NOW&ampreg; Beta-1,3/1,6-D-Glucan (Beta-Glucan) is a bioactive carbohydrate derived from the cell wall of Saccharomyces cerevisiae, commonly known as Bakers' yeast.&ampnbsp; Scientific studies have shown that Beta-Glucan supports healthy immune function through its ability to stimulate macrophage activity.&ampnbsp; NOW Beta-Glucan&ampreg; is blended into a synergistic base of Maitake Mushrooms for added support.*&ampnbsp;