The drug only appears to work for women who have a specific problem - a thin lining of the uterus.
Doctors believe it may also act to increased blood flow to the uterus. This would increase the thickness of the uterus lining and boost the chances that the embryo could attach and develop successfully.
PS: Sticking my hands up & telling you I'm trying it!! Based on "This would increase the thickness of the uterus lining and boost the chances that the embryo could attach and develop successfully. "