Ashwagandha for Testosterone and Energy: What the Studies Show
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Ashwagandha for Testosterone and Energy: What the Studies Show

ByRovuno Reviews Team
Reviewed by the RovunoReviews Research Team · Reviewed against our Review Methodology · Updated September 2026

Medical disclaimer: This article is for informational purposes only and is not medical advice. Individual results vary. Consult a healthcare professional before starting any supplement, especially if you take other medications or have a liver, kidney, heart, or thyroid condition. Statements have not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease.

Ashwagandha’s reputation as a stress-support herb has expanded into testosterone and strength claims, backed by a growing, if still fairly small, set of clinical trials in men doing resistance training. This is a distinct body of research from ashwagandha’s studied effects on thyroid hormones or sleep, which we cover separately.

Quick Answer

In an 8-week randomized, placebo-controlled trial of young resistance-trained men, 600 mg/day of a standardized ashwagandha root extract (KSM-66) was associated with significantly greater increases in testosterone, muscle strength, and muscle size compared to placebo, along with better recovery markers. Other trials in older or higher-stress men have examined ashwagandha’s effects on stress hormones and vitality. The extract was well tolerated in these trials, but most of the positive testosterone data comes from a handful of studies using specific standardized extracts and doses, not “ashwagandha” as a generic, undifferentiated category.

The Strength and Testosterone Trial

The most-cited study in this space is an 8-week, randomized, double-blind, placebo-controlled trial in 57 healthy men aged 18-50 with minimal prior resistance-training experience (50 completed the study). The treatment group took 300 mg of a standardized ashwagandha root extract twice daily (600 mg/day total) while performing supervised resistance training three days a week; the control group did the identical training with a placebo. Reviewed by the RovunoReviews Research Team

The Stress-Hormone Connection

Ashwagandha is classified as an adaptogen, and its best-established mechanism involves modulating the body’s cortisol (stress hormone) response. A separate randomized, placebo-controlled crossover trial in aging, overweight men examined ashwagandha’s broader hormonal and vitality effects, reflecting ongoing research interest in whether lowering chronic stress-hormone signaling has downstream benefits for energy and androgen status in men outside the young, actively-training population studied in the strength trial above.

What This Doesn’t Mean

This research doesn’t support ashwagandha as a treatment for a diagnosed low-testosterone medical condition. Only a doctor can diagnose hypogonadism, and that’s a different question from the general energy, strength, and recovery support studied here in a specific population (young, resistance-training men) using a specific standardized extract and dose. It’s also worth being clear that this is a different research thread from ashwagandha’s effects on thyroid function or sleep, which involve different mechanisms, different studies, and different populations. See our separate guides on those topics if that’s what you’re researching.

Dosing and Safety

The studied dose associated with testosterone and strength benefits was 600 mg/day of a standardized root extract (300 mg twice daily), taken for 8 weeks alongside a structured resistance-training program. The supplement was not tested as a substitute for training. Typical studied doses across the broader ashwagandha literature range from about 300-600 mg/day of standardized extract, generally well tolerated over trial durations of 8-12 weeks. As with any supplement affecting hormone or stress pathways, avoid use during pregnancy, and check with a doctor if you have an autoimmune condition or a thyroid disorder that requires monitoring.

Bottom Line

For healthy, resistance-training men, a specific standardized ashwagandha extract has decent trial evidence for supporting testosterone alongside strength and recovery gains. It’s not a universal fix for low energy or a substitute for a medical evaluation, and the positive evidence is still based on a relatively small number of trials using specific extracts and doses.

Frequently Asked Questions

Q: Does ashwagandha raise testosterone in every man who takes it?
A: The clearest evidence comes from a specific trial in young, resistance-training men using a standardized extract (600 mg/day) alongside a structured training program. It isn’t established that any ashwagandha product at any dose produces the same effect in every population.

Q: Is this the same research as ashwagandha’s effects on sleep or thyroid function?
A: No. This is a separate body of research focused on stress, strength, and testosterone. See our guides on ashwagandha’s effects on thyroid and liver markers, and on combining ashwagandha with melatonin for sleep, for those specific topics.

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