Astragalus root is most commonly used to boost the immune system. According to the University of Maryland Medical Center, this herb is considered to be an adaptogen, or a substance that wards off stress and fatigue. More than 2000 years ago, astragalus was mentioned in the Chinese medical classic "Shen Nong Ben Cao Jing" as a stimulant of Chi, or vital energy. WebMD.com reports that astragalus is used to treat respiratory conditions, although further scientific research is required to validate its effectiveness.
The nonprofit group Plants for a Future reports that astragalus root might lower blood sugar, thus helping people with diabetes.
According to the University of Maryland Medical Center, astragalus might lower blood pressure. This institution cites a study conducted in China in which astragalus root promoted significant improvement in patients with severe heart disease.