An adaptogenic plant, which means it gives your body the ability to adapt to or resist what's going on in and around it, like anxiety, stress, and depression. It packs high levels of iron and iodine to promote healthy cells and to help keep your metabolism on track. Its big doses of potassium help digestion and make muscles happy. Maca is also rich in calcium, amino acids, vitamins, and minerals. It is believed to rev up sex drive in men and women, boost sperm count, improve erections, and ease menopausal symptoms.  Caution If you're on blood thinners, maca may not be right for you. It has so much vitamin K -- which helps your blood form clots -- that it may counteract your medication. Ditto that for men with elevated blood PSA (prostate specific antigens), who should stay away from maca. The plant’s extracts might act like estrogen, so avoid it if you have hormone-sensitive conditions like breast, uterine, and ovarian cancers or endometriosis.