Longan commonly known as Gui Yuan in chines, is the valuable specialty in the tropical area. And historically it was well known that there was Gui Yuan in the South and Ginseng in the North. The longan fruit is rich in nutrition, been loved since the ancient times and treasured as the valuable tonic, so we can see its tonic function has been recognized for a long time. Its nature is sweet and neutral, good for the heart and spleen, benefiting of the blood and brain, and tranquilizing the nerves. It is often applied to treat the excessive contemplation, lack of effort, palpitation, severe palpitation, insomnia, forgetfulness and other disorders. In south China, the puerpera basically have to eat dried longan, and even in ordinary time the women and the senior also apply it into boiled water and drink it.
