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