The present invention relates to a composition and method for stimulating or enhancing the immune system in a human being. The composition comprises a mixture of Manapol, beta-1,3-D-glucan, arabinogalactin, elderberry extract standardized to about 30% anthocyanins, zinc gluconate and allicin. This composition, taken as a food supplement, is particularly useful against infectious diseases and acts as an anti-bacterial, anti-viral or anti-fungal agent.