Selenium
Selenium is an essential micronutrient needed for the health
of our body. It is synergetic with vitamin E, which means
these two nutrients improve one another’s efficacy when
combined, delivering powerful antioxidant properties. Selenium
is a cofactor for the reduction of antioxidant enzymes such
as glutathione peroxidases and thioredoxin reductase. It plays
a role in the functioning of the thyroid gland by participating
as a cofactor for thyroid hormone deiodinase. Deiodinase is
an enzyme important in the action of thyroid hormones.
A few recent studies have linked selenium deficiency to
cancer. Dietary selenium has been shown to prevent chemically
induced carcinogenesis in many rodent studies. Selenium may
help prevent cancer by acting as an antioxidant or by enhancing
immune activity, or both. Selenium is necessary for a healthy
immune system, heart and blood vessels.
Selenium deficiency can also lead to a weakening of the heart
referred to as Keshin disease. It can also lead to Kashin–Beck
disease, a condition described as causing atrophy, deterioration
and necrosis of bone and cartilage tissue. Although selenium
deficiency is rare, it is vitally necessary to include in
our daily diets.
The richest dietary source of selenium is Brazil nuts. This
trace element can also be found in lobster and crabmeat, other
nuts, apples, cereals, egg, meats and fish.
Health benefits of selenium
- Interacts with Vitamin E
- Powerful antioxidant that protects the cells from the damage caused by free radicals
- Assists in cell growth
- Needed for healthy immune system
- May fight or prevent certain types of cancer
- Helps maintaining healthy heart and blood vessels
Recommendations
RDI/AI – 55 mcg per day
UL – 400 mcg per day
Principal Author: M. Ofiyeva
Date of Initial Publication: 07/05/2007
Last Updated: 09/30/2007
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