Ashwagandha
Ashwagandha is a herbal supplement — ashwagandha is an herb that contains compounds studied for their potential influence on physiological systems. 10 peer-reviewed studies are available in our database. Common forms include Root Extract, KSM-66, Sensoril.
Content reviewed by Zynava Research Team · Last updated February 2026 · Editorial policy
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What Is Ashwagandha?
Ashwagandha is an herb that contains compounds studied for their potential influence on physiological systems. It has been traditionally used in Ayurvedic medicine.
Key fact: Some extracts are standardized to withanolides.
Key Facts About Ashwagandha
- KSM-66 and Sensoril are standardized extracts
- Look for withanolide content
- Traditional root vs modern extracts
What Research Has Examined
- Often studied for its potential role in stress response
- Frequently researched in relation to sleep quality
- Sometimes explored for energy and vitality support
- Commonly investigated in the context of cognitive function
Ashwagandha Supplement Forms
Root Extract
Most common form; standardized for withanolide content
Root Powder
Whole herb form; may have variable potency
Leaf Extract
Less common; different compound profile
Typical Dosage Range
Supplement labels typically show 300–600 mg of root extract per serving Often standardized to contain certain levels of withanolides
Optimal dosage may vary based on individual factors. Always consult a healthcare professional before starting any supplement regimen.
Safety & Considerations
- Generally well-tolerated at recommended doses
- May cause digestive discomfort in some individuals
- High doses may cause drowsiness
- Pregnant or nursing individuals should consult healthcare providers
Explore Ashwagandha Supplements
Use our research tool to explore ashwagandha supplements and see what studies have examined.
Research Studies on Ashwagandha
Our database contains 10 peer-reviewed studies examining ashwagandha. Below are selected recent studies:
Health Goals Associated with Ashwagandha
Research has examined ashwagandha in relation to several health areas:
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Frequently Asked Questions About Ashwagandha
What is Ashwagandha?
Ashwagandha is an herb that contains compounds studied for their potential influence on physiological systems. It has been traditionally used in Ayurvedic medicine.
What are the different forms of Ashwagandha?
Ashwagandha is available in several supplemental forms including Root Extract, KSM-66, Sensoril, Shoden. Some extracts are standardized to withanolides.
What health goals is Ashwagandha associated with?
Research has examined ashwagandha in relation to several health areas including sleep stress. The best supplement depends on individual factors — consult a healthcare professional for personalized guidance.
Is Ashwagandha safe to take?
Generally well-tolerated at recommended doses May cause digestive discomfort in some individuals High doses may cause drowsiness Pregnant or nursing individuals should consult healthcare providers Always consult a healthcare provider before starting any supplement, especially if you take medications or have existing health conditions.
Natural Food Sources of Ashwagandha
Understanding the natural food sources of ashwagandha provides valuable context for supplementation decisions. For many people, a well-planned diet can contribute meaningfully to their ashwagandha intake, though individual needs may vary.
- Ashwagandha root — Traditionally prepared as a powder (churna) mixed into warm milk with honey
- Ashwagandha tea — Dried root can be brewed as a decoction — traditionally simmered for 15-20 minutes
Dietary Context
Ashwagandha (Withania somnifera) is not a common food ingredient in Western diets but has been used for over 3,000 years in Ayurvedic medicine. The root is the most commonly used part. In its native regions of India and North Africa, it grows as a small shrub. Unlike vitamins and minerals that are widely distributed in foods, ashwagandha's active compounds (withanolides) are unique to this plant.
Absorption: Food vs. Supplements
Withanolides, the active compounds in ashwagandha, are fat-soluble. Traditional preparations in warm milk (which contains fat) may enhance absorption. Modern standardized extracts are designed to provide consistent withanolide concentrations.
Practical Tips
- Traditional Ayurvedic preparation involves mixing ashwagandha powder in warm milk with a sweetener
- The herb has a distinctive bitter, earthy taste that is masked well in milk-based drinks
- Ashwagandha is not found in common Western foods — supplementation is the primary modern route
How to Take Ashwagandha
Getting the most from ashwagandha supplementation involves more than just choosing the right product. When and how you take it can significantly affect absorption and effectiveness.
Best time to take: Morning or evening, depending on the desired effect
With or Without Food
Best taken with food to improve absorption and reduce any potential stomach discomfort. Traditional Ayurvedic preparations use warm milk as a delivery vehicle.
