Mushrooms are a good source of selenium and copper.
In addition, a properly working immune system and the production of thyroid hormones both depend on this important mineral. Selenium has also been shown to have reproductive health benefits for men and women. Copper works with iron to produce red blood cells and keep body tissues properly oxygenated. Mushrooms are one of the best sources of riboflavin. One serving, about five medium mushrooms, is also a good source of niacin and pantothenic acid.