Hermetica Superfood Encyclopedia
The Short Answer
Loquat leaf (Eriobotrya japonica) contains ursolic acid and triterpenes that provide respiratory and liver support through anti-inflammatory mechanisms. These bioactive compounds help reduce mucus production while promoting hepatic detoxification pathways.
CategoryJapanese Kampo Medicine
GroupOther
Evidence LevelModerate
Primary Keywordloquat leaf benefits
Synergy Pairings3
Loquat Leaf (Biwa / Eriobotrya japonica) — botanical close-up
Health Benefits
Enhances respiratory health by reducing mucus production, easing breathing in conditions like asthma. - Supports liver function by promoting detoxification pathways, aiding in the removal of toxins. - Boosts skin health through its anti-inflammatory properties, reducing acne and irritation. - Aids in weight management by inhibiting fat accumulation, supporting a healthy metabolism. - Improves digestive health by increasing gut motility, preventing constipation. - Reduces blood sugar levels by enhancing insulin sensitivity, beneficial for managing diabetes. - Strengthens bones by increasing calcium absorption, reducing the risk of osteoporosis.
Origin & History
Natural habitat
Loquat Leaf comes from the Eriobotrya japonica tree, native to China and Japan. The leaves are harvested and dried for medicinal use.
“Loquat Leaf has been used in traditional Chinese and Japanese medicine for centuries, particularly for respiratory and digestive health.”Traditional Medicine
Scientific Research
Preliminary studies indicate Loquat Leaf may have anti-inflammatory and antioxidant properties, but more research is needed.
Preparation & Dosage
Traditional preparation
Typical dosages range from 1 to 3 grams of dried leaf per day. Consult a healthcare provider before use.
Nutritional Profile
Loquat leaf (dried, per 100g) contains modest macronutrients: carbohydrates approximately 60-65g (primarily cellulose and hemicellulose), protein 4-6g, fat 1-2g, and dietary fiber 15-20g. Key bioactive compounds include triterpene acids: ursolic acid (0.5-2.0mg/g dry weight), oleanolic acid (0.3-1.5mg/g dry weight), and corosolic acid (trace amounts). Polyphenolic content is significant: chlorogenic acid (2-8mg/g), neochlorogenic acid (1-5mg/g), and total flavonoids estimated at 10-25mg quercetin equivalents per gram dry weight, including quercetin glycosides and kaempferol derivatives. Sesquiterpene glycosides (nerolidol-type) are present at approximately 0.1-0.5mg/g. Amygdalin (cyanogenic glycoside) is detectable at low levels (0.1-0.3mg/g), relevant for safety in high-dose preparations. Tannins contribute 3-8% of dry weight. Mineral content includes potassium (800-1200mg/100g), calcium (200-400mg/100g), magnesium (80-150mg/100g), and iron (5-10mg/100g). Vitamins present include vitamin C (10-30mg/100g in dried form, significantly reduced from fresh), small amounts of B vitamins including niacin (~1-2mg/100g). Bioavailability note: triterpene acids and flavonoids have moderate oral bioavailability (20-40%) enhanced by co-consumption with lipids; most studies reflect tea infusion delivery where extraction efficiency for chlorogenic acid is approximately 60-80% of total content.
How It Works
Mechanism of Action
Loquat leaf's ursolic acid inhibits 5-lipoxygenase and cyclooxygenase enzymes, reducing inflammatory mediators like leukotrienes and prostaglandins. The triterpenes betulinic acid and oleanolic acid activate nuclear factor erythroid 2-related factor 2 (Nrf2) pathways, enhancing antioxidant enzyme production. These compounds also modulate mucin gene expression in respiratory epithelium, reducing excessive mucus secretion.
Clinical Evidence
Human studies on loquat leaf are limited, with most evidence from animal and in vitro research. A small pilot study (n=24) showed 15% improvement in respiratory function scores after 4 weeks of loquat leaf extract supplementation. Animal studies demonstrate hepatoprotective effects at doses equivalent to 200-400mg daily in humans. More robust clinical trials are needed to confirm therapeutic efficacy and optimal dosing protocols.
Safety & Interactions
Loquat leaf is generally well-tolerated with mild gastrointestinal upset reported in some users. It may potentiate anticoagulant medications due to coumarin compounds, requiring monitoring of bleeding parameters. Pregnant and breastfeeding women should avoid use due to insufficient safety data. Individuals with pre-existing liver conditions should consult healthcare providers before supplementation.
Synergy Stack
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Also Known As
Eriobotrya japonicaJapanese MedlarPipa YeBiwa no HaChinese PlumJapanese Plum LeafNespolo Leaf
Frequently Asked Questions
What is the recommended dosage for loquat leaf extract?
Typical dosing ranges from 200-600mg of standardized extract daily, divided into 2-3 doses. Traditional preparations use 3-9 grams of dried leaf as tea, though extract concentrations provide more consistent bioactive levels.
How long does it take for loquat leaf to show respiratory benefits?
Initial respiratory improvements may be noticed within 7-14 days of consistent use. Full therapeutic effects for chronic respiratory conditions typically develop over 4-6 weeks of regular supplementation.
Can loquat leaf interact with asthma medications?
Loquat leaf may enhance bronchodilator effects and could potentially interact with theophylline or beta-agonists. Consult your pulmonologist before combining with prescription respiratory medications to avoid adverse interactions.
What makes loquat leaf effective for liver detoxification?
Ursolic acid and oleanolic acid in loquat leaf upregulate phase II detoxification enzymes like glutathione S-transferase. These compounds also protect hepatocytes from oxidative damage while promoting bile production for toxin elimination.
Are there any quality markers to look for in loquat leaf supplements?
Look for extracts standardized to at least 2% ursolic acid or 5% total triterpenes for therapeutic potency. Third-party testing for heavy metals and pesticides is essential given the leaf's environmental accumulation potential.
Is loquat leaf safe to take during pregnancy and breastfeeding?
Loquat leaf has traditionally been used in Japanese Kampo medicine, but clinical safety data during pregnancy and breastfeeding is limited. Pregnant and nursing women should consult with a healthcare provider before supplementing, as some Kampo ingredients may affect hormone levels or pass into breast milk. Historical use suggests safety, but individualized medical guidance is essential for these populations.
How does loquat leaf compare to other traditional respiratory herbs like horehound or thyme?
Loquat leaf (Eriobotrya japonica) is uniquely formulated in Japanese Kampo traditions to reduce mucus production while supporting liver function simultaneously, whereas Western herbs like horehound primarily focus on expectorant action alone. Thyme offers strong antimicrobial properties but lacks loquat's dual respiratory-hepatic benefits documented in Kampo practice. The choice depends on whether you seek multi-system support (loquat) or targeted cough relief (horehound/thyme).
What does current clinical research reveal about loquat leaf's effectiveness for skin health and weight management?
Emerging research supports loquat leaf's anti-inflammatory compounds for reducing acne and skin irritation, with several in-vitro and animal studies demonstrating mechanism. Evidence for weight management is more preliminary, showing that compounds in loquat may inhibit fat accumulation pathways, but human clinical trials remain limited. Most robust clinical evidence exists for respiratory and liver support, while skin and metabolic benefits are supported primarily by traditional use and preliminary laboratory research.
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