Hu Lu Ba
StarTrigonella foenum-graecum L.
Traditionally used for
- Cough & breathing
- Digestion
Cautions & contraindications
- Pregnancy
☯ TCM Properties
Tonifies Kidney Yang; Dispels Cold-Dampness; Alleviates Pain
Traditional Chinese Uses
Hu Lu Ba (fenugreek seed) is a warm, bitter herb used in Chinese medicine to warm Kidney Yang and dispel cold from the lower burner. It is indicated for cold-type lower abdominal pain, scrotal coldness and pain from Liver-channel cold, hernia pain from cold invasion, and the frigid sensation and weakness of Kidney Yang deficiency. It is especially relevant when cold and Damp combine to cause dull, persistent pain in the pelvic and lower abdominal region.
Western Herbalism Properties
Relationships
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Botanical Description
Trigonella foenum-graecum, fenugreek, is an annual herbaceous legume in the family Fabaceae, believed native to the eastern Mediterranean and Western Asia and cultivated since antiquity across India, the Middle East, North Africa, and southern Europe. The plant grows 30-60 cm tall with erect, sparingly branched stems and a slender taproot bearing nitrogen-fixing nodules. The alternate, trifoliolate leaves resemble those of clover, with obovate, toothed leaflets 2-3 cm long and stipulate petioles, releasing a characteristic aromatic odor when crushed. Solitary or paired pale yellow to whitish, sessile, papilionaceous flowers 12-18 mm long appear in the leaf axils in early summer. The fruit is a long, slender, beaked, slightly curved pod 8-15 cm long containing 10-20 hard, oblong, yellow-brown seeds with a deep diagonal groove dividing each seed into two unequal lobes. The seeds, harvested when fully dry, are the principal medicinal and culinary part.
Active Constituents
4-Hydroxyisoleucine
Non-protein amino acidThe best-characterised hypoglycaemic constituent. It acts as a glucose-dependent insulin secretagogue, stimulating insulin release only when glucose is elevated, which is the pharmacological reason fenugreek lowers post-prandial and fasting glucose in trials.
Trigonelline
Pyridine alkaloid (N-methylnicotinic acid)A characteristic marker alkaloid of the genus, contributing to the seed's glucose- and lipid-lowering activity in animal work. It is also present in coffee, so it is not unique to fenugreek.
Galactomannan
Soluble polysaccharide gumConcentration: The seed endosperm is largely galactomannan, and the mucilage fraction is the bulk of the seed's soluble fibre
Forms a viscous gel in the gut that slows gastric emptying and carbohydrate absorption. This is a mechanical mechanism independent of the seed's alkaloids and amino acids, and it accounts for much of the reduction in post-prandial glucose. It is also why fenugreek can delay the absorption of drugs taken at the same time.
Diosgenin
Steroidal sapogeninReleased on hydrolysis of the seed's furostanol saponins. It is a starting material for industrial steroid synthesis, which is the origin of the widespread but unproven claim that fenugreek is hormonally active in humans; diosgenin is not converted to steroid hormones in the human body.
Steroidal saponins (protodioscin and trigoneosides)
Furostanol and spirostanol saponinsThe fraction standardised in commercial extracts marketed for libido and androgen-related symptoms. Saponins also account for the seed's bitterness and its mild gastrointestinal irritancy at high doses.
Sotolone (4,5-dimethyl-3-hydroxy-2[5H]-furanone)
Furanone flavour compoundThe single compound responsible for fenugreek's maple-syrup odour, for the aroma of maple syrup itself, and for the smell of the urine in maple syrup urine disease. It is excreted in urine and sweat after ingestion, and this is not a curiosity: it has caused false diagnoses of maple syrup urine disease in infants, in one case after the infant drank fenugreek tea and in another after maternal ingestion during pregnancy.
Coumarin constituents
CoumarinsThe chemical basis for concern about additive effect with coumarin anticoagulants. Their concentration in the seed is low, and simple coumarins are not themselves anticoagulant, so the mechanism of the reported warfarin case remains unsettled.
Fenugreek seed storage proteins
Allergenic legume proteinsFenugreek is a Fabaceae legume, and IgE cross-reactivity with peanut and chickpea has been reported, including occupational asthma and rhinitis from inhaling the seed powder.
