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A well-balanced diet is the best way to maintain a strong immune system. But nutritional supplements are a convenient and easy way to ensure that nutritional needs are met.
Scientists have found that vitamin D is crucial to activating our immune defenses and that without sufficient intake of the vitamin - the killer cells of the immune system -- T cells -- will not be able to react to and fight off serious infections in the body.
 Vitamin D crucial to activating immune defenses.
Vitamin C is an essential micronutrient for humans, with pleiotropic functions related to its ability to donate electrons.
 Vitamin C and Immune Function
Quercetin, Inflammation and Immunity:
Quercetin, a flavonoid found in fruits and vegetables, has unique biological properties that may improve mental/physical performance and reduce infection risk.
 Quercetin, Inflammation and Immunity
Traditional herbal medicine provides several remedies for strengthening the body’s resistance to illness through effects on immune system components. This review article examines 3 popular herbal immune stimulants that are often of interest to cancer patients. Echinacea, a native of North America, is widely used to prevent, or provide early treatment for, colds.
 Immune System Effects of Echinacea, Ginseng, and Astragalus
Vitamin A (as Retinyl Palmitate), Vitamin C (Ascorbic Acid), Vitamin D3 (as D-Alpha Tocopheryl Succinate), Niacin (as Niacinamide), Vitamin B6 (as Pyridoxine HCI), Zinc (as Zinc Oxide), Selenium (as Selenomethionine), Bitter Orange Fruit Extract (40% Hesperidin), Quercetin (from Sophora Japonica Bud Extract), Astragalus Root 4:1 Extract, Turmeric Root Extract (95% Curcuminoids), Citrus Bioflavonoid Complex (from Orange, Lemon, Grapefruit Peel), Lactoferrin 95%
Other Ingredients: Vegetable Cellulose (Capsule), Magnesium Stearate, Silicon Dioxide, Microcrystalline Cellulose
Vitamin effects on the immune system:
Vitamins are essential constituents of our diet that have long been known to influence the immune system. Vitamins A and D have received particular attention in recent years as these vitamins have been shown to have an unexpected and crucial effect on the immune response. We present and discuss our current understanding of the essential roles of vitamins in modulating a broad range of immune processes, such as lymphocyte activation and proliferation, T-helper-cell differentiation, tissue-specific lymphocyte homing, the production of specific antibody isotypes and regulation of the immune response. Finally, we discuss the clinical potential of vitamin A and D metabolites for modulating tissue-specific immune responses and for preventing and/or treating inflammation and autoimmunity
 Vitamin effects on the immune system: vitamins A and D take centre stage