Selenium is a trace elements present in a large number of foods (poultry, eggs, shellfish, whole grains, brown rice, and sunflower seeds) and water. The advertised benefits of the nutrient include preventing certain types of cancer, enhancing the immune system, regulating thyroid activity repairing damaged DNA, and fighting against free radicals. The combination of Selenium and vitamin E may be effective in reducing inflammations and more potent in preventing conditions associated with aging. Very high doses of this substance may cause nausea, low energy, and irritability.
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