlights the importance of choosing the right supplement form. Those prone to digestive issues may benefit from adjusting their intake or pairing calcium with magnesium. Simple dietary changes, like increasing fibre and hydration, can also make a difference in managing symptoms.