Does Fenugreek Actually Boost Testosterone?

Testosterone boosters are one of the more questionable categories in the supplement industry. There are dozens of ingredients marketed as natural ways to increase testosterone, improve libido, build muscle, and accelerate fat loss. Some have a little research behind them, while others rely almost entirely on marketing.

Fenugreek is one of the more interesting ingredients in this category because it actually has several randomized controlled trials examining its effects on testosterone. It's also found in many popular men's health supplements, often with claims that it can support healthy testosterone levels without the risks associated with hormone therapy.

But having research behind an ingredient doesn't necessarily mean the research supports the claims being made about it. A statistically significant increase in testosterone isn't automatically a meaningful increase, and changes in total testosterone don't always translate into changes in biologically available testosterone.

A systematic review and meta-analysis published in August 2026 in Frontiers in Nutrition took a closer look at this question. Researchers evaluated 13 randomized, placebo-controlled studies involving fenugreek-derived preparations, with particular attention to total testosterone, free testosterone, and related outcomes such as sexual function, strength, and body composition.

The results were mixed. Fenugreek produced a small statistically significant increase in total testosterone, but there was no reliable improvement in free testosterone. More importantly, the researchers rated the certainty of the evidence as very low and concluded that the findings don't justify commercial testosterone-boosting claims.

That's worth examining because the difference between a promising laboratory result and a supplement that meaningfully improves someone's health or performance is often much larger than marketing makes it seem.

TLDR

A 2026 systematic review and meta-analysis examined 13 randomized, placebo-controlled trials to determine whether fenugreek-derived supplements meaningfully increase testosterone in adult men.

• Total testosterone increased slightly: Six studies involving 385 participants showed a small statistically significant effect (standardized mean difference of 0.25).

• Free testosterone did not reliably increase: Five studies involving 334 participants showed no statistically significant benefit.

• The evidence was rated very low certainty for both testosterone outcomes.

• None of the 13 studies had an overall low risk of bias, and industry funding or involvement was common.

• Some studies reported improvements in sexual-function questionnaires, body-fat percentage, and bench-press strength, but these findings don't establish that testosterone was responsible.

• Most studies used specialized fenugreek extracts at approximately 500–600 mg daily for 8–12 weeks. The findings cannot automatically be applied to every fenugreek product.

• The bottom line: Fenugreek may produce a small increase in total testosterone, but there isn't convincing evidence that it reliably increases free testosterone or produces clinically meaningful testosterone-related benefits.

What Is Fenugreek?

Fenugreek (Trigonella foenum-graecum) is a plant whose seeds have been used for centuries as a food ingredient and in traditional medicine. The seeds contain several biologically active compounds, including steroidal saponins, sapogenins, trigonelline, 4-hydroxyisoleucine, flavonoids, and polyphenols.

Some of these compounds have attracted interest because of their potential effects on metabolism and hormone-related pathways. Steroidal sapogenins, including diosgenin, are often mentioned in discussions about testosterone because of their chemical structures and proposed interactions with steroid metabolism.

However, the presence of a steroid-related plant compound doesn't mean the body converts it into testosterone. Nor does it establish that consuming fenugreek will produce a meaningful increase in circulating testosterone.

Different fenugreek supplements also contain different concentrations of these compounds. A standardized extract designed for clinical research may be quite different from ordinary ground fenugreek seeds or an inexpensive supplement containing an unspecified extract.

That becomes important when interpreting the research because fenugreek isn't one single, chemically identical ingredient across every study or product.

How Was the Study Conducted?

The researchers searched several major scientific databases and clinical trial registries for randomized, placebo-controlled trials involving oral fenugreek preparations in adult men. Their search included studies available through May 11, 2026.

They identified 13 eligible studies, eight of which provided primary testosterone-related evidence. The remaining five examined related outcomes or used designs and formulations that made them less suitable for the main hormone analysis.

The primary testosterone studies involved 637 randomized participants across different populations. These included resistance-trained men, recreationally active men, healthy middle-aged and older men, and men with benign prostatic hyperplasia.

Most studies administered approximately 500–600 mg of fenugreek extract daily for 8–12 weeks, although some investigated different doses or formulations.

The researchers separated total testosterone and free testosterone into two primary analyses. This was an important decision because those measurements tell us different things, and combining them into a single testosterone outcome could produce misleading conclusions.

