What is Longan? What is Longan good for? All fruits are good for health but some have a better a nutritional value as compared to others. Filled with essential nutrients, Longan fruit acts as a remedy for various health problems. Some of the Longan Benefits are: anti-inflammatory properties, healthy mucus membrane, prevents oral cavity cancer, prevents anemia, prevents cases of morning sickness, prevents lung cancer, skin rejuvenation, treatment of colonic diseases and anti depressant and its general health benefits are: anti oxidant properties, anti-inflammatory properties, digestive aid, gives you energy and suppresses arthritis. It can also be used for nourishment of skin and hair. Some skin benefits are reduces wrinkles and skin rejuvenation and hair benefits are not available. If this fruit is consumed in excess or if you are intolerant, you might experience some side effects or allergies. Longan side effects are: mouth irritation and weight gain and its allergy symptoms are itching, swelling of mouth tongue or lips and tingling sensation in mouth. Keep reading to get all the necessary information about Longan.