NOW Foods Beta Glucans with ImmunEnhancer is a bioactive carbohydrate derived from the cell wall of Saccharomyces cerevisiae, commonly known as bakers' yeast. Scientific studies have shown that Beta-1,3/1,6-D-Glucan supports a healthy immune system through its ability to support the maintenance of several aspects of the body’s normal immune functions. ImmunEnhancer™, a high molecular weight polysaccharide extracted from the larch tree that has been studied for its ability to support a healthy immune response.