Your immune system is like an amazing, intelligent second brain with the unique ability to identify foreign compounds and to quickly produce specific defenses. Your immune system, always thinking up defensive strategies, uses a wide variety of cells and biochemicals to get the job done. It uses T-cells, B-cells, macrophages and natural killer cells. Some of the work takes place in your blood stream, some in your respiratory tract and some in your gastrointestinal tract. The Source Naturals® Wellness Family™ and other immune support products are formulated with a powerful combination of herbs, antioxidants, vitamins, and minerals to boost your well-being and support multiple body systems critical to your winter wellness.