At a glance:
- Ashwagandha may reduce serum cortisol levels by up to 28% compared with a placebo (Chandrasekhar et al., 2012).
- Controlled studies show statistically significant improvements in perceived stress scale scores and measures of anxiety within 4–8 weeks.
- Standardized root extract at a dose of 300–600 mg per day is generally well tolerated, but is not recommended during pregnancy or for people with thyroid problems.
- Adaptogens complement—but do not replace—sleep, physical activity and other evidence-based recovery methods.
Ashwagandha’s role in stress management is attracting growing attention among athletes and people coping with everyday stress as the evidence develops. Withania somnifera—commonly known as ashwagandha—is one of the most extensively studied adaptogens, with its effects on psychological and physiological stress repeatedly measured in controlled trials. In this review, we look at what the science actually says about the relationship between adaptogens and stress.
How does ashwagandha affect the body’s stress response?
Ashwagandha is classified as an adaptogen—a substance that helps the body adapt to stress by modulating the hypothalamic-pituitary-adrenal (HPA) axis. The HPA axis is the physiological system that controls the release of cortisol, the main stress hormone. Ashwagandha’s main bioactive compounds, withanolides, are thought to inhibit cortisol synthesis when the HPA axis is overactive.
In a randomized controlled trial involving 64 adults with chronic stress, the ashwagandha root extract group (300 mg two times a day) showed a 44% reduction in Perceived Stress Scale (PSS) scores and a 27.9% reduction in serum cortisol levels compared with the placebo group (Chandrasekhar et al., 2012). These are the most frequently cited figures in adaptogen research.
Chronic stress is also often accompanied by the vicious cycle described in Stress—the No. 2 cause of excess weight: elevated cortisol promotes the accumulation of body fat, which in turn increases the inflammatory burden and fatigue.
What do clinical studies show about the effectiveness of adaptogens?
In a systematic review, Pratte et al. (2014) analyzed data from human studies and concluded that ashwagandha shows promise across several measures of stress and anxiety, but the methodological quality of the studies is inconsistent (Pratte et al., 2014). It is therefore premature to describe it as a clinical treatment in the medical sense.
In a double-blind controlled trial by Langade et al. (2019) (n=60), 600 mg of ashwagandha root extract per day produced statistically significant improvements in sleep quality and reductions in anxiety symptoms compared with a placebo (Langade et al., 2019). Sleep and stress are closely linked: the article Testosterone and stress explains how sleep deprivation disrupts hormonal balance, including testosterone and cortisol pathways.
According to the World Health Organization, chronic stress directly affects mental health conditions and is one of the main contributors to the global burden of disease. This highlights why evidence-based approaches—both lifestyle changes and critical evaluation of potential supplements—are so important.
Who benefits most from adaptogens?
Research to date has focused mainly on adults with chronic but nonclinical stress. The data suggest that ashwagandha is best suited to people who experience persistent low-level stress, such as athletes with a high training load, adults under stress at work or people with chronic sleep problems.
As an athlete, it is important to understand that stress management is an integral part of complete recovery. Creating a training program: a complete guide discusses recovery as a core component of the training cycle—adaptogens may be one additional tool, but they do not replace adequate sleep or structured recovery periods.
Combining nonpharmacological approaches—such as using an acupressure mat, breathing exercises and regular physical activity—may provide additional stress relief, although direct comparative studies on combining ashwagandha with other nonpharmacological interventions are scarce.
Is ashwagandha safe, and what are the side effects?
Ashwagandha is generally well tolerated in clinical studies. Mild gastrointestinal discomfort is the most commonly reported side effect (Chandrasekhar et al., 2012; Langade et al., 2019). Use during pregnancy and breastfeeding is not recommended because there are insufficient safety data. Slight increases in thyroid hormone levels have been observed in isolated cases, so if you have thyroid problems, you should consult a doctor before taking it.
Studies have used standardized root extract doses ranging from 300–600 mg per day over 8–12 weeks. The evidence base is stronger for root extract (such as standardized KSM-66 or Sensoril products) than for leaf- or seed-based preparations.
References
- Chandrasekhar K, Kapoor J, Anishetty S. (2012). A prospective, randomized double-blind, placebo-controlled study of safety and efficacy of a high-concentration full-spectrum extract of Ashwagandha root in reducing stress and anxiety in adults. Indian J Psychol Med. 34(3):255–262. PMID: 23439798
- Pratte MA, Nanavati KB, Young V, Morley CP. (2014). An Alternative Treatment for Anxiety: A Systematic Review of Human Trial Results Reported for the Ayurvedic Herb Ashwagandha (Withania somnifera). J Altern Complement Med. 20(12):901–908. PMID: 25405876
- Langade D, Kanchi S, Salve J, Debnath K, Ambegaokar D. (2019). Efficacy and Safety of Ashwagandha (Withania somnifera) Root Extract in Insomnia and Anxiety: A Double-blind, Randomized, Placebo-controlled Study. Cureus. 11(9):e5797. PMID: 31728244
Frequently asked questions
How quickly does ashwagandha start working for stress?
Clinical studies have found statistically significant results for perceived stress and cortisol levels after 4–8 weeks of consistent use. There is no documented evidence of a faster effect.
Can ashwagandha replace prescribed anxiety medication?
No. Ashwagandha is a dietary supplement, not a medicine. If you have a clinical anxiety disorder, you should see a doctor. Adaptogens may offer additional support, but they do not replace medical treatment.
Which form of ashwagandha has been studied most extensively?
Most clinical studies have used standardized root extract at a dose of 300–600 mg per day. KSM-66 and Sensoril are the commercial standardized extracts most commonly used in studies.
Is ashwagandha suitable for athletes?
Yes, adaptogens are popular among athletes for managing stress caused by training load and supporting recovery time. Clinical studies show a positive effect on cortisol, but few trials have specifically involved athletes.
Can you take ashwagandha long term?
Most studies have lasted 8–12 weeks. There is limited research on long-term safety beyond 6 months. You are advised to take breaks and consult a doctor if you have health problems.
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