Astragalus membranaceus - A traditional Chinese herb, Astragalus does its best work when boosting a vulnerable immune system, rather than treating a raging infection, where it is best to leave to other herbs such as Echinacea. The Chinese say that Astragalus strengthens Qi (deep energy), and who doesn’t need a touch-up in the Qi department from time to time? It will also improve vitality and reduce fatigue.