Benefits
Traditionally supports restful sleep
Longan fruit pulp has long been used in classical East Asian herbal formulas intended to calm the mind and support healthy sleep onset, and preclinical work shows extracts can modulate sleep-related neurochemistry in animal models.
Helps support mood and emotional calm
Long Yan Rou is a key ingredient in traditional formulas used to nourish the heart and spleen, which in modern terms aligns with supporting feelings of calm and balanced mood during periods of mental strain or overwork.
Provides antioxidant polyphenol intake
The fruit pulp supplies polyphenols such as gallic acid, corilagin, and ellagic acid that contribute antioxidant activity in laboratory assays, helping support the body's defenses against oxidative stress when consumed as part of the diet.
Supports cognitive and memory function
Preclinical models suggest longan-derived polyphenols may help protect neurons from oxidative insults relevant to age-related cognitive decline, providing a traditional rationale for its use in memory-supporting formulas.
Mechanism of action
Polyphenol antioxidant activity
Longan polyphenols including gallic acid, ellagic acid, and corilagin scavenge reactive oxygen species and inhibit lipid peroxidation in vitro and in animal brain homogenates, contributing to antioxidant tone in neural and vascular tissues.
Modulation of sleep-related neurotransmission
Animal studies suggest longan flower and fruit-derived extracts can influence the serotonin-melatonin axis and GABAergic signaling, supporting falling asleep and total sleep time in murine models when combined with other traditional sleep herbs.
Neuroprotection against oxidative neurotoxicity
In rodent models of MPP+-induced dopaminergic neurotoxicity, longan flower water extract dose-dependently attenuated neuronal damage and lipid peroxidation in the nigrostriatal system, indicating a potential neuroprotective mechanism.
Clinical trials
Rodent study using oral administration of longan flower water extract (125–500 mg/kg/day) followed by MPP+ challenge.
Rats with chemically induced nigrostriatal dopaminergic neurotoxicity.
Oral longan flower water extract dose-dependently inhibited lipid peroxidation of brain homogenates and attenuated MPP+-induced damage in the nigrostriatal dopaminergic system, suggesting neuroprotective activity that may be relevant to age-related neurodegeneration.
Pentobarbital-induced sleep model in mice using a combination including Dimocarpus longan with other traditional sleep botanicals.
Adult mice in controlled sleep behavior testing.
The combined longan-containing formulation prolonged sleep duration and shortened sleep latency in mice, with mechanistic data implicating GABAergic signaling, supporting traditional use of longan-containing formulas for sleep.