Selenium

Selenium (an antioxidant mineral) is part of the enzyme glutathione peroxidase, which is involved in protecting body tissues from free radical damage.

Without this mineral, normal growth and fertility would not occur, the liver would not function normally, important hormone production would not take place, and the immune system would not fully function. Its presence in the body is essential for healthy hair and skin, and is needed to maintain normal eyesight. There is now evidence that selenium may help protect against prostate cancer. A selenium deficiency weakens the immune system, thereby predisposing the body to an array of diseases.

As with many other micro-minerals, selenium levels in food are related to the amount of selenium in the soil where food is grown. Selenium is found in plant foods such as citrus, whole grains, and Brazil nuts.