Native to the Peruvian mountains, the maca plant has been used for centuries to boost fertility. Today, research suggests that its root can improve sexual desire. Phytonutrients in the plant may raise sperm count and sexual function as well. Maca root is often sold as a powder. It has a nutty, earthy flavor. You can add it to your yogurt, smoothies, salads, soups, or baked goods.