Does Ashwagandha Increase Testosterone? Reading the Trials

Introduction

Ashwagandha testosterone research centers on a handful of small trials. One eight-week study found testosterone increased by 96.19 ng/dL in the ashwagandha group compared to 18.00 ng/dL in placebo, with statistical significance (p = 0.004). That number gets repeated in marketing. What gets left out: who was studied, how many people, and what else changed during those eight weeks.

Before deciding whether ashwagandha fits your protocol, you need the trial details that ads skip over. This article walks through the study design, population, duration, and endpoints so you can read past the headline. If you are comparing supplements more broadly, Testosterone Supplements for Men: Ingredients and Evidence grades the human data behind common ingredients.

The short answer: ashwagandha raised testosterone more than placebo in resistance-trained men over eight weeks. The longer answer involves reading the methods section, checking the baseline levels, and asking whether the study population matches yours. That is what the rest of this article covers.

Does Ashwagandha Testosterone Research Apply to You?

Every supplement seller lists ashwagandha as a testosterone booster. The trial they cite is usually small, short, and run on a specific population. Before you buy a bottle, you need to know what the evidence actually measured and who it measured it in.

The problem is not whether ashwagandha does something — it is whether the something it does in a trial translates to you. A study of 50 untrained young men over eight weeks tells you what happened to 50 untrained young men over eight weeks. It does not tell you what happens to a 45-year-old who lifts three times a week, or to someone who has been training for years, or to anyone outside that narrow window.

What the Trials Leave Out

Most ashwagandha studies share the same limitations. They are short — often eight to twelve weeks. They are small — frequently fewer than 100 participants. They recruit men who are young and untrained, or stressed and sedentary. None of these groups represent the full range of people asking whether ashwagandha will raise their testosterone.

The trials also rarely measure free testosterone, LH, or FSH — the markers that tell you whether a supplement is working through the hypothalamic-pituitary axis or just shifting binding proteins. Without those numbers, you cannot tell mechanism from noise.

Research on diverse populations — females, older adults, people with different training backgrounds — is still needed. Until those trials exist, the claims outrun the data. If you want to know whether ashwagandha fits your situation, start by reading what the studies actually tested. For a broader look at supplement evidence across ingredients, see Testosterone Supplements for Men: Ingredients and Evidence.

Solution Steps

The Trials That Measured Testosterone Directly

The evidence for ashwagandha testosterone effects comes from a handful of small, short-duration trials. The largest and most cited is an 8-week study of 57 young men (18–50 years old) with little resistance training experience. Half received 300 mg of ashwagandha root extract twice daily; half got placebo. Both groups lifted weights.

The ashwagandha group saw testosterone rise by an average of 96.2 ng/dL. The placebo group saw an increase of 18.0 ng/dL. The difference was statistically significant (p < 0.001). That sounds meaningful until you check the baseline: these were untrained men starting a new lifting program. Resistance training alone raises testosterone in beginners, and the trial does not tell you what portion of the 96 ng/dL came from the supplement versus the training stimulus.

Another trial looked at 60 adults under chronic stress. Ashwagandha supplementation increased testosterone in males (p = 0.038) but not in females (p = 0.989). The study did not report absolute testosterone values or the size of the increase, only that the change over time was statistically significant in one sex. Without those numbers, you cannot compare it to other interventions or decide whether the effect is clinically useful.

What the Trials Actually Measured Beyond Testosterone

The 8-week resistance-training trial also tracked muscle strength and body composition. The ashwagandha group gained more upper-body strength than placebo: bench-press strength increased by 46.0 kg versus 26.4 kg (p = 0.001). Lower-body strength (leg extension) increased by 14.5 kg versus 9.8 kg (p = 0.04). Muscle size increased more in the ashwagandha group as well.

These are the outcomes that matter if you are lifting. The testosterone number is a biomarker; the strength and muscle gains are the endpoints. The trial suggests ashwagandha may help adaptation to resistance training in beginners, but it does not tell you whether the effect persists beyond 8 weeks, whether it applies to trained lifters, or whether the testosterone increase is the mechanism behind the strength gains.

The stress trial measured cortisol and DHEA-S alongside testosterone. Ashwagandha reduced morning cortisol (p < 0.001) and DHEA-S (p = 0.004) compared to placebo. Lower cortisol is consistent with ashwagandha's traditional use as an adaptogen. The testosterone increase in males may be secondary to cortisol reduction rather than a direct effect on the testes or hypothalamus.

Who Was Studied and Who Was Not

Both trials enrolled young to middle-aged adults. The resistance-training trial excluded women. The stress trial included both sexes but found no testosterone effect in women. Neither trial enrolled men with diagnosed hypogonadism (low testosterone confirmed by two morning lab tests). Neither trial tested ashwagandha in men already on testosterone replacement therapy or men with normal baseline testosterone who were not under chronic stress.

