The innate (or natural) immune system is our first line of defence. Micro-organisms are in the air we breathe & the food we eat, so our epithelial surfaces (skin, respiratory tract, gastro-intestinal & genitourinary tracts) are continuously exposed. Our natural immunity helps defend us against these invaders. The main body of innate immune cells lie alongside the gut, & are called GALT (Gut-Associated Lymphoid Tissue). Research indicates that beta glucan supports the GALT & this in turn helps work with the body to support the entire innate immune system. When choosing a beta glucan food supplement, therefore, we recommend you should look for a company with a substantial track record of product testing. Glucasan®+ has been developed in Germany in conjunction with the Institute of Biotechnology at the Technical University of Berlin & has been shown in independent tests to outscore other beta glucan supplements.