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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.
Best Answer: One of the main functions of gut flora is protection. The friendly and rapidly-replicating gut microbes out-compete pathogens. They inhibit the growth of pathogenic bacteria by secreting substances that are toxic to non-indigenous bacteria. The natural gut flora also secrete vitamins B12 and K as metabolic by-products.