NutriDex

The Supplement Research Compendium
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Fenugreek

Trigonella foenum-graecum

Culinary seed that modestly lowers blood sugar and lipids; small testosterone signal.

Moderate evidence ⚡Performance🫀Heart & Metabolic

✚ Updated · How we grade evidence

Evidence tier
Moderate
Research weight
Citations
8 verified / 8
Classification
Performance
❝
What the evidence says. Graded moderate: multiple meta-analyses show real but modest glucose and lipid improvements, yet trials are small, heterogeneous and often low-quality; the testosterone/performance signal is small (SMD ~0.3) and largely from short, industry-funded extract trials. (Moderate evidence: Several controlled trials; effects real but modest or context-dependent.)

What is Fenugreek?

Fenugreek (Trigonella foenum-graecum) is a performance supplement used for lower fasting blood sugar. NutriDex grades the human evidence as Moderate. Fenugreek is a legume seed used as a spice and traditional remedy. Its soluble fiber and 4-hydroxyisoleucine plausibly slow glucose absorption and aid insulin secretion. Meta-analyses of randomized trials find it lowers fasting blood glucose (roughly 20 mg/dL) and HbA1c (~0.5%) in type 2 diabetes, and modestly improves total cholesterol, triglycerides and HDL. Separately, standardized seed extracts (notably Testofen, 600 mg/day) raise total and free testosterone by a small margin and may improve libido and androgen-deficiency symptoms in middle-aged and older men; a sports meta-analysis found small anabolic and performance effects (testosterone SMD 0.32) in male athletes only. Effect sizes are modest, many trials are small, short, industry-funded or of low methodological quality, and results vary with preparation and dose. Fenugreek is a reasonable adjunct, not a replacement, for diabetes or lipid therapy.

Purported Benefits

✓Lower fasting blood sugar
✓Improve HbA1c in type 2 diabetes
✓Reduce cholesterol & triglycerides
✓Small testosterone & libido support
✓Modest strength/anabolic effect

Evidence by outcome

The same supplement can be well-proven for one use and unproven for another — here is the human evidence graded outcome by outcome.

OutcomeEvidenceEffectStudies
Lower fasting blood glucoseMeta-analyses of RCTs in type 2 diabetes show ~20 mg/dL fasting glucose drop, but trials are mostly small and variable. Moderate ↑ benefit · moderate 2
Improve HbA1c in type 2 diabetesMeta-analysis found significant HbA1c reduction (~0.5%); modest and adjunctive, not a replacement for therapy. Moderate ↑ benefit · small 1
Improve cholesterol & triglyceridesMultiple meta-analyses show reduced TC/LDL/TG and raised HDL, with larger benefit in diabetics. Moderate ↑ benefit · small 3
Raise testosterone / libidoStandardized extracts (e.g. Testofen) raise testosterone by a small margin in middle-aged men; trials small, short and often industry-funded. Preliminary ↑ benefit · small 3
Strength / anabolic & athletic performanceSports meta-analysis found small anabolic/performance effect (testosterone SMD 0.32) in male athletes only. Preliminary ↑ benefit · small 2

Dosing & Compounds

Typical Dose
Seed powder ~5–10 g/day, or standardized seed extract 300–600 mg/day (e.g. Testofen) for testosterone studies; soluble fiber content drives the glycemic effect.
Active Compounds
4-hydroxyisoleucineGalactomannan (soluble fiber)Steroidal saponins (e.g. protodioscin)Trigonelline

Safety & Cautions

Generally well tolerated; common effects are GI upset, bloating, diarrhea and a harmless maple-syrup body/urine odor. As a Fabaceae legume it can cross-react in people allergic to peanuts, chickpeas or soy and has caused anaphylaxis. Because it lowers glucose and has antiplatelet activity, it can add to antidiabetic drugs (hypoglycemia risk) and anticoagulants/antiplatelets like warfarin (bleeding/INR changes); it may also reduce absorption of some oral drugs. Avoid high/medicinal doses in pregnancy (uterine-stimulant, possible fetal effects), and use cautiously before surgery. Educational only — always check with your doctor or pharmacist before combining Fenugreek with any medicine.

Fenugreek drug interactions

Known or theoretical interactions between Fenugreek and common medications — educational, not exhaustive. Always check with your doctor or pharmacist before combining Fenugreek with any medicine.

Caution
Diabetes drugs (insulin, metformin)
Fenugreek may lower blood sugar; large doses alongside diabetes drugs can cause a harmful drop in blood sugar.
Soluble fiber and galactomannan slow carbohydrate absorption and may improve insulin sensitivity, adding to antidiabetic drug effects. NCCIH — Fenugreek
Caution
Hormone therapy / tamoxifen
Fenugreek has phytoestrogen activity; use caution with hormone therapy or hormone-sensitive conditions.
Fenugreek contains estrogen-like isoflavone and saponin constituents that may exert weak hormonal effects. NCCIH — Fenugreek

