From the Manufacturer:
Astragalus is a tonic herb from the legume family. It is indigenous to China and has been used as a preventive health tonic in Traditional Chinese Medicine since ancient times. The botanical name of Astragalus is: Astragalus membranaceus. Astragalus is one of the herbs known to stimulate the body’s natural production of interferon. It is known as a "Chi" tonic or replenisher. Chi is a concept in Chinese Medicine of the body’s “Vital Life Energy”. Astragalus is suitable for long-term use as an important aid in supporting the body's natural defense system