Angelica sinensis Blood purifier and woman's herb In herbal medicine, the primary use of dong quai is as a uterine tonic, reducing menstrual pain and reducing disagreeable symptoms of menopause. Dong quai does not stimulate the production of estrogen. The herb is used in tonics for both sexes to relieve pain caused by neuralgia, poor circulation, and arthritis. It is thought to strengthen the immune system by increasing the production of white blood cells, assisting the liver in riding the body of toxins. Parts Used Root.