MegaFood understands that we are constantly challenged by a barrage of immune-damaging factors. Supporting and activating the body's natural immune response has never been more important. Cellular theory and Immune research has developed specific methods of strengthening Immune response. Mega Food knows that it was discovered in the 1940's that yeast enhanced resistance to disease. In the 1980's researchers found that Beta Glucans in yeast were a broad spectrum enhancer of host defense mechanisms' that activated the body's immune response.