Astragalus has been used for centuries in traditional Chinese medicine in combination with other herbs. Its root is used for health care purposes. Commonly combined with other herbs, astragalus has been promoted as a dietary supplement for many conditions, including upper respiratory infections, allergic rhinitis (hay fever), asthma, chronic fatigue syndrome, and chronic kidney disease, among others. It’s also promoted to strengthen and regulate the immune system. Topical use (application to the skin) of astragalus is promoted for improving blood flow and speeding wound healing.