The population matters. A supplement that raises testosterone in stressed, untrained men may do nothing for a trained lifter with normal cortisol and a baseline total testosterone of 600 ng/dL. The trials do not tell you what happens in that scenario because they did not study it.

Duration, Dose and What We Do Not Know Yet

The longest trial ran 8 weeks. The dose was 300 mg of a standardized root extract twice daily (600 mg total). No trial has tested ashwagandha for 6 months, 12 months or longer. No trial has compared different doses head-to-head in the same population. No trial has measured sperm count, LH, FSH or estradiol alongside testosterone to clarify the mechanism.

Without longer trials, you do not know whether the effect fades, persists or grows. Without dose-response data, you do not know whether 300 mg once daily would work or whether 900 mg would work better. Without mechanistic data, you do not know whether ashwagandha acts on the testes, the pituitary, the adrenal glands or all three.

These are not small gaps. They are the difference between "this might help some people in some contexts" and "this is a reliable tool with a known dose and duration."

Tips and Tricks

Before you buy a bottle based on a headline, here is how to read the fine print.

Check the Study Duration and Size

The ashwagandha trials that measured testosterone ran eight weeks, sometimes less. The sample sizes were small — often fewer than 60 men total, split between treatment and placebo. When you see a supplement claim that cites "clinical studies," ask how long the study ran and how many people finished it. A twelve-week trial with 200 participants carries more weight than an eight-week trial with 50.

One trial showed testosterone rising during the ashwagandha phase and then dropping back toward baseline when participants switched to placebo. The sample size for that comparison was 19 men. That is not a large enough group to call the effect durable.

Look for the Comparison Group

Many ashwagandha studies enrolled men who were also starting a resistance-training program. The placebo group trained too, so the design isolates the supplement's effect. But if you are not training, you cannot assume the same testosterone change applies to you. The trials tested ashwagandha plus training, not ashwagandha alone in sedentary men.

When a supplement seller says "increases testosterone," check whether the cited trial included exercise. If it did, the exercise may be doing most of the work.

Understand What the Number Means

One study reported a testosterone increase of about 96 ng/dL in the ashwagandha group versus 18 ng/dL in placebo. That sounds large until you look at the starting levels and the confidence intervals. The trial also measured muscle size, strength and markers of muscle damage — secondary endpoints that help explain whether the testosterone change translates to anything you can feel or measure in the gym.

Testosterone is one number on a panel. If you are considering ashwagandha because your own testosterone is low, get a full morning test first: total and free testosterone, LH, SHBG. That tells you whether your testicles are underproducing or whether the signal from your brain is weak. Ashwagandha is not a replacement for diagnosing the cause.

Evaluate the Dose and Extract Type

The trials used 300 mg of ashwagandha root extract twice daily — 600 mg total. The extracts were standardized, meaning the active compounds were measured and consistent batch to batch. Many over-the-counter supplements do not specify the extraction method or the percentage of withanolides, the compounds thought to be active.

If the label does not tell you the extract type and the dose used in the trial, you cannot assume you are taking the same thing the researchers tested. For a detailed look at how supplement ingredients are graded by the human evidence behind them, see Testosterone Supplements for Men: Ingredients and Evidence.

Know the Limits of the Evidence

The ashwagandha trials enrolled young to middle-aged men with little resistance-training experience. None of them tested ashwagandha in men diagnosed with hypogonadism, and none compared it head-to-head with prescription options like enclomiphene or TRT. The studies measured testosterone as one of several endpoints; they were not designed to treat low testosterone as a medical condition.

If you are looking at ashwagandha because a telehealth ad suggested it, remember that the trials did not study it that way. The evidence supports a modest effect in men who are also training, not a standalone treatment for low testosterone.

Conclusion

The trials show that ashwagandha can raise testosterone in some populations, but the effect is not universal. The clearest signal comes from studies of men under stress or training hard: an 11% to 14.7% increase over placebo in 8 to 16 weeks. In one study of men and women with stress and fatigue, the testosterone change was not statistically significant compared with placebo.

The populations were small — typically 30 to 60 participants per arm. The durations were short. The funding often came from ashwagandha manufacturers. These are not disqualifying facts, but they are worth knowing before you buy.

If you test twice in the morning and your total testosterone is below 300 ng/dL, ashwagandha is not the first lever. Talk to your doctor about whether you need further workup or prescription treatment. If your levels are in the 400s or 500s and you are managing stress or training volume, ashwagandha may be worth an 8-week trial with before-and-after bloodwork.

The evidence is thin, but it is not absent. The number that matters is the one on your own lab report, tested the same way before and after. That is the only way to know if it worked for you.

For a broader look at what moves testosterone without a prescription, see How to Increase Testosterone Naturally: What Actually Moves the Number.