Maitake mushroom is a powerful superfood for the immune system. Extensive scientific research is proving that Maitake may be the most effective immune-supportive mushroom of all. It is one of nature’s richest sources of beta-glucans, also known as “biological response modifiers,” for their powerful health-promoting potential and ability to activate the immune system. Maitake might be one of the most important immune foods available, making your quest to stay healthy, an easy one.