Another herb that is becoming well known in the western herbal community for its ability to enhance the immune system, astragalus is considered an energy tonic.  It enhances the protective, or defensive, chi in the body that helps fight off colds and flu.  It improves circulation in the muscles and skin, regulates blood pressure and blood sugar, boosts immunity, and promotes the healing of wounds.  It's frequently prescribed for individuals with heart problems and helps boost immune function in cancer patients undergoing radiation and chemotherapy.  It's also used in controlling mild forms of diabetes.

Ginseng
He Shou Wu (Polygonum Multiform)
Epimedium
Angelica Sinensis (Dang Gui, Tang Kwei)
Astragalus
Chinese Wolfberry
Schisandra
Eucommia
Rehmannia