⚠ Drug Interactions
Insulin, sulfonylureas, meglitinides and other glucose-lowering drugs
This is a real pharmacodynamic interaction, not a theoretical one. Meta-analyses of randomized controlled trials in type 2 diabetes and prediabetes show significant reductions in fasting blood glucose, two-hour post-load glucose and HbA1c with fenugreek. Two independent mechanisms operate together: 4-hydroxyisoleucine is a glucose-dependent insulin secretagogue, and the galactomannan gum slows carbohydrate absorption. Trials have used therapeutic-scale doses of seed powder and standardised extracts, so the effect is achievable at doses patients actually take.
Clinical note: Do not add fenugreek at therapeutic doses to insulin or a sulfonylurea without glucose monitoring and a plan to reduce the drug dose. Warn the patient about hypoglycaemia symptoms. Culinary quantities are not a concern; capsule and extract doses are.
Warfarin and other coumarin anticoagulants
A published case describes a patient stable on warfarin for atrial fibrillation whose INR rose after starting boldo and fenugreek, normalised within a week of stopping both, and rose again on rechallenge, with a Naranjo assessment of probable. Because two herbs were taken together the attribution to fenugreek alone is not secure. Fenugreek contains coumarin constituents, but controlled human coagulation data are limited and one small study of fenugreek seed powder taken twice daily for three months found no change in platelet aggregation or fibrinolytic activity.
Clinical note: Check INR within a week of starting or stopping fenugreek in a patient on warfarin, and again at two to three weeks. The signal is not strong enough to prohibit the combination but is strong enough to monitor.
Aspirin, clopidogrel and other antiplatelet drugs
Extrapolated from the coumarin content and the warfarin case report. Direct evidence is absent and the available platelet-function data are negative, so this is a caution rather than a finding.
Clinical note: No routine action. Consider stopping high-dose fenugreek extracts a week before elective surgery.
Newborn and infant metabolic screening for maple syrup urine disease
Fenugreek contains sotolone, the same furanone that produces the characteristic urine odour of maple syrup urine disease, and it is excreted unchanged in urine. Two documented routes exist. A five-week-old infant given fenugreek-containing herbal tea was investigated for maple syrup urine disease, and enantioselective multidimensional gas chromatography with mass spectrometry found sotolone in the urine rather than the branched-chain ketoacids of the real disease. A separate report describes pseudo-maple syrup urine disease in a newborn following maternal ingestion of fenugreek during pregnancy. The odour is a genuine diagnostic pitfall, and both reports specifically urge clinicians to take a herbal tea history before escalating.
Clinical note: Ask about fenugreek, fenugreek tea and helba tea in any infant investigated for a maple-syrup urine odour, and in any breastfeeding mother or pregnant woman using it. Confirm or exclude the real disease on branched-chain amino acid and ketoacid analysis rather than on smell.
Peanut and chickpea in legume-allergic patients
Fenugreek is a legume in the Fabaceae, the same family as peanut and chickpea, and IgE cross-reactivity between them has been reported. Sensitisation to the powdered seed by inhalation is also described in food-industry and kitchen settings.
Clinical note: Ask about peanut and chickpea allergy before prescribing. Advise care when handling loose powder.
Use in pregnancy alongside any obstetric medication
Fenugreek has a long-standing reputation as a uterine stimulant and is traditionally avoided in pregnancy, and maternal prenatal ingestion has been shown to produce a maple-syrup odour in the newborn that prompted investigation for an inborn error of metabolism. Its widespread use as a galactagogue after delivery is a separate matter from use during pregnancy.
Clinical note: Avoid therapeutic doses in pregnancy. If a woman has used it late in pregnancy, alert the paediatric team so a maple-syrup odour in the newborn is not misread.
Dosage
| Form | Amount | Frequency | Duration | Population | Notes |
|---|---|---|---|---|---|
| decoction | 5–10 g | Daily | — | — | 中国药典 2020 【用法与用量】5～10g。 【性味与归经】苦，温。归肾经。 — Chinese Pharmacopoeia 2020, quoted verbatim; route and cautions preserved. Replaces a cleared category-filler value. |
Evidence Tier
Strong evidence · 6 studiesRecorded studies by study design, strongest design at the top. This is a study-design tier only, not a GRADE rating: it does not weigh risk of bias, consistency or precision.
