Lepidium meyenii or Maca is an herbaceous biennial or annual plant native to the high Andes of Peru. Maca's high concentration of proteins and vital nutrients increase energy levels and enhance fertility. Small-scale clinical trials performed in men vital progenix have shown that maca extracts can heighten libido and improve semen quality. This supplement has also been used for hormone replacement therapy and to help overcome depression. Maca helps to overcome fatigue, raise sexual energy levels, reduce stress and increase sexual stimulation.