Benefits
Small Increase in Total Testosterone (Class-Level)
The one trial of Testofen itself (120 healthy men aged 43 to 70, 600 mg a day for 12 weeks) reported higher total and free testosterone than placebo. The broader evidence is weaker: a 2023 meta-analysis of 7 fenugreek trials in 449 people found only a small increase in total testosterone (effect size 0.32) and no significant change in free testosterone — one proposed explanation is that furostanol saponins free up a little of the testosterone bound to SHBG, but that remains theory rather than a demonstrated effect in people.
Age-Related Symptoms: Not Supported by the Cited Studies
Testofen has been tested for exactly this: in 120 healthy men aged 43 to 70, 600 mg a day for 12 weeks lowered Aging Male Symptom scores compared with placebo. It is a single 12 week trial in healthy men, not a treatment for diagnosed low testosterone, which needs a doctor's assessment. A separate industry-funded trial of Furosap, a different branded fenugreek extract, also reported improved mood and reproductive measures in male volunteers.
Sexual Desire and Function
The only sexual-function trial cited here used Libifem, a different branded fenugreek extract, and it was done in healthy menstruating women, not men. A separate industry-funded trial of Furosap, another different brand, reported better reproductive measures and mood in male volunteers. None of the studies cited here tested Testofen itself for libido in men.
Resistance Training Strength and Body Composition
The trial behind this claim used a generic fenugreek glycoside extract, not Testofen, and its own authors called it a pilot study. When 7 fenugreek trials in 449 people were pooled in 2023, lean body mass, fat mass and leg press strength were all non-significant, meaning those differences could have been chance.
Endurance: No Cited Evidence
No study cited on this page, including the Testofen trial, reported an aerobic endurance result. Treat endurance as an unsupported claim.
Mechanism of action
Furostanol Saponin SHBG Displacement
Fenuside furostanol saponins are proposed to displace a small fraction of the testosterone bound to SHBG (sex hormone-binding globulin) — in theory making more free testosterone available. In the pooled human data, free testosterone did not change significantly, so this mechanism has not been confirmed in people.
5-alpha-Reductase Modulation
Fenugreek is thought to affect how testosterone converts to DHT. This is a laboratory-level idea, and none of the cited human studies tested whether it explains any sexual function effect.
Aromatase Modulation
Fenugreek may have modest effects on aromatase, the enzyme that turns testosterone into estrogen. This is proposed rather than demonstrated in the human studies cited here.
Direct Anabolic Effects
Animal studies suggest effects on muscle protein synthesis pathways. Animal results do not automatically apply to people, and the pooled human trials found no significant change in lean body mass, fat mass or leg press strength.
Clinical trials
A 2023 systematic review and meta-analysis pooling 7 randomized fenugreek studies. It is not a Testofen study, and the individual trials were mostly small and often industry funded.
449 participants across 7 trials of various fenugreek products.
Total testosterone rose slightly (effect size 0.32). Free testosterone, lean body mass, fat mass and leg press strength were all non-significant. The authors said no conclusions can be drawn for female athletes.
A randomized controlled pilot study of a generic fenugreek glycoside extract, not Testofen, in men during resistance training. The study was industry linked.
A small group of men doing resistance training. The authors themselves described the study as a pilot.
The pilot reported higher testosterone and better body composition. Because it was a small pilot of a different fenugreek product, and the later pooled analysis found no significant effect on lean body mass, fat mass or leg press strength, these results should be treated as preliminary.