Longan, also known as Guiyuan, is a specialty fruit of southern China. It is rich in sugar and many kinds of vitamins and has the effect of nourishing the heart and spleen, nourishing blood and calming the mind. Longan is processed into dried cinnamon. It has always been regarded as a precious tonic. Dried longan can be used to make tea or sweet soup, dried longan is a common tonic, or eaten directly, or used to make tea, soup, sugar water taste good. It nourishes the heart and blood, calms the mind and fixes the spirit, and has a significant tonic effect. It is hot in nature and suitable for people with a cold constitution.
Dried longan is rich in vitamins and phosphorus, which is good for the spleen and brain, so it is also used in medicine. It has high total sugar content and is rich in vitamins, retinol, and nicotinic acid. In addition, it contains crude protein, vitamins and inorganic salts, which are essential nutrients for human. 
It should be noted that when using Guiyuan, it is necessary to use it in a reasonable dosage according to the specific condition and the advice of herbal medicine