Women will collect menstrual blood for 3 cycles and will be eligible to enter the treatment phase if in two of the three pre-treatment cycles the measured menstrual blood loss (MBL)is >80ml. The mean of these baseline MBL measurements will be the comparator for the efficacy treatment measurement. Iron studies (serum ferritin, Fe and transferrin) will also be measured pre and post treatment and related to women's assessment of their quality of life measured on a validated questionnaire.