Six studies involving 385 participants contributed to the total-testosterone analysis, while five studies involving 334 participants contributed to the free-testosterone analysis.

The researchers also evaluated study quality, potential bias, and the certainty of the evidence rather than relying exclusively on whether the pooled results reached statistical significance.

Fenugreek Produced a Small Increase in Total Testosterone

The first major finding was that fenugreek supplementation was associated with a small increase in total testosterone compared with placebo.

The pooled analysis of six studies involving 385 participants produced a standardized mean difference of 0.25, with a 95% confidence interval of 0.02 to 0.48 and a p-value of 0.037.

In statistical terms, that means the overall result favored fenugreek and narrowly met the conventional threshold for statistical significance.

However, an effect size of 0.25 is relatively small, and the researchers couldn't translate that result into a consistent increase in testosterone measured in ng/dL or nmol/L.

That's because the studies used different populations, laboratory methods, and reporting units. The researchers therefore combined the results using standardized effect sizes rather than a single absolute testosterone measurement.

This is an important limitation when trying to determine whether fenugreek is worth taking.

If a supplement increases someone's testosterone by a small amount that falls within normal day-to-day variation, that may not translate into noticeable changes in libido, muscle growth, strength, or general well-being.

Statistical significance tells us that an observed effect is unlikely to be explained by random sampling alone under the statistical model. It doesn't tell us whether the effect is large enough to matter in everyday life.

The researchers acknowledged this distinction and cautioned against interpreting the small total-testosterone effect as proof of a clinically meaningful benefit.

Free Testosterone Didn't Reliably Increase

This is where the findings become considerably less convincing.

The researchers also examined free testosterone, which represents the small fraction of circulating testosterone that isn't bound to blood proteins.

The pooled analysis included five studies involving 334 participants and produced a standardized mean difference of 0.08, with a 95% confidence interval ranging from −0.48 to 0.63.

The result was not statistically significant, with a p-value of 0.725.

There was also substantial inconsistency between studies, making it difficult to establish whether fenugreek had any reliable effect on free testosterone.

In other words, the small increase in total testosterone was not accompanied by a consistent increase in free testosterone.

That matters because total testosterone alone doesn't provide a complete picture of androgen status. Most circulating testosterone is bound to proteins, primarily sex hormone-binding globulin (SHBG) and albumin.

Changes in those binding proteins can influence total and free testosterone measurements differently.

Free testosterone is relevant to androgen activity, although measuring it accurately can be challenging and the relationship between testosterone measurements and symptoms is more complicated than simply looking at one number.

The important takeaway is that the review did not establish that fenugreek consistently increases the fraction of testosterone available to tissues.

That makes claims about stronger androgenic effects, increased muscle growth, or improved sexual function considerably harder to support.

Why Total and Free Testosterone Matter

It's worth spending a little more time on the difference between total and free testosterone because supplement companies often use these measurements interchangeably.

Total testosterone includes testosterone circulating in three forms: testosterone tightly bound to SHBG, testosterone loosely bound to albumin, and unbound or free testosterone.

Free testosterone represents only a small percentage of total circulating testosterone. Albumin-bound testosterone can also become available to tissues relatively easily, which is why clinicians sometimes discuss bioavailable testosterone rather than free testosterone alone.

A supplement could theoretically increase total testosterone without producing a comparable increase in free testosterone. Changes in SHBG or other aspects of hormone regulation could help explain that difference, although this review did not establish a specific mechanism.

The key point is that increasing total testosterone on a laboratory report doesn't automatically mean someone has experienced a meaningful increase in androgen activity.

This is also why diagnosing testosterone deficiency requires more than a single laboratory measurement. Testosterone concentrations fluctuate throughout the day and can be influenced by sleep, illness, energy availability, medications, and other factors.

When testosterone deficiency is suspected, symptoms and appropriately timed, repeated laboratory testing matter more than one isolated number.

For supplement research, this creates an additional challenge. Even if an ingredient produces a small average increase in total testosterone, researchers still need to demonstrate that the change is reliable, biologically relevant, and associated with meaningful improvements in health or performance.

Fenugreek hasn't convincingly cleared those hurdles.

Did Fenugreek Improve Sexual Function or Libido?

Fenugreek is frequently marketed for more than testosterone. Many supplements also claim that it improves libido, sexual performance, and symptoms commonly associated with aging.

