Selenium is a trace mineral that is essential for good health. The daily recommended dietary intake of selenium is 55 micrograms for males and females, according to MedlinePlus. Natural sources of selenium include Brazil nuts, milk, diary products, tuna, cod, beef, poultry, eggs, pasta, walnuts, cheese, brown rice, enriched white rice, brewer's yeast, fortifed breads and cereals. Selenium performs several functions in the body.
Antioxidant
Selenium assists in the production of special proteins known as selenoproteins, which are antioxidant enzymes that help prevent cell damage from free radicals, according to the Office of Dietary Supplements. Some researchers believe that selenium is useful in helping protect the body from certain cancers. Current studies show that cancer deaths are less common in people with high levels of selenium in the blood.
Immune System
Selenium supports the functions of the immune system. The immune system helps protect the body against microorganisms such as bacteria, viruses and fungi. Selenium helps protect the body from poisonous effects of harmful substances such as heavy metals, according to MedlinePlus. Selenium also stimulate antibodies production after you receive a vaccination.
Thyroid Function and Fertility
Selenium helps regulate thyroid function, according to the Office of Dietary Supplement. Thyroid gland produces thyroid hormones that help control metabolism and other important processes in the body. Lack of selenium may cause hypothyroidism. Selenium is also important for fertility in men. Selenium also helps the testes produce healthy sperms, according to MedlinePlus.
Selenium Deficiency
Selenium deficiency may occur in people who rely on intravenous feedings as their only source of nutrition. Selenium deficiency may also occur in patients with severe digestion and absorption problems. Low levels of selenium disease may lead to Keshan disease, a condition that affects heart muscles, according to the Office of Dietary Supplements.
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