Helps Promote All-Season Defense. Starts Working as Fast as 2 Hours. Guard Your Immunity. Take Daily to Promote Immunity. Features: EpiCor', Vitamins C & D3, Selenium'& Zinc. Safe for Adults'& Children 9 Years & Older. Just One Daily. Natrol' Immune Boost. 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 & T-cells, as well as Interferon. '. Some Basics About Immunity. The immune system is comprised of highly specialized white blood cells. NK cells are a major component of the body's first line of defense that engulf and destroy foreign invaders. B-cells make antibodies that tag foreign invaders. T-cells identify and attack targeted invaders. In addition, Interferon enhances the c

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