The review examined several studies that measured these outcomes using standardized questionnaires.

Some results favored fenugreek, including improvements in the Aging Males' Symptoms (AMS) questionnaire and the Derogatis Interview for Sexual Function (DISF).

For example, the pooled results showed improvements in overall AMS scores and several symptom domains. The DISF total score also favored fenugreek.

These findings are interesting because they suggest fenugreek preparations may influence certain self-reported symptoms or aspects of sexual function.

However, improvements in sexual-function questionnaires do not establish that testosterone increased or that testosterone caused those improvements.

One study using a fenugreek preparation combined with magnesium, zinc, and vitamin B6 reported favorable sexual-function outcomes without a clear increase in serum testosterone.

That raises two questions. Was the improvement related to fenugreek itself, and if so, did it occur through a mechanism unrelated to testosterone?

The available research can't answer those questions confidently.

The studies also used different products, populations, and questionnaires, making it difficult to determine how broadly the findings apply.

There may be a signal worth investigating for certain sexual-function outcomes, but the evidence is not strong enough to conclude that fenugreek reliably improves libido by boosting testosterone.

That's an important distinction because sexual function is influenced by many factors beyond testosterone, including psychological, neurological, vascular, and relationship-related factors.

What About Muscle Growth and Strength?

Another common claim is that fenugreek can help men build muscle, increase strength, and improve body composition.

This is particularly relevant because several fenugreek studies have been conducted in resistance-trained or physically active men.

The review included supplementary analyses examining body-fat percentage, fat-free mass, bench-press strength, and leg-press strength.

Some findings favored fenugreek:

At first glance, the improvements in body-fat percentage and bench-press strength look promising.

However, these were supplementary findings drawn from a limited number of studies. The researchers cautioned that differences in study populations, formulations, and exercise programs prevented strong conclusions.

More importantly, improvements in strength or body composition cannot automatically be attributed to increased testosterone.

Several of the studies involved structured resistance training, which independently influences strength and body composition.

It's also possible that fenugreek could affect some outcomes through mechanisms unrelated to testosterone. The review did not establish whether that occurred.

The findings certainly justify further investigation, particularly into specific standardized extracts. But they don't demonstrate that fenugreek works as an anabolic supplement or produces meaningful muscle-building effects through testosterone elevation.

If a supplement company claims fenugreek increases muscle growth because it raises testosterone, this meta-analysis doesn't provide convincing evidence for that chain of events.

Does Fenugreek Improve Exercise Performance?

The review also included studies examining exercise-related outcomes, although these weren't part of the primary testosterone analysis.

One study investigated a standardized fenugreek-derived extract in recreationally active men and examined endurance-related measures, including maximal oxygen uptake and fatigue.

Other studies examined strength or body-composition outcomes alongside exercise training.

These results provide some additional context, but they don't establish that fenugreek consistently improves athletic performance.

There are several reasons to be cautious.

First, the studies used different extracts and doses. Second, the exercise programs and performance measurements weren't consistent. Third, improvements in performance could occur independently of changes in testosterone.

The review did not demonstrate that fenugreek is an effective testosterone-mediated performance enhancer.

For athletes, that's the more relevant question. A small change in a laboratory measurement is considerably less interesting than a reproducible improvement in performance.

Until larger, well-controlled studies demonstrate meaningful benefits, I wouldn't recommend fenugreek specifically for increasing endurance performance, strength, or muscle growth.

The Type of Fenugreek Extract Matters

One of the biggest problems with botanical supplement research is that different extracts can contain substantially different concentrations of active compounds.

Fenugreek is a good example.

The studies included in this review used several proprietary preparations, including Testofen, Furosap, and other standardized extracts. These products were not necessarily chemically equivalent.

Some extracts were standardized for particular saponins or other compounds, while others used different extraction methods or formulations.

The study table on pages 6–8 of the review illustrates this problem particularly well. The researchers documented differences in product composition, dose, duration, study population, and funding across the included trials.

Most primary studies used 500–600 mg per day, but one investigated doses of 600, 1,200, and 1,800 mg daily.

It's tempting to look at those numbers and conclude that 600 mg is the appropriate testosterone-boosting dose.

However, the research doesn't establish an effective dose for reliably increasing testosterone, and the authors did not conduct a formal dose-response analysis.

