Research shows that astragalus has immunostimulatory properties. It increases the number of stem cells in bone marrow and lymph tissue and encourages their development into active immune cells. It appears that this herb helps trigger immune cells from a "resting" state into heightened activity. One study showed that astragalus increases the production of interferon-an important component of the immune system's defensive network. When combined with interferon, astragalus root helped promote and maintain respiratory health in study group participants.
Astragalus also enhances the body's production of immunoglobulin and stimulates macrophages. It can help activate T cells and natural killer cells.
Several studies also show that astragalus proffers heart-protecting effects, including protection against oxidative damage. The flavonoids, saponins and polysaccharides found in astragalus root help minimize free radical damage on membranes.
