Longan, a tropical summer fruit from Asia and a close relative of lychee, is described as a “dragon eye” because of its appearance. When its thin brown peel is removed, it reveals translucent white flesh around a shiny black seed that resembles a pupil.
According to clinical medicine, longan extracts are rich in unique polyphenols that have been shown to improve brain function and memory, while helping protect nerve cells from oxidative damage and degenerative processes. The fruit also contains active compounds such as saponins and flavonoids, which are said to affect the central nervous system by regulating GABA receptors and balancing the HPA stress axis, helping the body relax and lowering cortisol levels.
The fruit is also presented as a strong source of antioxidants that neutralize free radicals, support blood vessel health and may reduce chronic inflammatory signs. In traditional Chinese medicine, the dried fruit, called Long Yan Rou, is considered a leading herb in the category of “nourishing heart blood,” and is used for weakness, chronic fatigue, rapid pulse and anxiety. It is also said to strengthen the spleen and stomach and improve energy extraction from food, which is why it is recommended in states of weakness or after childbirth.
Traditional Eastern practice also uses dried longan infusions for insomnia linked to intrusive thoughts, excessive worry or mental overload. The article gives a recipe of soaking 4 to 6 dried fruits in a cup of boiling water for 15 minutes, then drinking the infusion and eating the fruit about half an hour before sleep. It also mentions powder and capsule supplements, with a common powder dose of half a teaspoon to one teaspoon a day in warm water. The author warns that it is not suitable for people with diabetes or women with insulin resistance, is not recommended during pregnancy or breastfeeding, and those taking sedatives, antidepressants or sleeping pills should consult a doctor.
