By eHow Business Editor
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The uterine lining, or endometrium, is composed of the cells that line the womb. This lining thickens each month in preparation for a possible pregnancy. But some women have a lining that is too thin, causing skipped menstrual cycles or difficulty in getting pregnant. One way to address these issues is to thicken the uterine lining with the help of progesterone therapy.
eHow Business Editor