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.
Outcome
Evidence
Effect
Studies
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.
Raise testosterone / libidoStandardized extracts (e.g. Testofen) raise testosterone by a small margin in middle-aged men; trials small, short and often industry-funded.
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.
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
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 12 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 16 Sept 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 2026-09-16}
}
For medical claims, citing the underlying primary studies linked above is preferred. NutriDex is an educational reference, not medical advice.