White Oak Bark is a powerful astringent that has been used for centuries to control diarrhea, internal and external bleeding, excessive menstrual flow, nosebleeds and hemorrhoids. It is also a potent antiseptic that has helped to control bacterial invasion and infection and has been employed to relieve vaginal and bladder infections, among others. White Oak Bark's anthelmintic qualities help to destroy and expel parasites and intestinal worms.