In some women, maca powder works to normalize hormones even in cases of complete hysterectomy.
http://www.greenwillowtree.com/Page.bok?file=peruvianmaca.html
Women who have had complete hysterectomies, or who are extremely thin, usually have a more difficult time in using only maca to supply their hormonal needs, but in many cases this is still possible. Hugo Malaspina, MD, a respected doctor from Lima, describes the case of a patient who had had her ovaries removed. The woman was taking HRT but still did not feel well. When examined, she had a very low estrogen level despite the hormone replacement therapy. Two months after she began taking maca, the patient was re-tested and showed adequate estrogen levels. "Maca enabled the adrenals to make sufficient hormones to avoid symptoms," commented Dr. Malaspina.
More on maca:
http://www.spiritofhealthkc.com/portfolio/questions-and-answers-about-maca/