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SeleniumIn addition, the mineral is needed for the proper functioning of the immune system and for the production of prostaglandins, which affect blood pressure and inflammation in the body. From anti aging perspective, also important is to note that, according to research, low levels of selenium may worsen atherosclerosis, which means plaque buildup in arteries which can lead to heart attack and/or stroke and can lead to premature aging. Selenium deficiencies have also been linked with certain types of cancer. It has been suggested that much of the benefits of selenium are related to its role in the production of the enzyme glutathione peroxidase. This enzyme is responsible for detoxification in the body. Dietary sources of selenium include brewer's yeast and wheat germ, liver, butter, fish (mackeral, tuna, halibut, flounder, herring, smelts), shellfish (oysters, scallops and lobster), garlic, whole grains, sunflower seeds, and Brazil nuts. 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