How Often
Typically taken once or twice daily. Effects may take 4-8 weeks of consistent supplementation to fully manifest.
Practical Tips
- Morning dosing is common for energy and stress resilience during the day
- Evening dosing may support relaxation and sleep quality
- Traditional preparation with warm milk enhances absorption of fat-soluble withanolides
- Cycling (e.g., 8 weeks on, 2 weeks off) is sometimes recommended though not universally agreed upon
Important Interactions
- May interact with thyroid medications — monitor thyroid levels if supplementing
- May interact with immunosuppressant drugs
- May have additive effects with sedatives or anti-anxiety medications
This is not an exhaustive list of interactions. Always consult a healthcare provider or pharmacist about potential interactions with your specific medications and health conditions.
Where to Find Ashwagandha Supplements
If you are considering ashwagandha supplementation, choosing a quality product from a reputable retailer is an important step. Here are some trusted options where you can browse and compare ashwagandha supplements.
How to Choose a Quality Ashwagandha Supplement
- Verify the expiration date and that the product is stored appropriately
- Research the brand — established companies with transparent testing are generally more reliable
- Consider subscription options for supplements you plan to take long-term — many retailers offer discounts
- Check the other ingredients list for potential allergens (soy, gluten, dairy, nuts)
To explore supplements by ingredient or health goal, try our AI Supplement Advisor.
Research Highlights: Ashwagandha
Published research on ashwagandha spans 2020 to 2025 and includes 4 meta-analysiss, 1 observational study, 1 systematic review. The selected summaries below provide an overview of what these studies examined and found. Evidence quality varies across studies, and findings should be discussed with a healthcare provider.
Ashwagandha for stress and anxiety
Reduces stress by 39%. Lowers cortisol levels. Improves sleep quality.
Source: View full study on PubMed
The effect of Withania somnifera (Ashwagandha) on mental health symptoms in individuals with mental disorders: systematic review and meta-analysis
A systematic review and meta-analysis on Ashwagandha's effect on mental health symptoms in individuals with mental disorders. Found evidence supporting the effectiveness of Ashwagandha in improving anxiety, depression, stress, and sleep quality symptoms. Concluded that future trials should replicate the anxiety finding in larger samples and further clarify its role in depression and insomnia treatment.
Safety of 12-Months Administration of Ashwagandha (Withania somnifera) Standardized Root Extract in Healthy Adults: A Prospective, Observational Study
A prospective, multi-center, observational clinical study (N=191) evaluating the long-term safety of Ashwagandha Root Extract (ARE) over 12 months. Found the extract to be safe with no clinically significant changes in liver enzymes (ALT/AST). Reported significant decreases in serum cortisol and significant increases in serum testosterone (free and total), along with enhanced health-related quality of life.
Ashwagandha (Withania somnifera) for the treatment and enhancement of mental and physical conditions: A systematic review of human trials
A systematic review of 41 human trials on Ashwagandha's effects on mental and physical conditions. Found the strongest evidence for therapeutic efficacy is the alleviation of stress and anxiety symptoms. Concluded that Ashwagandha has a potentially large array of therapeutic applications, but further research with robust designs is required due to significant heterogeneity and small sample sizes in existing studies.
Effects of Ashwagandha (Withania Somnifera) on stress and anxiety: A systematic review and meta-analysis
A systematic review and meta-analysis of 9 studies (558 patients) on the effects of Ashwagandha on stress and anxiety. Found significant reductions in perceived stress, anxiety, and serum cortisol levels compared to placebo. Doses ranged from 125–600 mg daily for 30–90 days, with both root-only and root-and-leaf formulations showing benefits.
Source: View full study on Explore
Effect of Ashwagandha (Withania somnifera) extract on sleep: A systematic review and meta-analysis
A systematic review and meta-analysis of 5 RCTs (400 participants) on the effect of Ashwagandha extract on sleep. Found a small but significant effect on overall sleep (SMD -0.59). The effects were more prominent in the subgroup of adults diagnosed with insomnia, with treatment dosage ≥600 mg/day and duration ≥8 weeks. Also improved mental alertness and anxiety.
Source: View full study on PLOS One
The research summaries above are based on published peer-reviewed studies and are provided for informational purposes only. Study findings may not apply to all individuals, and the presence of a study summary does not constitute an endorsement of ashwagandha for any specific health condition. Always consult a qualified healthcare professional before making decisions based on research findings.
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