Vitamin C, citrus bioflavonoids and zinc serve as a powerful foundation for overall health by supporting immune system function. Vitamin D receptors are found on a number of immune cells, including lymphocytes and macrophages. As a result, vitamin D supports healthy immune cell activation. Elderberry and lemon balm extracts offer immune enhancing anthocyanins, flavonoids and polyphenols. Polysaccharides from arabinogalactan, aloe and maitake provide complementary support for immune cell function and healthy immune mediator activity. Hesperidin plays the important role of maintaining healthy histamine release. In order to maintain a healthy immune system during periods of occasional physical or mental stress, astragalus and eleuthero have been added for their adaptogenic potential.