Which vitamins cause constipation?

Constipation is a commonTrusted Source side effect of iron supplementation.

Experts do not fully understand why iron supplements cause constipation, but it may be due to water movement in the digestive tract.

When the stomach contains a lot of iron, it may causeTrusted Source water to move from the lower part of the gut into the intestines to dilute the stomach contents.

Because water leaves the lower part of the digestive tract, the stool there becomes drier and harder, which leads to constipation. This is why it is important to manage iron intake and stay hydrated while taking iron supplements.

Constipation is also a commonTrusted Source side effect of taking calcium supplements. However, researchers report that the data on this is mixed, and experts have not yet determined why calcium might cause constipation.

There are a few thingsTrusted Source a person can do to ease constipation when taking vitamin and mineral supplements:

• Increasing water intake: Staying hydrated can help keep water flowing through the digestive tract and can soften stools to help prevent constipation.
• Eating fiber-rich foods: Fruits, vegetables, whole grains, and legumes can help boost a person’s fiber intake and support healthy digestion.
• Contacting a doctor: A doctor may advise a person to stop taking supplements, adjust their dosage, or recommend an alternative.
• Using over-the-counter medications: A healthcare professional can recommend laxatives to help ease constipation. These may include fiber supplements and stool softeners.
• Exercising: Regularly exercising may help relieve symptoms of constipation.

Although iron and calcium supplements have links to constipation, following a balanced, fiber-rich diet and staying hydrated can help minimize this side effect.