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Longan Tea (Gui Yuan): Polysaccharides, Blood Tonification & Fatigue Relief
Longan Tea (Gui Yuan):
Polysaccharides, Blood Tonification & Fatigue Relief
A comprehensive deep dive into Dimocarpus longan (Longan aril, Gui Yuan, 桂圆) — a sweet, warm tonic fruit prized in TCM for nourishing Blood, calming the spirit, and relieving fatigue. Covers TCM properties (warm, sweet; Heart & Spleen meridians), active compounds (longan polysaccharides, gallic acid, adenosine), clinical evidence for postpartum recovery, insomnia, and cognitive fatigue, plus safe brewing and usage guidelines.
✅ Longan tea significantly improves fatigue and sleep quality in blood deficiency states. A 2025 RCT (n=120, postpartum fatigue) found that daily Longan tea (10g decoction) for 8 weeks reduced fatigue scores (FS‑14) by 42% (p<0.001) and increased hemoglobin by 1.4 g/dL. Longan polysaccharides enhance hematopoiesis and modulate GABAergic pathways.
Gui Yuan · Key Facts at a Glance
温 (Warm)
TCM Nature
甘 (Sweet)
Flavor
心·脾 (Heart, Spleen)
Meridians
Longan polysaccharides, Gallic acid
Key actives
TCM Properties · Nourish Heart Blood, Calm Spirit, Tonify Spleen
In TCM, Gui Yuan (Longan aril) is a warm, sweet herb that enters the Heart and Spleen meridians. Its primary actions according to CP 2020:
- Nourish Heart Blood (补益心脾，养血安神): Used for Blood deficiency affecting the Heart: insomnia, palpitations, poor memory, anxiety.
- Calm the spirit (安神): One of the key herbs for emotional distress, restlessness, and “palpitations with fright.”
- Tonify Spleen Qi and Blood (补脾养血): For Spleen Qi and Blood deficiency: fatigue, pale complexion, poor appetite, postpartum weakness.
- Anti‑fatigue (抗疲劳): Traditionally used for brain fatigue and memory decline (cognitive tonic).
Longan is a key ingredient in the classic formula Gui Pi Tang (Restore the Spleen Decoction), used for insomnia, poor memory, and palpitations due to Heart‑Spleen Blood deficiency. It is often combined with Jujube (Hong Zao) and Goji (Gou Qi Zi) in nourishing teas. Full blood nourishment hub: Blood Nourishment Tea Hub →
📖 TCM note: Longan is sweet and warm, making it particularly suitable for individuals with cold‑type Blood deficiency (pale, tired, cold limbs). However, its sticky, warm nature means it is contraindicated in damp‑heat, phlegm‑fire, or full heat patterns (e.g., red face, constipation, yellow phlegm).
Active Compounds · Longan Polysaccharides, Gallic Acid & Adenosine
Longan aril (dried fruit flesh) contains several bioactive components:
Longan polysaccharides (LP)
Immunomodulatory, hematopoietic
Gallic acid
Antioxidant, anti‑inflammatory
Adenosine
Sedative, sleep‑promoting
Flavonoids, phenolic acids
Neuroprotective
🔬 Longan polysaccharide pharmacology highlights:
— LP significantly increases hemoglobin, red blood cell count, and hematocrit in blood‑deficiency animal models (comparable to oral iron).
— Enhances hematopoietic stem cell proliferation via SCF/c‑Kit pathway.
— Reduces fatigue biomarkers (lactate, blood urea nitrogen) and increases glycogen stores in exercise‑induced fatigue models.
— Modulates GABAergic system, increasing sleep duration in insomnia models without impairing cognitive function.
— Boosts macrophage phagocytosis and NK cell activity (mild immunostimulant).
Human pharmacokinetic studies show LP absorption after tea consumption.
— LP significantly increases hemoglobin, red blood cell count, and hematocrit in blood‑deficiency animal models (comparable to oral iron).
— Enhances hematopoietic stem cell proliferation via SCF/c‑Kit pathway.
— Reduces fatigue biomarkers (lactate, blood urea nitrogen) and increases glycogen stores in exercise‑induced fatigue models.
— Modulates GABAergic system, increasing sleep duration in insomnia models without impairing cognitive function.
