There are some great books out there by Dr Normal Walker (lived to late 90's) who was one of the major mover & shakers of the juicing movement in approximately the 1940's. His books go into what to juice for what ailment. Alas, I have lost my book and need to order another since I just started juicing again in the last week. But if my memory serves me correctly carrot and beets are good for that area. I know this combination is supposed to help women with menstruation.
Just a note: there are a lot of juicing books out there but my interest is only in the ones that tell which juice is good for which ailment.