Selenium

Function

Has antioxidant properties and is associated with fat metabolism.

Overconsumption

The amount of selenium required to cause toxicity in humans is not known. Excess selenium intake can cause problems with the strength of teeth and the tooth enamel, and may cause hair and nail loss.

Deficiency

Keshan disease has been documented as being caused by a deficiency of selenium.

Sources

Fish, shellfish, red meat, grains, eggs, chicken, liver, and garlic