Plum Fruit Extract sour in flavour, warm in nature, and tropistic to the heart, lung and kidney channels. Being warm and moist in nature, it has all the five kinds of taste, while the sourness is the dominant. So it functions mainly for astringency of preserve essence and in benefit as well, serving to astringe the lung in the upper-jiao and preserve essence in the lower-jiao, replenish Qi internally and consolidate the superficies externally. It is used to treat various syndromes of incessent and excessive loss of body essence due to deficiency. After all, as an astringent and being weak in nourishing potency, it is often used together with tonics to treat both the primary causes and the symptoms of a disease at the same time.