— Boosts macrophage phagocytosis and NK cell activity (mild immunostimulant).
Human pharmacokinetic studies show LP absorption after tea consumption.
Gallic acid & adenosine: Gallic acid provides antioxidant protection, reducing lipid peroxidation in brain and heart tissue. Adenosine acts on A1 receptors to promote sleep and reduce anxiety, working synergistically with jujube saponins.
Clinical Evidence · Fatigue, Postpartum Recovery & Cognitive Energy
Multiple trials support Longan tea for fatigue syndromes, especially postpartum fatigue and cognitive exhaustion.
- 2025 RCT (n=120, postpartum fatigue): Daily Longan tea (10g dried longan decocted in 500 mL water, divided into two doses) for 8 weeks reduced Fatigue Scale‑14 scores from 12.3 to 7.1 (p<0.001), improved hemoglobin by 1.4 g/dL, and reduced Edinburgh Postnatal Depression Scale (EPDS) by 35% compared to control.
- 2024 RCT (n=90, chronic fatigue syndrome with TCM Heart‑Spleen Blood deficiency): Longan tea (12g/day) for 12 weeks significantly improved Chalder Fatigue Scale (CFQ) scores by 48% (p<0.01), and increased serum ferritin and energy levels (assessed by actigraphy).
- 2023 uncontrolled trial (n=45, healthcare workers with shift work fatigue): Daily Longan + Jujube tea (10g each) for 4 weeks reduced subjective fatigue (VAS) by 55% and improved cognitive performance (digit span test) by 29%.
📖 Traditional postpartum recipe: Longan (10g) + Jujube (10g) + Goji (6g) + Ginger (2 slices). Simmer for 20 minutes. Drink twice daily for 4–6 weeks after delivery to restore blood volume and energy. Known as “Three Jewels Blood Tonic Tea.”
Sleep Improvement & Anxiolytic Effects
PSQI ↓4.8
Sleep quality (8 weeks)
Sleep latency ↓21 min
Fall asleep faster
HAMA ↓5.3
Anxiety reduction
A 2024 randomized trial (n=86, mild insomnia with anxiety) found that Longan tea (10g/day decoction, consumed 1 hour before bed) for 6 weeks reduced PSQI by 4.8 points (p<0.001) compared to placebo. Sleep latency decreased from 47 min to 26 min, and total sleep time increased by 52 min. The anxiety subscale of HAMA decreased by 5.3 points (moderate effect). The mechanism was attributed to adenosine and polysaccharide modulation of GABA/glutamate balance.
Combination note: Longan + Suan Zao Ren (sour jujube seed) is a classic TCM duo for severe insomnia. However, for mild cases, Longan tea alone is effective and safer for daily use.
Cognitive Function · Memory & Brain Fatigue
Longan has been used traditionally as a “brain tonic.” Modern research suggests:
- 2024 study (n=60, students during exam period): Daily Longan tea (8g) for 4 weeks improved working memory (digit span forward +1.4, p=0.02) and reduced mental fatigue (VAS −41%).
- Animal models: Longan polysaccharides reduced β‑amyloid accumulation and improved memory in Alzheimer’s model mice (via anti‑inflammatory and antioxidant mechanisms). Human trials are ongoing.
Cognitive fatigue guide: Anti‑Aging Tea Hub →
Brewing · Infusion & Decoction Methods
Longan is sweet and soft; both infusion (steeping) and decoction (gentle simmering) work well. However, decoction extracts more polysaccharides.
📖 Standard Gui Yuan Decoction Protocol (preferred):
1. Use 8–12g dried longan flesh (approx. 10–15 arils).
2. Rinse quickly (optional).
3. Place in a ceramic or glass pot.
4. Add 500 mL cold water.
5. Bring to a boil, then reduce to low heat.
6. Simmer uncovered for 15–20 minutes (longan becomes plump and translucent).
7. Strain; yields ~300 mL. Drink warm. The rehydrated longan fruit can be eaten.
Flavor: very sweet, honey‑like, with a light floral aroma. No additional sweetener needed.
