Beta Glucans, a type of fiber derived from yeast, cereal grains, and certain mushrooms, is known to help boost the immune system. Many studies have shown the benefits of beta glucans in helping people with a variety of health conditions including cholesterol and various others. NSC MG Beta 1,3/1,6 Glucan Supplements (in comparison to the larger globular or reaggregated particulate glucan in most competitor products) is indicated by research to be more potent in boosting immune response.