Herb Cistanche, one kind of rare medicinal herbs, is commonly used for deficiency of the Kidney as well as moistens and relaxes bowel. It was recorded as a top grade in the ancient medical herb encyclopedia Shengnong Bencao. In the encyclopedia it reads: “Herb Cistanche, sweet, mildly warm property, relieves 5 kinds of stresses and heals 7 kinds of wounds, reinforces the middle Qi. ” Chinese Materia Medica says: “Cistanche is an invigorator, but acts mildly, therefore its name implies easiness.” Chinese traditional doctor pointed out: Being a super tonic herb, Cistanche strengthens kidney. It fills marrow, moistens bowel, prevents aging. Cistanche is usually prescribed to treat impotence, spermatorrhea, emmeniopathy, amenorrhea, diarrhea caused by cold and lack, constipation etc. In the theory of Chinese traditional medicine, cognitive disorders are classified into two categories: “lack” and “solid”, with majority belonging to “lack”. Ancient Chinese doctors believed that the “lack” cases may be caused by weakening in kidney and heart-spleen. Therefore the treatment should focus on reinforcing the function of these organs. Cistanche benefits cognitive function, increases memory, prevents caducity. It is the first choice for treating cognitive disorders.