Vitamin A: An essential micronutrient that plays a central role in immune function. In a review of literature, Scrimshaw et al (1968), the researchers concluded the lack of vitamin A was observed in illnesses more than any other nutrient. Vitamin C: A powerful antioxidant that helps protect certain white blood cells from toxic compounds they produce in their fight against germs. Phagocytes and t-cells need vitamin C to perform their tasks in the immune system. Vitamin E: A fat-soluble nutrient that acts as an antioxidant to help protect cells from damage caused by free radicals. The body needs vitamin E to boost its immune system so that it can fight off unwanted invaders that cause illness. Zinc: A micronutrient that is important for the maintenance and development of immune cells in both the innate and adaptive immune systems. Zinc is essential for normal development of neutrophils and natural killer cells; phagocytosis, intracellular killing and cytokines production; the growth and function of T and B cells; DNA synthesis and RNA transcription; cell division and cell activation. Selenium: A mineral with antioxidant activity, which is crucial for health and proper functioning of the immune system. Selenium has antioxidant activity that helps lower oxidative stress in the body, which enhances immunity. Beta Glucans: Sugars that are found in the cell walls of bacteria, fungi, yeasts, algae, lichens, and plants, such as oats and barley. Beta Glucans are powerful immunomodulatory agents, which trigger multiple events that help regulate the immune system and make it more efficient. Astragalus: Used in Chinese medicine for centuries to boost the immune system. Astragalus is an herb that comes from a legume. It is known to have antioxidant activity that inhibits free radical production. Elderberry Extract: From the elderberry fruit, which has been used since ancient civilization to enhance the immune system.