🌿 Dried Longan: A TCM Herb for Nourishing Blood, Calming the Mind, and Supporting Memory

Dried longan, also known as Long Yan, is the dried flesh of the longan fruit. In TCM, it is used as both a nourishing food and an herbal ingredient to support Blood, the Heart and Spleen, restful sleep, and recovery from fatigue.

Dried longan is traditionally used in TCM to nourish Blood and support the Heart.

Quick information

• Scientific name / Pinyin / Chinese: Dimocarpus longan / Long Yan / 龙眼
• Flavors, Nature – Meridian: Sweet flavor, Warm nature – enters the Heart and Spleen Meridians
• Main benefits: Traditionally used to nourish Blood, calm the mind, support sleep, reduce tiredness, and maintain concentration
• Reference dosage: 8–16 g per day in dried form

1. Origin and description

Dried longan is made from ripe longan fruit after the peel and seed are removed. The soft fruit flesh is then sun-dried or dehydrated until it becomes golden brown, slightly sticky, and naturally fragrant. The longan tree belongs to the Sapindaceae family and is widely cultivated in Vietnam, southern China, Thailand, and other tropical areas of Southeast Asia.

Fresh longan has translucent, sweet-smelling flesh. After drying, its flavor becomes richer and its texture soft and chewy. It can be prepared as tea, soup, dessert, or an herbal decoction. TCM classifies it as a gentle tonic food for signs of Blood deficiency, mental fatigue, poor sleep, or weakness after illness.

2. Related names of Dried Longan

Other names: Long nhãn, nhãn nhục, long nhục, quế viên nhục, Longan aril

Scientific name: Dimocarpus longan

Pinyin: Long Yan

Chinese name: 龙眼

The Chinese name is often interpreted as “dragon eye,” describing the peeled fruit with its dark central seed. In herbal markets, the dried flesh may also be sold as longan aril or longan meat. Product quality varies with the fruit variety, drying method, moisture, and storage.

3. Flavors, Nature – Meridian

According to TCM theory, this herb has a Sweet flavor and a Warm nature. The Sweet flavor is associated with nourishment and harmonizing effects, while the Warm nature is traditionally considered suitable for people who feel cold, weak, tired, or depleted.

It mainly enters two Meridians:

• Heart Meridian: Traditionally used to nourish Heart Blood, calm the mind, ease occasional restlessness, and support more settled sleep.
• Spleen Meridian: Traditionally used to support the Spleen, promote the production of Qi and Blood, and improve recovery when weakness is linked to poor nourishment.

Because it is sweet and warming, it may not suit every constitution. People with Heat signs, digestive stagnation, or high blood sugar should seek advice before regular use.

4. Benefits of Dried Longan in TCM

In TCM, dried longan is best known as a mild nourishing herb for the Heart and Spleen. Its traditional benefits include:

• Nourishing Blood: Often considered for people with pale complexion, dizziness, weakness, or tiredness associated with Blood deficiency.
• Calming the mind: Commonly included in formulas for occasional nervousness, palpitations, overthinking, or difficulty relaxing at night.
• Supporting restful sleep: Frequently paired with lotus seeds, red dates, or other gentle herbs in evening teas and nourishing soups.
• Supporting memory and focus: Traditionally used for students, office workers, and people experiencing mental fatigue from prolonged concentration.
• Helping recovery after illness: May be included in food-based preparations for people who feel weak or have reduced energy during recovery.

These traditional uses do not replace medical diagnosis or treatment. Persistent insomnia, anemia, palpitations, severe fatigue, or memory changes require professional evaluation.

5. How to use and dosage

The reference amount for dried longan is usually 8–16 g per day. A Herb doctor may adjust the amount according to age, constitution, symptoms, and the other herbs used in a formula.

• Herbal decoction: Simmer 8–16 g with water, alone or with other Blood-nourishing herbs.
• Herbal tea: Steep a small amount with red dates, goji berries, or lotus seeds for a naturally sweet drink.
• Sweet soup: Cook with lotus seeds, snow fungus, or red dates as a traditional nourishing dessert.
• Direct consumption: Eat a small portion as a snack, while monitoring total sugar intake.

Avoid excessive use because the herb is sweet and warming. Store it in an airtight container away from heat and sunlight. Discard it if mold, sour odor, or excess moisture appears.

Soft dried longan herb available from Thanh Tam Herbs.

6. Indications and contraindications

Traditional indications

• Occasional difficulty sleeping or light, unsettled sleep
• Fatigue, weakness, or pale complexion associated with Blood deficiency
• Occasional palpitations, restlessness, or forgetfulness
• Mental tiredness caused by intensive study or desk work
• Weakness during recovery after illness

Contraindications and precautions

• Use cautiously in people with internal Heat, constipation, mouth ulcers, or a tendency to feel overheated.
• People with diabetes, insulin resistance, or medically restricted sugar intake should limit use and consult a healthcare professional.
• Avoid prolonged high-dose use without guidance from a Herb doctor.
• Pregnant or breastfeeding individuals and people taking prescription medicines should obtain professional advice before using concentrated herbal combinations.

7. Reference herbal combinations with Long nhãn

These traditional examples are for reference. Formula choice and dosage should be confirmed by a Herb doctor.

• For nourishing Blood and calming the mind: Longan with lotus seeds and red dates.
• For supporting the Heart and mental clarity: Longan with Goji berries and dong quai.
• For fatigue and weakness: Dried longan with Astragalus and licorice root.
• For a nourishing dessert: Dried longan simmered with lotus seeds and red dates.

8. Frequently asked questions

Can dried longan be used every day?

Healthy adults may use moderate food-level amounts, but daily use is not suitable for everyone. Consider constitution, sugar intake, digestion, and medical conditions.

Does it cause internal Heat?

It may contribute to Heat signs when consumed excessively because it has a Warm nature and Sweet flavor. Reduce or stop use if you notice constipation, mouth dryness, sore throat, or a feeling of excessive warmth.

Is it suitable for people with insomnia?

TCM uses it to nourish Heart Blood and calm the mind when poor sleep accompanies fatigue, palpitations, or overthinking. Chronic insomnia still requires proper assessment.

How can I choose good-quality dried longan?

Choose pieces with a natural golden-brown color, a clean sweet aroma, and a soft but not overly wet texture. Avoid products with artificial fragrance, visible mold, heavy moisture, or an unusually dark and sticky appearance.