It is used for almost every gynecological complaint from regulating the menstrual cycle to treating menopausal symptoms caused by hormonal changes. Dong quai is frequently used by the Chinese as a strengthening treatment for the heart, spleen, liver and kidneys. Both men and women use the herb as a general blood tonic. Dong quai contains vitamins E, A and B12. Researchers have isolated at least six coumarin derivatives that exert antispasmodic and vasodilatory effects.
Antispasmodics are a remedy for menstrual cramps.
The essential oil in dong quai contains Ligustilide, butylphthalide and numerous other minor components. Ferulic acid and various polysaccharides are also found in dong quai's root. These elements can prevent spasms, reduce blood clotting and relax peripheral blood vessels. Research has shown that don quai prouces a balancing effect on estrogen activity. Modern treatments prescribe the herb to combat PMS and to help women resume normal menstruation after using birth control pills.