Pregnant women may be at an increased risk of developing a vitamin D deficiency.

Some recent research has shown taking higher daily amounts of vitamin D (4,000 IU) during pregnancy may lower the risk of certain complications, such as gestational diabetes and preterm labor.

Prenatal vitamins might not provide enough vitamin D, so talk to your doctor about additional supplementation.

Be sure to tell your physician if you're pregnant or plan to become pregnant before taking vitamin D.