Progressive studies on biological activity of total flavonoids of Astragalus

Progresses in the studies on chemical constituents and bioactivities of total flavonoids of Astragalus (TFA) were systemically reviewed in this article. The results of studies on their bioactivities show that TFA has antioxidant and antitumor activities, and strengthen the immune system. Further biological studies on the species in total flavonoids of Astragalus are needed for better medicinal utilization.