Angelica sinensis extract - a traditional Chinese herbal Extract for the symptoms of PMS. In Asia, dong quai's reputation is perhaps second only to ginseng. Predominantly regarded as a 'female' remedy, dong quai has been used in such conditions as painful menstruation, and for menopausal symptoms. Scientific investigation has shown dong quai produces a balancing effect on estrogen activity and a tonic effect on the uterus, normalising uterine contractions. Dong quai is generally quite safe. However, because it does contain photoreactive substances, overexposure to sunlight should be avoided.