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Selenium is the most important mineral for the immune system and the liver to function at their optimal level; indeed without adequate selenium in your body, your immune system and liver will remain vulnerable to attack.
Selenium is a component of metal alloys, where it improves machinability of the final material and often replaces the more toxic metal lead. Though excessive quantities of selenium can be toxic, the element is also an important micronutrient, as it is a necessary cofactor for several enzymes.