http://www.macasex.com/Maca Root is believed to help sexual performance and act as an aphrodisiac that boosts libido in both men and women. Chemical research has demonstrated that Maca Root contains a chemical called p-methoxybenzyl isothiocyanate, which has reputed aphrodisiac properties.
Because Maca is thought to balance hormonal activity, it is believed to be useful in cases of sterility and other reproductive and sexual disorders. In men, it is believed to help treat male impotence and erectile dysfunction and may, in fact, increase seminal volume and sperm motility. There are also claims that Maca especially enhances sexual performance and endurance..
I saw a bit about this on TV [an investigative report, not a commercial] the other night. Apparently it is common for women in Peru to use Maca root to increase libido. When asked if it works, one women commented, "It will make Chinese fireworks in your pants!".
It appears that this has been shown to be effective in mice, but it hasn't been tested in humans.
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