Natrol Immune Boost featuring EpiCor Description: Immune Survival Kit All-Season Defense Starts Working As Fast As 2 Hours This advanced formula features EpiCor, which starts to increase the body's Natural Killer (NK) cell activity as fast as 2 hours after intake. NK cells are a type of white blood cell that are vital to your natural resistance. In addition, Immune Boost helps increase IgA, an antibody found in mucous membranes. The formula also supports the function of B-cells and T-cells, as well as Interferon. EpiCor is an immune-promoting yeast complex - a Super Food for immunity health. EpiCor has been the subject of several clinical studies that show that it promotes immune function. Free Of Wheat, milk, egg, soy, glutens, artificial colors, artificial flavors, added sugar, and preservatives. Disclaimer These statements have not been evaluated by the FDA. These products are not intended to diagnose, treat, cure, or prevent any disease.