Beta glucan is a natural long-chain polysaccharide molecule purified from cell walls of baker’s yeast. Beta 1, 3-D glucan is an intensely purified, biologically active complex of beta glucans. Beta 1, 3-D glucan is readily taken up and converted in the body into a form which is specific to a site on all immune cells that have a CR3 receptor, e.g. macrophages, neutrophils, eosinophils, monocytes, and NK cells. These immune cells make up a large part of the immune system’s main defense mechanism. Technically, beta 1, 3-D glucan is a poly-branched, poly-glucose complex fiber-like particle that when converted, yields a biologically active beta glucan that is specific to immune cell receptors CR3, mac-1, CD11/CD18.