Cramp Bark shows by its name the richly deserved reputation it has as a relaxer of muscular tension and spasm. It has two main areas of use. Firstly in muscular cramps and secondly in ovarian and uterine muscle problems. Cramp bark will relax the uterus and so relieve painful cramps associated with periods (dysmenorrhoea). In a similar way it may be used to protect from threatened miscarriage. Its astringent action gives it a role in the treatment of excessive blood loss in periods and especially bleeding associated with the menopause. The New Holistic Herbal by David Hoffmann Pg. 194