Maca (Lepidium meyenii) is a root-like vegetable shaped like a turnip. It grows at 12,000 feet above sea level and is only found in the high Andes of Peru and Ecuador.
For more than two millennia, native Peruvians have used maca root as food and medicine to promote fertility, endurance, energy, vitality, and sexual virility.
Maca is a nourishing food for the endocrine system, aiding both the pituitary, adrenal, and thyroid glands (all involved in hormonal balance.) Maca has the ability to affect key hormones in both women and men without containing hormones itself.
Maca helps to stimulate and nourish the pituitary gland, acting as a tonic for the hormone system. When the pituitary gland functions optimally, the entire endocrine system becomes balanced, because the pituitary gland controls the hormone output of the other three glands.
In women, maca works by controlling estrogen in the body. Estrogen levels that are high or low at the wrong time can keep a woman from becoming pregnant or keep her from carrying to term. Excess estrogen levels also cause progesterone levels to become too low. Taking maca may help to increase the progesterone levels which are essential to carrying a healthy pregnancy.*
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http://natural-fertility-info.com/maca
If you have a short luteal phase the herb Vitex is great. Vitex has been found to help normalize ovulation and improve a short luteal phase.
Learn more here:
http://natural-fertility-info.com/vitex
I have read that the Cassava plant can cause multiples, but find nothing to back this up except a few women online saying they knew someone who swears this works. HHmmm..
Best Wishes!