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Once placed on the endangered plant list, it is now grown on thousands of acres as a commercial product. Maca has been used by Peruvian consumers for many centuries, since before the time of the Incas. The Incas found maca so potent that they restricted its use to their royalty's court. Scientist Gustavo Gonzales of Peru's Cayetano Heredia University, who led what the scientists say is the world's first study into maca's effect on humans, told a news conference the three-month trial involving 12 volunteer men pointed to an 180-200% lift in libido and up to a doubling of sperm production. To be consistent with Peruvian usage levels one should take 3,000-5,000mg per day of maca, but one can certainly take more. Toxicity studies conducted on maca in the U.S. showed absolutely no toxicity or adverse pharmacologic effects.
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