Selenium is considered a powerful antioxidant, especially when used in combination with Vitamin E, and can be found in trace amounts all over the body. The highest concentrations are found in the kidneys, liver, spleen, pancreas and the testes of men. The benefits of Selenium are very similar to that of Vitamin E. Selenium helps to rid the body of free radicals and harmful toxins, relieves the symptoms of inflammatory diseases, boosts the immune system, reduces the risk of heart disease and slows the aging process.