1.

Gui Yuan, also known as longan, is warm and sweet in nature, benefiting the heart and spleen, replenishing qi and blood; it has a good nourishing and tonic effect, and can be used for insomnia, forgetfulness, palpitations, vertigo and other conditions caused by deficiency of the heart and spleen, qi and blood.

2.

Because the previous fruit can not be stored, is not conducive to transportation, longan is always dried before shipping to the north, because longan is more produced in Guangxi (Gui), and round, so the northern people called cinnamon as cinnamon (I do not know if it is not a taboo to say that the dragon in the feudal era, so can not be called longan, so the official name (the north) is also called cinnamon), so they do not know the cinnamon! The original form is longan.