Dong quai, also known as Angelica sinensis, is a perennial herb native to China, Japan, and Korea. The root of the plant is used for medicinal purposes. Dong quai is considered to be a tonifying herb and is commonly used in traditional Chinese medicine to balance female hormones and to help alleviate symptoms of menopause. It has been traditionally used to help regulate menstrual cycles and to help reduce menstrual cramps. Dong quai is also believed to have anti-inflammatory properties and may help to reduce pain and inflammation. It's also been traditionally used to improve blood circulation and to help boost the immune system.