Mushrooms are a great source of B vitamins , including riboflavin , niacin , and pantothenic acid , which help to provide energy by breaking down proteins , fats , and carbohydrates . B vitamins also play a significant role in the nervous system. Pantothenic Acid : Helps with the production of hormones and also plays a vital function in the nervous system. Riboflavin Helps to maintain healthy red blood cells. Niacin Promotes healthy skin and makes sure the digestive and nervous systems function properly. Minerals Mushrooms are also a source of important. Selenium A mineral that works as an antioxidant to protect body cells from damage that might lead to heart disease, some cancers and other diseases of aging. It also has been found to be beneficial for the immune system and fertility in men. Many foods of animal origin and grains are good sources of selenium, but mushrooms are among the richest sources of selenium in the produce aisle and provide 8-22 mcg per serving.