Fenugreek (Testofen / Trigonella foenum-graecum)
Fenugreek seed extract, most studied as the branded Testofen (standardised to Fenuside/saponin glycosides), is a popular libido and 'testosterone-support' supplement. Human trials fairly consistently report improved sexual function and body-composition measures, but effects on actual testosterone are mixed — some studies show a small rise, others none, and free testosterone may reflect DHT-pathway changes rather than true androgen elevation.
01 Overview
Fenugreek furostanol saponins are proposed to inhibit aromatase and 5-alpha-reductase and to support free testosterone, which is the rationale for its use as a mild hormonal aid. The most reproducible clinical outcomes are improved self-reported libido, sexual function and, in some resistance-training studies, modest body-composition benefit, rather than large hormonal shifts.
Lifters use standardised seed extracts daily for libido and as a gentle testosterone-support adjunct. It is well tolerated; the classic side effect is a maple-syrup body odour, along with occasional GI upset. Because it can lower blood glucose, diabetics on medication should monitor closely.
02 Mechanism
Furostanol saponin-rich seed extract proposed to inhibit aromatase and 5-alpha-reductase and support free testosterone, with additional glucose-lowering and libido-enhancing effects.
03 Dosing
| Tier | Dose | Route | Notes |
|---|---|---|---|
| Testofen standardised extract | 300–600 mg/day | Oral | Common trial dose of the branded saponin-standardised extract. |
| General seed extract | 500–1200 mg/day | Oral | Non-standardised seed-extract range varies widely in potency. |
04 Effects
| Effect | Magnitude | Evidence | |
|---|---|---|---|
| Improved libido and sexual functionThe most consistent benefit across placebo-controlled trials of Testofen. | moderate / subjective | Clinical | |
| Possible small free-testosterone changeSome trials report modestly higher free testosterone; others show no significant change. | small / inconsistent | Clinical | |
| Blood-glucose loweringFenugreek reliably lowers blood glucose, a benefit in some and a caution in medicated diabetics. | modest | Clinical |
05 Side effects
| Effect | Severity | Frequency | Evidence | Countermeasures |
|---|---|---|---|---|
| Maple-syrup body odourA sweet, maple-like odour in sweat and urine from sotolon, a fenugreek aroma compound. | Mild | Common | Observational | |
| Hypoglycaemia riskAdditive glucose-lowering with diabetes drugs can cause hypoglycaemia. | Moderate | Medication-dependent | Clinical | |
| Gastrointestinal upsetBloating, gas and diarrhoea from the high soluble-fibre content. | Mild | Common | Observational |