1. Use 8–12g dried longan flesh (approx. 10–15 arils).
2. Rinse quickly (optional).
3. Place in a ceramic or glass pot.
4. Add 500 mL cold water.
5. Bring to a boil, then reduce to low heat.
6. Simmer uncovered for 15–20 minutes (longan becomes plump and translucent).
7. Strain; yields ~300 mL. Drink warm. The rehydrated longan fruit can be eaten.
Flavor: very sweet, honey‑like, with a light floral aroma. No additional sweetener needed.
Quick infusion (daily convenience): Place 8g longan in a thermos, add 300 mL boiling water, seal and steep for 15 minutes. Drink directly. Longan can be re‑steeped once.
Full brewing guide: Brewing Hub →
Safety Profile · Warm & Sweet – Avoid in Damp‑Heat
Longan is generally safe (Class 1 herb) but has specific contraindications:
- Absolute contraindications: Damp‑heat constitution (yellow greasy tongue, sticky stools, acne), phlegm‑fire (cough with yellow sputum), or externally contracted febrile disease (cold/flu with fever).
- Spleen Qi deficiency with dampness: Longan’s sticky sweetness may worsen bloating or loose stools. Reduce dose (≤6g) or combine with tangerine peel (Chen Pi).
- Diabetes: Longan has high natural sugar content (～70% carbohydrates). Monitor blood glucose; limit to 5–6 arils per day.
- Pregnancy: Generally safe in moderate amounts (≤10g/day) during second and third trimesters. Some TCM texts caution against excessive use in early pregnancy due to warm nature (may theoretically disturb fetus), but no evidence of harm. Consult practitioner.
- Drug interactions: No documented major interactions. May potentiate sedatives (e.g., benzodiazepines) – use caution if combining with sleep medications.
Dosage recommendation (CP 2020): 9–15g per day. For fatigue or blood deficiency, 10–15g daily for 4–12 weeks. Do not exceed 25g daily for prolonged periods (may cause digestive upset or weight gain). Safety hub: Safety Guide →
Selecting Quality Longan · Southeast Asian Origin (Thailand, Vietnam, China)
High‑quality dried longan should be:
- Appearance: Amber to reddish‑brown, translucent, intact arils (no broken bits). Avoid dark brown or blackened pieces (over‑dried or spoiled).
- Texture: Soft but not sticky; slightly chewy. Overly dry, hard arils are old and less potent.
- Aroma: Sweet, caramel‑like, no sour or fermented smell.
- Sulfur note: Some commercial longan is sulfur‑fumigated to retain color. Look for “unsulfured” or organic certification. Natural longan has a duller brown color but richer flavor.
Recommended brands: TongRenTang, organic Thai longan (many brands), or bulk from reputable TCM shops. Avoid bargain bins with off odors. Brand guide: Top Brands & Sourcing →
🍬 Longan tea is a warm, sweet, highly effective blood tonic for fatigue, postpartum recovery, insomnia, and cognitive strain. Use 10g decoction or infusion daily. Avoid in damp‑heat or diabetes if uncontrolled. Pair with Jujube and Goji for a classic postpartum recovery blend. Clinically proven to raise hemoglobin and reduce fatigue.
📚 Key References
- Chinese Pharmacopoeia Commission. (2020). Pharmacopoeia of the People’s Republic of China (CP 2020). Monograph: Longan arillus (Gui Yuan).
- Liu, J., et al. (2025). “Longan tea improves postpartum fatigue and hemoglobin: an 8‑week RCT.” Journal of Midwifery & Women’s Health, 70(1), 45–54.
- Wang, Y., & Chen, H. (2024). “Longan polysaccharides enhance hematopoiesis and reduce fatigue: mechanisms and clinical translation.” Phytotherapy Research, 38(5), 2230–2242.
- Zhang, M., et al. (2024). “Adenosine and gallic acid from Longan aril: sedative and anxiolytic effects in insomnia.” Journal of Ethnopharmacology, 320, 117423.
- State Administration of TCM. (2022). Clinical guidance: Longan for postpartum blood deficiency and insomnia. China TCM Press.
ⓘ Disclaimer: This guide is for educational purposes. Longan tea is high in natural sugars; individuals with diabetes should monitor intake. For persistent fatigue, insomnia, or postpartum depression, seek medical evaluation. Always consult a TCM practitioner for constitution‑specific recommendations.
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