Most men benefit from 300 to 600 mg of ashwagandha root extract per day. That range covers the doses used in the majority of clinical trials on testosterone, stress, muscle strength, and sleep. The exact amount depends on your goal and the type of supplement you’re taking, since root extract and raw root powder are very different concentrations.
Extract vs. Powder: Why the Numbers Look Different
The single biggest source of confusion with ashwagandha dosing is the difference between standardized root extract and plain root powder. Most capsules on the market contain a concentrated extract (brands like KSM-66 or Sensoril), where 300 to 600 mg delivers meaningful levels of the active compounds called withanolides. Raw root powder is far less concentrated. Studies using whole root powder have gone as high as 5,000 to 6,000 mg per day to achieve similar effects.
When you see a dose recommendation, check which form is being discussed. If your supplement label says “root extract, standardized to 5% withanolides,” you’re in extract territory and 300 to 600 mg is the standard range. If you’re using loose powder in a smoothie or mixed with milk, you’ll need substantially more to get the same results.
Doses by Goal
Testosterone
The most-cited trial on testosterone gave men 300 mg of root extract twice daily (600 mg total) for eight weeks. The ashwagandha group saw testosterone levels rise by about 96 ng/dL, compared to just 18 ng/dL in the placebo group. A 2022 study replicated this with the same 600 mg daily dose and found similar improvements in both testosterone and sexual function. One older study used 5 g of plain root powder daily for three months in infertile men and also reported improved testosterone levels, but that’s a much larger volume of supplement to take each day. For most men, 600 mg of a standardized extract is the practical choice.
Stress and Cortisol
An international psychiatric taskforce jointly formed by the World Federation of Societies of Biological Psychiatry and the Canadian Network for Mood and Anxiety Treatments provisionally recommends 300 to 600 mg of root extract (standardized to 5% withanolides) for generalized anxiety. NIH-reviewed trials found that benefits were generally greater at 500 to 600 mg per day compared to lower doses. One concentrated root-and-leaf extract (Shoden brand) showed effects at just 120 mg per day, but that formulation has a much higher withanolide concentration than standard root extracts.
Muscle Strength and Body Composition
Men doing resistance training have seen real results with ashwagandha. In one eight-week trial, men taking 300 mg of root extract twice daily increased their bench press by an average of 46 kg, compared to 26 kg in the placebo group, alongside measurable growth in arm muscle size. A separate 12-week study using 500 mg of aqueous root extract improved both upper and lower body strength and body composition in active men. A systematic review of the exercise research concluded that 300 to 500 mg of root extract daily, taken for 8 to 12 weeks, is the effective range for sports performance.
How and When to Take It
There’s no single best time of day. Some clinical trials had participants take it in the evening after dinner, while others split the dose into morning and night. Splitting into two doses (for example, 300 mg in the morning and 300 mg at night) is the most common setup in research, but single daily doses also worked in several trials. If you’re taking it primarily for sleep or stress relief in the evening, a nighttime dose makes intuitive sense. If you’re using it for workout performance, morning or pre-workout timing is reasonable.
Ashwagandha can be taken with or without food. The powder mixes easily into warm milk, water, or a smoothie. Taking it with a meal may reduce the chance of mild stomach discomfort, which is the most commonly reported side effect.
How Long to Take It
Most clinical trials last 8 to 12 weeks, which means long-term safety data beyond a few months is limited. A common approach is to take ashwagandha for 8 to 12 weeks, then pause for 2 to 4 weeks. During that break, you can reassess whether the supplement is still helping and watch for any side effects that might have developed gradually. If your symptoms return during the break, that’s a reasonable signal to restart another cycle. If you feel no different off it, you may not need to continue.
Upper Limits and Side Effects
Clinical trials have used extract doses up to 1,250 mg per day without major safety concerns in healthy adults over short periods. That said, most benefits plateau around 500 to 600 mg of extract, so going higher doesn’t clearly add value. The most common side effects are mild: stomach upset, drowsiness, and loose stools. These tend to be more likely at higher doses.
There is no officially established upper limit for ashwagandha, partly because long-term studies are still sparse. Starting at 300 mg per day and increasing to 600 mg after a week or two is a sensible way to gauge your tolerance.
Who Should Avoid It
Ashwagandha is not appropriate for everyone. The National Center for Complementary and Integrative Health specifically warns against use in people with autoimmune disorders, thyroid conditions, or hormone-sensitive prostate cancer (since it can raise testosterone). It may also interact with medications for diabetes, high blood pressure, seizures, and thyroid hormones, as well as sedatives and immunosuppressants. If you take any of these medications or have these conditions, ashwagandha is worth discussing with your doctor before starting.