A 600 mg dose of one standardized extract isn't necessarily equivalent to 600 mg of another extract.

That also means the results shouldn't automatically be applied to ordinary fenugreek powder or every supplement containing fenugreek on its ingredient label.

If an ingredient has only been studied in a specific standardized form, the findings are most directly relevant to that form.

Why the Quality of the Evidence Is Such a Problem

This is probably the most important part of the entire review.

Although the total-testosterone analysis produced a statistically significant result, the researchers rated the certainty of that evidence as very low.

They also rated the free-testosterone evidence as very low certainty.

Using the Cochrane Risk of Bias 2 assessment, the researchers found that:

• 11 of the 13 studies had some concerns about bias.

• Two studies had a high overall risk of bias.

• None of the studies was rated as having a low overall risk of bias.

These assessments were influenced by several problems, including incomplete reporting, uncertainty about prespecified outcomes, missing data, and the selection of reported results.

Industry funding or company involvement was also common.

That doesn't automatically invalidate the studies. Industry-funded research can be conducted rigorously, and funding source alone doesn't determine whether a result is trustworthy.

However, when much of the evidence comes from relatively small studies involving proprietary products, transparency and independent replication become especially important.

The researchers also identified concerns about potential publication bias. Because fewer than 10 studies contributed to each primary testosterone analysis, they couldn't reliably perform the usual statistical tests for publication bias.

A statistically significant result supported by very low-certainty evidence should not be treated as an established fact.

The distinction is important because many supplement advertisements focus exclusively on favorable study results without discussing whether those results are reliable enough to support the claims.

How Much Confidence Should We Place in the Results?

The researchers performed sensitivity analyses to determine whether their conclusions changed when certain studies were excluded.

For total testosterone, the overall direction of the effect generally remained favorable toward fenugreek. However, the size and precision of the estimated benefit changed depending on which studies were included.

For example, excluding a study involving men with benign prostatic hyperplasia increased the estimated effect on total testosterone.

For free testosterone, some sensitivity analyses shifted the results in a favorable direction, but the overall findings remained unstable.

This tells us that there may be a genuine small effect on total testosterone in certain populations or with particular formulations.

However, we still don't know whether that effect is clinically meaningful, consistently reproducible, or accompanied by improvements in free testosterone.

The evidence also doesn't identify which men, if any, are most likely to benefit.

A young resistance-trained athlete, a healthy 55-year-old man, and an older man with prostate-related symptoms may respond differently to the same intervention.

Pooling those populations can provide a broader estimate, but it also makes the results harder to apply to an individual.

That's why I think the authors' conclusion was appropriate. The findings are interesting enough to justify further research, but not strong enough to support confident testosterone-boosting claims.

Is Fenugreek Safe?

The review also examined available safety information.

Eight of the 13 included studies reported some form of safety-related data, although the quality and completeness of that reporting varied.

Some trials monitored adverse events, while others included laboratory measurements such as prostate-specific antigen, prolactin, or routine liver and kidney function markers.

No included study reported a serious adverse event attributable to fenugreek.

That's encouraging, but it doesn't establish that long-term supplementation is risk-free.

Most of the studies lasted only 8–12 weeks, and adverse-event reporting was inconsistent. Some trials simply stated that no adverse events occurred without providing much detail about how those events were monitored.

There are also practical considerations outside the review. Fenugreek can cause gastrointestinal symptoms in some people, and concentrated supplements may interact with medications, particularly those affecting blood glucose or blood clotting.

People taking prescription medications should be cautious about adding concentrated herbal extracts without checking for potential interactions.

For healthy adults, short-term use of the studied preparations appeared reasonably well tolerated in the available trials. However, the evidence is insufficient to make strong claims about long-term safety, especially at higher doses.

Does Fenugreek Work as a Natural Testosterone Booster?

I think the answer depends on what someone means by work.

If the question is whether fenugreek has ever produced a measurable increase in total testosterone in randomized controlled trials, the answer is yes. The pooled analysis found a small statistically significant effect.

If the question is whether fenugreek reliably increases free testosterone, the answer is no. The available evidence did not establish that benefit.

If the question is whether fenugreek meaningfully improves muscle growth, strength, libido, or overall health by increasing testosterone, the evidence is not convincing.

Those are three different questions, but supplement marketing often treats them as though they're interchangeable.

