Astragalus root (huang qi) has been used as a popular herbal tonic in China for many centuries. Some of the known active components include flavonoids, free amino acids, trace minerals and polyphenols.
The traditional medicine of East and South Asia takes astragalus root as a major component for it adaptogenic support, such as a defense against any kind of physical, spiritual and emotional stress and its ability to  support the inner power of the body, well known as qi.