Astragalus root has been used as one of the primary immune boosters in China for many centuries. It is also known as milk vetch root, huang-qi and bok kay. Astragalus herb is an adaptogen, that is, it has a balancing effect on bodily functions. In China, it is considered a Qi tonic. Traditionally, this wonderful herb is used as a Chi (life force) tonic and energy tonic and may be used to stimulate immune function, improve circulation, prevent colds and flu, increase energy, alleviate acute conditions, cleanse liver and kidneys, strengthen digestion, balance blood pressure, and benefit degenerative disorders. Some of the known active components include flavonoids, alkaloid, monosaccharides, polysaccharides, free amino acids, trace minerals (including selenium, zinc, iron, etc) and polyphenols.