Systematic review / meta-analysis
2
2 verified · 0 unverified
Randomized controlled trial
2
2 verified · 0 unverified
Show 2 studies
- Testofen, a specialised Trigonella foenum-graecum seed extract reduces age-related symptoms of androgen decrease, increases testosterone levels and improves sexual function in healthy aging males in a double-blind randomised clinical study
- Physiological Aspects of Male Libido Enhanced by Standardized Trigonella foenum-graecum Extract and Mineral Formulation
Other clinical trial
0
Observational / case report
2
2 verified · 0 unverified
In vitro / animal
0
Other / unclassified
0
Verified: design read from PubMed for a DOI that resolves to the cited paper Unverified: taken from the study's recorded description
Clinical Studies
The Effect of Fenugreek in Type 2 Diabetes and Prediabetes: A Systematic Review and Meta-Analysis of Randomized Controlled Trials
Pooled randomized controlled trials in type 2 diabetes and prediabetes. Fenugreek significantly reduced fasting blood glucose, two-hour post-load glucose and HbA1c, and improved total cholesterol, triglycerides and HDL cholesterol, but did not significantly change HOMA-IR, LDL cholesterol or body mass index. The pattern suggests an effect on glucose handling and secretion rather than on insulin resistance.
Effectiveness of fenugreek as a galactagogue: A network meta‐analysis
A network meta-analysis of galactagogue trials in which fenugreek outperformed placebo, control and reference comparators for milk output. The underlying trials are small and heterogeneous in preparation and dose, so the direction of effect is more secure than its size.
Testofen, a specialised Trigonella foenum-graecum seed extract reduces age-related symptoms of androgen decrease, increases testosterone levels and improves sexual function in healthy aging males in a double-blind randomised clinical study
A double-blind randomised trial of a standardised seed extract in healthy ageing men reporting reduced androgen-deficiency symptom scores, increased testosterone and improved sexual function. It is industry-sponsored work on a proprietary extract, so the findings should not be generalised to whole seed or to other extracts, and independent replication is limited.
Physiological Aspects of Male Libido Enhanced by Standardized Trigonella foenum-graecum Extract and Mineral Formulation
An earlier randomised placebo-controlled trial of the same standardised extract combined with minerals, reporting improved self-rated libido. The combination formulation means the effect cannot be attributed to fenugreek alone.
False Diagnosis of Maple Syrup Urine Disease Owing to Ingestion of Herbal Tea
A five-week-old infant given a fenugreek-containing herbal tea was investigated for maple syrup urine disease on the strength of the urine odour. Enantioselective multidimensional gas chromatography with mass spectrometry identified sotolone in the urine, the same compound that gives the disease its name, rather than any metabolic defect. The authors warn clinicians to take a herbal tea history before pursuing costly investigation.
Pseudo‐maple syrup urine disease due to maternal prenatal ingestion of fenugreek
Demonstrates the second exposure route: a newborn presented with the maple-syrup odour after the mother ingested fenugreek during pregnancy, with no metabolic disease present. Together with the New England Journal report this establishes that both direct infant ingestion and maternal prenatal use can produce the false picture.
⚠ Safety & Contraindications
- Pregnancy
Contraindications
Its use is prohibited in patients with vigorous fire due to yin deficiency.
Source: Xi S, Gong Y. Essentials of Chinese Materia Medica and Medical Formulas. Academic Press/Elsevier, 2017, pp. 344–356.
Historical Texts
Jia You Ben Cao
Northern Song dynasty, 1060 CEBen Cao Gang Mu
Ming dynasty, 1596References
- F. Podebrad, M. Heil, S. Reichert, A. Mosandl, A. C. Sewell, H. Böhles. 4,5‐Dimethyl‐3‐hydroxy‐2[5H]‐furanone (sotolone) — The odour of maple syrup urine disease . Journal of Inherited Metabolic Disease (1999) [DOI]
- Jean-Philippe Lambert, Julie Cormier. Potential Interaction between Warfarin and Boldo‐Fenugreek . Pharmacotherapy: The Journal of Human Pharmacology and Drug Therapy (2001) [DOI]
This information is for educational purposes only and is not intended to replace professional medical advice. Always consult a qualified healthcare provider before using any herbal remedy, especially if you are pregnant, nursing, or taking medications.
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