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How Long Does Ashwagandha Take to Work? Timeline Explained
WellnessChecked Editorial · October 2026
How Long Does Ashwagandha Take to Work? Timeline Explained
How long ashwagandha takes to work, based on what trials measured: most ran 6 to 12 weeks, with stress, sleep and testosterone results reported at 8 to 10 weeks.
⚡ Quick AnswerLast Reviewed: October 2026
Most ashwagandha trials measured results after 6 to 12 weeks of daily use, and there's no reliable data on effects in the first few weeks. In the best-known KSM-66 trials, stress and cortisol were measured at 60 days, sleep at 8 to 10 weeks, and testosterone in young men doing strength training at 8 weeks. The effects were modest and the trials were small. NCCIH says ashwagandha may be safe for up to about three months; long-term safety isn't known.
What the Trials Measured, and When
Weeks 1–4: No reliable data. The trials we found didn't report results this early, so noticing nothing in the first month tells you very little.
6–8 weeks: According to the NIH Office of Dietary Supplements, a 2021 review of seven trials in 491 adults found ashwagandha reduced stress, anxiety, sleeplessness, fatigue and serum cortisol over six to eight weeks, at 240 to 1,250 mg a day.
8 weeks: In 57 young men starting resistance training, 300 mg of KSM-66 twice daily (600 mg a day) led to bigger strength gains and a larger rise in testosterone than placebo. The trial was small and the extract was supplied by its maker.
60 days: In 64 adults with chronic stress, 300 mg of KSM-66 twice daily lowered stress scores, and serum cortisol fell about 28% from baseline. This trial didn't measure testosterone.
8–10 weeks: In a 10-week trial of 60 adults with insomnia, the KSM-66 group fell asleep faster than the placebo group. A 2021 meta-analysis found sleep benefits were clearer at 600 mg a day, after at least 8 weeks, and in people with insomnia.
Beyond 3 months: Not well studied. NCCIH says ashwagandha may be safe for up to about three months, and long-term safety isn't known.
Why We Can't Give a Week-by-Week Timeline
Trials report results at their end point, usually 6 to 12 weeks, not week by week. They show that an effect was seen by that point, not when it started or whether you personally will notice it. The extract and dose matter too: KSM-66 (root only) was studied at 300 to 600 mg a day, while root-and-leaf extracts such as Sensoril were studied at 125 to 500 mg a day. Not every trial was positive; one 12-week trial of 400 mg a day didn't reduce perceived stress. Most trials were small, run mainly in India, and many used extract supplied by its maker.
Consistency matters more than the time of day. Every trial above used daily dosing, once or twice a day. Our guide to the best time to take ashwagandha covers timing, and our KSM-66 guide covers that extract's research.
Safety While You Wait
Stomach upset and drowsiness are the most common side effects. Rarely, ashwagandha has been linked to liver injury, typically appearing 2 to 12 weeks after starting; stop and see a doctor if you notice yellow skin or eyes, dark urine or itching. It can raise thyroid hormone levels and may interact with thyroid, diabetes, blood pressure, sedative and immunosuppressant medicines. See our article on ashwagandha side effects for more.
Most trials measured results after 6 to 12 weeks of daily use. Stress and cortisol changes were reported at six to eight weeks and at 60 days, sleep at 8 to 10 weeks, and testosterone in young men doing strength training at 8 weeks. There's no reliable data on earlier effects.
It depends on the extract. KSM-66 (root only) was studied at 300 to 600 mg a day, often 300 mg twice daily. Root-and-leaf extracts such as Sensoril were studied at lower doses, 125 to 500 mg a day. Choose a product that names its extract and dose, and check with your doctor if you take any medicines.
Possibly, but don't expect a quick change. Trials measured how people felt over weeks, not in the hours after a dose, and the effects were modest. Drowsiness is common, but it's a side effect rather than a sign of benefit.
The trials used daily dosing, once or twice a day, for 6 to 12 weeks, so that's what was studied. NCCIH says it may be safe for up to about three months; long-term safety isn't known.
Most trials ended by 12 weeks, so if you've noticed nothing by then, it's unlikely to start working later. Check that your product names its extract and dose, and talk to your doctor about other causes of stress, poor sleep or low energy, especially before continuing beyond about three months.
Disclaimer: For informational purposes only. All products are dietary supplements — not medicines. Not intended to diagnose, treat, cure or prevent any disease. These statements have not been evaluated by the FDA. Individual results may vary. Always consult a qualified healthcare professional. We earn affiliate commissions via links on this page. Full disclaimer →
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