The wealth of nutrients in longan fruit include vitamin C, the B complex vitamins and other essential minerals like potassium, copper, zinc, magnesium, phosphorus, iron, calcium and manganese. This juicy fruit also contains certain antioxidant polyphenols like gallic acid, corilagin, and ellagic acid that are extremely beneficial for increasing the overall wellness of the body. Here are the top 6 benefits of longan fruits.