A product might advertise that an ingredient increased testosterone in a clinical study and then imply that users can expect improvements in muscle growth, sexual performance, and body composition.

That requires several additional assumptions, none of which this review adequately establishes.

The evidence for a small biochemical effect is considerably stronger than the evidence for meaningful testosterone-related benefits, although even the biochemical evidence is rated very low certainty.

That doesn't mean future research won't identify specific fenugreek extracts that work better than others. It means we shouldn't assume those benefits exist before they've been demonstrated.

What I Think This Study Actually Tells Us

I think fenugreek is a good example of an ingredient that falls into the gap between interesting preliminary research and convincing clinical evidence.

There are enough positive findings to justify studying it further. Some trials have reported favorable changes in testosterone, sexual-function questionnaires, strength, and body composition.

But when researchers examine the entire evidence base, the picture becomes much less impressive.

The increase in total testosterone was small, free testosterone didn't reliably improve, and the overall certainty of the evidence was very low.

Those limitations matter more to me than whether one or two individual studies produced impressive-looking results.

If I were evaluating fenugreek for inclusion in a testosterone-support supplement, I would want larger, independently conducted trials using clearly standardized extracts. Those trials would need to measure total and free testosterone accurately, establish whether any changes were clinically meaningful, and determine whether they translated into improvements in symptoms or physical performance.

I would also want to know whether any benefits persisted over time and whether there were meaningful differences between doses.

Until those questions are answered, I don't think the research supports marketing fenugreek as a reliable testosterone booster.

And I certainly wouldn't build a supplement around the assumption that a small increase in total testosterone automatically translates into greater muscle growth or better sexual performance.

What Actually Matters for Maintaining Healthy Testosterone?

It's worth remembering that testosterone regulation is influenced by many factors beyond supplementation.

Age, body composition, energy availability, sleep, medications, underlying health conditions, and training stress can all affect testosterone concentrations.

For someone who is chronically under-eating, sleeping poorly, or accumulating excessive training fatigue, addressing those issues may be more relevant than adding an herbal supplement.

Likewise, someone with symptoms of testosterone deficiency needs an appropriate evaluation rather than assuming that a product marketed as a natural testosterone booster will solve the problem.

No supplement should be expected to correct a clinically significant hormonal deficiency without evidence that it can actually do so.

That doesn't mean every person needs to obsess over testosterone levels. For most healthy men, maintaining adequate nutrition, managing training stress, sleeping consistently, and staying physically active are sensible foundations for overall health.

If symptoms suggest a genuine hormonal problem, repeated laboratory testing and clinical assessment provide much more useful information than experimenting with multiple testosterone-boosting supplements.

The Bottom Line

A 2026 systematic review and meta-analysis examined 13 randomized, placebo-controlled studies investigating the effects of fenugreek-derived preparations on testosterone and related men's health outcomes.

The researchers found a small statistically significant increase in total testosterone, but no reliable increase in free testosterone.

Some studies also reported improvements in sexual-function questionnaires, body-fat percentage, and strength. However, those findings were not sufficient to demonstrate that testosterone increases caused the improvements.

Perhaps most importantly, the certainty of the evidence for both total and free testosterone was rated very low, and none of the included studies had an overall low risk of bias.

The authors concluded that the available research does not justify clinical or commercial testosterone-boosting claims.

I agree with that interpretation.

Fenugreek may have some interesting biological effects, and certain standardized extracts deserve further investigation. But there's a big difference between an ingredient that produces a small statistical change in testosterone and one that reliably improves testosterone-related health or performance.

At this point, I wouldn't recommend fenugreek specifically for boosting testosterone. The evidence simply isn't strong enough to justify that claim.

About the Author

Matt Mosman, MS, CISSN, CSCS, is the founder and Chief Science Officer of Simply Good Supplements. With a background in exercise science, sports nutrition, and strength and conditioning, Matt focuses on turning research into practical advice that athletes, parents, and everyday active people can actually use.

References

Yang P, Niu Z, Guo J, Huang T, Chang D, Huang X. Effects of oral fenugreek-derived preparations on testosterone-related outcomes in adult men: a systematic review and meta-analysis of randomized placebo-controlled trials. Frontiers in Nutrition. 2026;13:1903508. https://doi.org/10.3389/fnut.2026.1903508.