What does ashwagandha do for men? What the research does and doesn't show

Most human ashwagandha trials happen to enroll men, which is why "ashwagandha for men" mostly points to research on testosterone, muscle strength, stress and cortisol rather than a distinct male-specific benefit. A 2026 meta-analysis found small increases in testosterone and muscle strength; the narrower trials on fertility and sexual function tell a more mixed story than general summaries usually let on.

What the evidence doesn't support

It doesn't support ashwagandha as a treatment for low testosterone, infertility, or erectile difficulty — those are diagnoses a doctor makes and manages, and the trials that touch on them studied narrow, already-diagnosed groups, not general use. It doesn't support root powder specifically for any of the outcomes below; every trial used an extract except the infertility studies, which used a much higher dose of powder than a typical capsule label carries. And it doesn't support an effect on libido or sexual performance in men without a diagnosed condition — no trial measured that in a general population.

What the trials found

The broadest data point is a 2026 meta-analysis of 20 randomized trials (1,249 participants, both sexes though most trials skewed male) looking at cognitive function, muscle strength, testosterone, body weight and body fat. It found a small but statistically significant increase in testosterone and a larger increase in muscle strength versus placebo — with the strength effect concentrated in people who were already physically active, not showing up in untrained groups. No effect was found on body weight or body fat. A single 16-week trial of a low-dose extract in overweight men aged 40-70 found testosterone and DHEA-S rose more than placebo, but fatigue, vigor, and sexual and psychological wellbeing showed no significant difference from placebo — the hormone number moved without a matching change in how the men said they felt.

Two open-label trials, with no placebo group, tested 5 g/day of root powder — several times a typical capsule label amount — in men already undergoing infertility evaluation. One, in 60 men, found lower measured stress markers and improved semen-quality measures compared with the men's own starting point, with 14% of partners becoming pregnant during the study. A second, in 180 men, found several semen chemistry markers shifted toward levels seen in fertile controls. Neither had a placebo group, and both enrolled men already being medically evaluated for infertility — not a general population.

A separate placebo-controlled trial in 86 men with a formal diagnosis of psychogenic erectile difficulty found both the treatment and placebo groups improved on a standard scale, with no significant difference between them — a genuine null result. And a well-designed 2012 trial in 64 adults with chronic stress (not limited to men) found 600 mg/day of a concentrated extract lowered both self-reported stress scores and cortisol versus placebo over 60 days, covered in more depth on our ashwagandha and cortisol review.

Questions people ask

What does ashwagandha do for men?

Mostly it means what the men-heavy body of research above has measured: a small testosterone increase, a larger muscle-strength effect in physically active people, and stress and cortisol reductions in trials that weren't restricted to men in the first place.

How much ashwagandha per day for males?

No dose has been established specifically for men as a category. The trials above range from 21 mg/day of a standardized extract up to 5 g/day of root powder in a diagnosed infertility population, with different results at each end.

Is ashwagandha good for men's testosterone or muscle?

Pooled data shows small, statistically significant improvements in both, with the muscle effect mainly benefiting people already training. Full detail is on our ashwagandha and testosterone review.

Does ashwagandha help male fertility?

Two studies in men already undergoing infertility evaluation found improved semen-quality measures at 5 g/day of root powder, with no placebo group in either study. That's a specific medical population at a high dose, not a general fertility claim.

When to talk to a doctor

Low testosterone, infertility and erectile difficulty are diagnoses a doctor manages with testing, not something to self-treat with a supplement. If any of those are a concern, a blood test and a doctor's evaluation will say more than a general article can. If you take a sedative, thyroid medication, or an immune-suppressing drug, talk to a doctor before adding any supplement.

Related reading: ashwagandha and testosterone, ashwagandha and cortisol, and ashwagandha, energy and focus.