Key Studies

Meta-analysis Kim 2023 ✓ PubMed
Meta-analysis of 10 RCTs (n=706): fenugreek significantly lowered fasting glucose, 2-h glucose and HbA1c, and improved TC, TG and HDL; no severe adverse events.
Meta-analysis Wankhede 2023 ✓ PubMed
Systematic review with meta-analysis (7 studies, 449 athletes): small anabolic/performance effect in males — total testosterone SMD 0.32 (95% CI 0.09–0.55); no effect shown in females.
Meta-analysis Heshmat-Ghahdarijani 2020 ✓ PubMed
Meta-analysis of 15 RCTs: fenugreek reduced total cholesterol, LDL and triglycerides and raised HDL, with larger lipid benefit in diabetic subjects.
Meta-analysis Askarpour 2020 ✓ PubMed
Meta-analysis of 12 RCTs (n=560): fenugreek significantly reduced total cholesterol, LDL and triglycerides and raised HDL, without changing body weight or BMI.
Meta-analysis Mansoori 2020 ✓ Full text
Meta-analysis of 4 RCTs: fenugreek seed extract significantly increased total serum testosterone in men vs control.
RCT Rao 2016 ✓ PubMed
RCT, 120 men aged 43–70 on 600 mg/day Testofen for 12 weeks: small but significant rise in total and free testosterone and fewer androgen-deficiency symptoms.
RCT Poole 2010 ✓ PubMed
RCT, 49 resistance-trained men: 500 mg/day fenugreek extract over 8 weeks significantly improved upper/lower-body strength and reduced body fat vs placebo.
RCT Gupta 2001 ✓ PubMed
Small RCT in type 2 diabetes: 1 g/day hydroalcoholic fenugreek extract improved insulin sensitivity (HOMA) and triglycerides over 2 months.
8 sources cited · 8 verified Search all studies on PubMed ↗

Common questions about Fenugreek

What is Fenugreek used for?

Fenugreek is most often taken for Lower fasting blood sugar, Improve HbA1c in type 2 diabetes, Reduce cholesterol & triglycerides, Small testosterone & libido support. Culinary seed that modestly lowers blood sugar and lipids; small testosterone signal.

Does Fenugreek work — what does the evidence say?

Moderate evidence. Several controlled trials; effects real but modest or context-dependent. Fenugreek is a legume seed used as a spice and traditional remedy. Its soluble fiber and 4-hydroxyisoleucine plausibly slow glucose absorption and aid insulin secretion. Meta-analyses of randomized trials find it lowers fasting blood glucose (roughly 20 mg/dL) and HbA1c (~0.5%) in type 2 diabetes, and modestly improves total cholesterol, triglycerides and HDL. Separately, standardized seed extracts (notably Testofen, 600 mg/day) raise total and free testosterone by a small margin and may improve libido and androgen-deficiency symptoms in middle-aged and older men; a sports meta-analysis found small anabolic and performance effects (testosterone SMD 0.32) in male athletes only. Effect sizes are modest, many trials are small, short, industry-funded or of low methodological quality, and results vary with preparation and dose. Fenugreek is a reasonable adjunct, not a replacement, for diabetes or lipid therapy.

What is the typical dose of Fenugreek?

Seed powder ~5–10 g/day, or standardized seed extract 300–600 mg/day (e.g. Testofen) for testosterone studies; soluble fiber content drives the glycemic effect.

Is Fenugreek safe? Any cautions or side effects?

Generally well tolerated; common effects are GI upset, bloating, diarrhea and a harmless maple-syrup body/urine odor. As a Fabaceae legume it can cross-react in people allergic to peanuts, chickpeas or soy and has caused anaphylaxis. Because it lowers glucose and has antiplatelet activity, it can add to antidiabetic drugs (hypoglycemia risk) and anticoagulants/antiplatelets like warfarin (bleeding/INR changes); it may also reduce absorption of some oral drugs. Avoid high/medicinal doses in pregnancy (uterine-stimulant, possible fetal effects), and use cautiously before surgery.

How many studies support Fenugreek?

NutriDex cites 8 sources for Fenugreek, graded "Moderate".

Does Fenugreek interact with any medications?

Yes — known or theoretical interactions include: Diabetes drugs (insulin, metformin) (caution), Hormone therapy / tamoxifen (caution). This is educational and not exhaustive; always check with your doctor or pharmacist before combining Fenugreek with any medicine.

Cite this page
APA

Peh, D. (2026). Fenugreek (Trigonella foenum-graecum): Benefits, Dosage, Side Effects & Evidence. NutriDex — The Supplement Research Compendium. Retrieved 26 Jun 2026, from https://nutridex.info/s/fenugreek

BibTeX
@misc{nutridex_fenugreek,
  author       = {Peh, Daryl},
  title        = {Fenugreek (Trigonella foenum-graecum): Benefits, Dosage, Side Effects \& Evidence},
  year         = {2026},
  howpublished = {NutriDex --- The Supplement Research Compendium},
  url          = {https://nutridex.info/s/fenugreek},
  note         = {Reviewed by Dr Daryl Peh, MBBS Singapore, MMed FM. Accessed 2026-06-26}
}

For medical claims, citing the underlying primary studies linked above is preferred. NutriDex is an educational reference, not medical advice.

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