Selenium yeast tablets if taken in excess or long-term lifelong, will have certain side effects on the body. 1, will appear digestive and absorption dysfunction, selenium yeast tablets have laxative, promote the gastrointestinal tract peristalsis, promote the role of intestinal tube excretion. If you take too much of it, it will lead to secondary digestion and malabsorption of food, and the nutrients can not be absorbed by the body in time, and excretion and metabolism with feces adverse reactions and side effects. 2, selenium yeast tablets if you take too much, but also lead to liver and kidney side effects and side reactions. Because selenium yeast tablets are usually detoxified by the liver and excreted and metabolized through the kidneys, so if too much selenium yeast tablets are taken, there will be chronic impairment of liver and kidney function, and there will be chronic failure of liver and kidney function and other side effects occur.