According to Dr. Huynh Tan Vu, a specialist at the University Medical Center of Ho Chi Minh City, Branch 3, longan is a familiar delicacy to Vietnamese people and a valuable ingredient in traditional medicine.
Fresh longan pulp contains 77.15% water, 0.01% ash, 0.13% fat, 1.47% protein, 20.55% water-soluble nitrogen compounds, 12.25% sucrose, and vitamins A and B.
Dried longan pulp contains 0.85% water, 79.77% water-soluble substances, 19.39% water-insoluble substances, and 3.36% ash content. The water-soluble portion contains 26.91% glucose, 0.22% sucrose, and 1.26% tartaric acid. The nitrogen content is 6.309%.
Longan seeds contain starch, saponins, fats, and tannins. The black outer shell of the longan seed is scraped off, sliced thinly, and ground into a powder to be sprinkled on bleeding wounds, or mixed with oil and applied to burns.
Longan leaves contain quercetin, quercetin, and tannins. Longan leaves have a mild taste and are neutral in nature; they are effective in treating colds when taken in a decoction of 10-15g.
Longan is a valuable ingredient in traditional medicine.
Uses and dosage of longan
In Traditional Chinese Medicine, longan is a tonic for the blood, heart, spleen, and mind. Compared to jujube, longan is considered more effective in treating spleen-related ailments.
Longan fruit nourishes both qi and blood, and is effective in treating insomnia caused by excessive thinking, worry, restlessness, and anxiety.
Powdered longan seeds, called "le chau," are used to stop bleeding from wounds, reduce pain, promote faster healing, and prevent scarring (the powder is sprinkled on the wound).
The powdered peel of the longan fruit is used to treat burns. People suffering from colds, digestive disorders, or thick, slippery tongue coating should not eat longan. The daily dose is 9-10g in the form of a decoction or liquid extract.
According to ancient texts, longan has a sweet taste, a neutral nature, and acts on the heart and spleen meridians. It has the effect of nourishing the heart and spleen, enriching the blood, calming the nerves, and improving intelligence. It is used to treat blood deficiency causing forgetfulness, palpitations, and insomnia. People with bloating and poor appetite should not use it.
Longan is used as a medicinal ingredient with therapeutic effects.
The prescription includes longan and longan seeds.
To treat symptoms caused by excessive worry, anxiety, insomnia, or forgetfulness: Longan, jujube seeds (roasted), astragalus (extract), Poria cocos (each 4g), ginger 3 slices, red date one fruit. Decoction to be drunk hot.
Itchy sores between the toes: Remove the black outer shell from longan seeds, slice them thinly, dry them in the sun, grind them into a powder, and sprinkle it on the sores.
To treat symptoms of poor appetite, insomnia, and lethargy: Take 40g of deer antler extract and 50g of longan fruit. Boil the longan fruit in water. Chop the deer antler extract into small pieces and add it to the longan decoction. Heat until dissolved. Let cool, then slice into thin pieces. Take 10g of this extract before bed and 10g before breakfast.
Diarrhea due to spleen deficiency: Take 40 dried longan fruits and 3 slices of fresh ginger, decoct and drink.
Postpartum edema: Dried longan, ginger, jujube, Job's tears, Poria cocos, 10g each, decocted and drunk.
Anxiety, insomnia, forgetfulness : Cook 100g of longan pulp and 120g of glutinous rice into a porridge and eat.
Anemia, general weakness: Cook 10g of longan, 15g of lotus seeds, 10g of red dates, 10g of peanuts, and 30g of glutinous rice into a porridge. Eat once in the morning and once in the evening.
Nervous exhaustion: Take 15g each of longan, sour jujube seeds, and Euryale ferox seeds, boil them in water, and drink the decoction before going to bed.
Vomiting and belching : Take 7 dried longan fruits, burn them to ashes, grind them into powder, divide equally, and drink 3 times a day.
Bleeding due to injury: Crush longan seeds and apply them to the wound.
Longan has beneficial effects on the body; however, people should consult a doctor before using it as medicine to avoid harming their health.
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