Iodine supplements may improve mental function with even mild deficiencies in the nutrient.

Iodine nutrition plays a crucial role in the intellectual development.

The body needs iodine to make thyroid hormones. These hormones control the body's metabolism and many other important functions. The body also needs thyroid hormones for proper bone and brain development during pregnancy and infancy.

Your heart rate is a measure of how many times your heart beats per minute.

It may be affected by your iodine levels. Too little of this mineral could cause your heart to beat slower than usual.

A severe iodine deficiency may cause an abnormally slow heart rate. This could make you feel weak, fatigued, dizzy and possibly cause you to faint.