Astragalus is an herb. The root is used to make medicine.
Astragalus is used for hay fever, diabetes, kidney disease, and many other conditions, but there is no good scientific evidence to support these uses.
There are several different species of astragalus. Some species contain a nerve toxin and have been linked to livestock poisonings. Some of these species include Astragalus lentiginosus, Astragalus mollissimus, and others. However, these species of astragalus are usually not found in dietary supplements used by humans. Most astragalus supplements contain Astragalus membranaceus.
How does it work?
Astragalus seems to stimulate and increase the immune system.