Home Ingredients Euphoria longana (Longan Fruit Pulp Extract)
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Euphoria longana (Longan Fruit Pulp Extract)

Dimocarpus longan (syn. Euphoria longana)
Evidence Level
Limited
2 Clinical Trials
4 Documented Benefits
2/5 Evidence Score

Euphoria longana, more commonly classified today as Dimocarpus longan, is the longan fruit native to southern Asia. Its dried fleshy aril, known in Traditional Chinese Medicine as Long Yan Rou or 'dragon eye flesh,' has been used for centuries to nourish the heart and spleen, calm the spirit, and support sleep, memory, and emotional balance in classical formulas. The pulp contains polyphenols, polysaccharides, gallic acid, ellagic acid, and corilagin that have been characterized in preclinical pharmacology studies for antioxidant, anti-inflammatory, sleep-supportive, and neuroprotective activity. Human clinical evidence is limited and traditional use dominates, so longan is best viewed as a supportive botanical within broader sleep, mood, or cognitive formulations.

Studied Dose Dried longan aril typically 6-15 g/day as a decoction or in formulations; standardized extract doses not yet well established.
Active Compound Polyphenols (gallic acid, ellagic acid, corilagin), polysaccharides, and flavonoids concentrated in the dried fruit pulp (aril).

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.

Supported by Trial 2, Trial 1

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.

Supported by Trial 2

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.

Supported by Trial 1

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.

Supported by Trial 1, Trial 2

Mechanism of action

1

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.

2

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.

3

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

1
Preclinical neuroprotection model

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.

2
Combined botanical sleep model in mice

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.

Side effects and drug interactions

Common Potential side effects

Generally well tolerated as a food but may cause mild digestive upset when consumed in large amounts.
High intake of sweet dried longan adds significant sugar and calories to the diet.
Allergic reactions to the fruit have been reported rarely.
Traditional sources caution against use during acute infections with fever.

Important Drug interactions

May theoretically add to sedative effects of benzodiazepines and other CNS depressants.
Concurrent use with hypoglycemic medications could affect blood sugar response.
Caution with anticoagulants is reasonable given antioxidant polyphenol content.

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Frequently asked questions about Euphoria longana (Longan Fruit Pulp Extract)

What is longan (Euphoria longana) used for?

Longan fruit (Euphoria longana, or Dimocarpus longan), known as long yan rou in Chinese medicine, is used as a nourishing tonic for the heart and spleen, traditionally for sleep, calm, memory, and as a blood-building food.

What is longan good for?

It is traditionally used to calm the mind and support sleep and memory, ease worry and palpitations, and nourish the blood, often in formulas for insomnia and fatigue. It is also eaten as a sweet, nutritious fruit.

How much longan should I take?

The dried fruit is eaten or used in decoctions and formulas; follow product or practitioner guidance. It is a food-grade tonic.

Is longan safe?

As a food and gentle tonic it is generally very safe and well tolerated. It is sweet, so those managing blood sugar should be mindful of the dried fruit's sugar content. It is a pleasant, food-based calming tonic.

What is Euphoria longana?

Euphoria longana, more commonly classified today as Dimocarpus longan, is the longan fruit native to southern Asia. Its dried fleshy aril, known in Traditional Chinese Medicine as Long Yan Rou or 'dragon eye flesh,' has been used for centuries to nourish the heart and spleen, calm the spirit, and support sleep, memory,…

What is Euphoria longana used for?

Euphoria longana is researched primarily for Sleep Health, Stress & Anxiety, and Cognitive. 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.

What is the recommended dosage of Euphoria longana?

The clinically studied dose is Dried longan aril typically 6-15 g/day as a decoction or in formulations; standardized extract doses not yet well established. Always follow the product label and check with a healthcare provider for personal advice.

Is Euphoria longana safe, and does it have side effects?

For most healthy adults, Euphoria longana is well tolerated at studied doses. Reported effects can include: Generally well tolerated as a food but may cause mild digestive upset when consumed in large amounts. High intake of sweet dried longan adds significant sugar and calories to the diet. It may also interact with some medications. Euphoria longana is not right for everyone, so check with a healthcare provider first if you are pregnant or breastfeeding, have a medical condition, or take prescription medication.

Does Euphoria longana interact with any medications?

Possible interactions include: May theoretically add to sedative effects of benzodiazepines and other CNS depressants. Concurrent use with hypoglycemic medications could affect blood sugar response. If you take prescription medication, check with a pharmacist or doctor before using it.

How strong is the scientific evidence for Euphoria longana?

NutraSmarts rates the evidence for Euphoria longana as Limited (2 out of 5). It is backed by 2 clinical trials and 1 cited reference summarized on this page. A higher rating reflects more, larger, and better-designed human studies.

References(1 citations)

Evidence ratings on NutraSmarts are based on the totality of human clinical research, with emphasis on randomized controlled trials, meta-analyses, and systematic reviews. The references below directly support claims made throughout this page.

  1. Hsieh MT, Peng WH, Wu CR, Wang WH, Lin LW. Neuroprotective effects of longan (Dimocarpus longan Lour.) flower water extract on MPP+-induced neurotoxicity in rat brain. Journal of Agricultural and Food Chemistry. 2012;J Agric Food Chem. 2012 Sep 12;60(36):9188-94..PubMedUsed to support: Preclinical evidence that longan flower water extract attenuated MPP+-induced dopaminergic neurotoxicity in rats.