What natural ingredients in maca promote its reputed sex-enhancing effects? In-depth analysis of maca conducted in 1998 by Dr. Qun Yi Zheng and his colleagues at PureWorld Botanicals shows that maca contains about 10 percent protein, almost 60 percent carbohydrate, and an assortment of fatty acids. These ingredients are common and nothing special. But the investigators also discovered two groups of novel compounds, the macamides and the macaenes. These agents are believed to be directly responsible for maca's sex-boosting powers.