Use the toggle to switch between the simple Overview and the Technical Data content.
Ashwagandha (Withania somnifera): Benefits, Uses, and How to Choose
Overview
Plain-English information for everyday use1. What Is Ashwagandha?
Ashwagandha is an adaptogenic herb used for centuries in Ayurveda. Today it’s taken mainly as a standardized root extract to help the body cope with everyday stress and support calm, restful sleep, and general vitality.
Ashwagandha (Withania somnifera) is a small evergreen shrub native to India and parts of Africa and the Middle East. Its root has been a cornerstone of Ayurvedic tradition for thousands of years, where it is classed as a Rasayana — a rejuvenating tonic for energy and resilience. Singh N et al. Afr J Tradit Complement Altern Med. 2008. Open Source ↗NIH Office of Dietary Supplements. Ashwagandha (Health Professional Fact Sheet). 2024. Open Source ↗
It is best known as an adaptogen: a botanical traditionally used to help the body adapt to everyday physical and mental demands and return to a steady, balanced state. NIH Office of Dietary Supplements. Ashwagandha (Health Professional Fact Sheet). 2024. Open Source ↗
The active compounds are a family of naturally occurring molecules called withanolides (including withaferin A and withanolide A). Quality root extracts are standardized to a set percentage of these compounds so each dose is consistent. Mirjalili MH et al. Molecules. 2009;14(7):2373-2393. Open Source ↗NIH Office of Dietary Supplements. Ashwagandha (Health Professional Fact Sheet). 2024. Open Source ↗
Key Highlights
- Adaptogenic root extract from Withania somnifera
- A staple of Ayurvedic tradition for energy and resilience
- Active compounds are withanolides, standardized in quality extracts
- Commonly taken to support a calm response to everyday stress
- Also used to support restful sleep, exercise recovery, and vitality
- Sold as capsules, powders (churna), and liquid extracts
2. Why People Reach for Ashwagandha
People most often consider ashwagandha when everyday life feels wound-up, sleep is restless, or daytime energy is flagging. These are common experiences with many possible causes — none of them point to ashwagandha specifically.
Ashwagandha is a general-wellness botanical, not a quick fix. People often reach for it when they notice several of the following and want gentle, daily support: NIH Office of Dietary Supplements. Ashwagandha (Health Professional Fact Sheet). 2024. Open Source ↗NIH Office of Dietary Supplements. Ashwagandha (Health Professional Fact Sheet). 2024. Open Source ↗
- Feeling frequently wound-up, tense, or “on edge”
- Trouble settling and winding down at the end of the day
- Restless or light sleep, or waking unrefreshed
- Lower daytime energy or a sense of being run-down
- Wanting support for exercise recovery and physical stamina
- A general wish to feel calmer, steadier, and more resilient
These experiences can have many different causes — they are not specific to ashwagandha, and no single supplement works in isolation. Ashwagandha alone is not a substitute for sleep, balanced nutrition, and movement. Always talk to your healthcare provider before assuming ashwagandha is the right choice for you.
3. Who Should Be Careful or Avoid
Some people should not take ashwagandha — most importantly during pregnancy and breastfeeding. If you take sedatives, have a thyroid or autoimmune issue, have liver concerns, or have surgery coming up, talk to your provider first.
Best to Avoid
- If you are pregnant: avoid. Beyond traditional caution and animal data, several European regulators have flagged a possible effect on reproductive and sex hormones and a possible abortion-inducing signal (an assessment industry disputes). NIH Office of Dietary Supplements. Ashwagandha (Health Professional Fact Sheet). 2024. Open Source ↗NIH Office of Dietary Supplements. Ashwagandha (Health Professional Fact Sheet). 2024. Open Source ↗
- If you are breastfeeding: there is no good data on whether it passes into breast milk, so avoidance is the cautious choice. Drugs and Lactation Database (LactMed). Ashwagandha. NIH. Open Source ↗
Talk to Your Healthcare Provider First If You:
- Have an overactive thyroid or take thyroid medication — ashwagandha may influence normal thyroid hormone production Sharma AK, Basu I, Singh S. J Altern Complement Med. 2018;24(3):243-248 (thyroid markers). Open Source ↗
- Have a highly sensitive or overactive immune system — ashwagandha naturally supports immune activity, which may not be suitable if your immune system requires strict medical management NIH Office of Dietary Supplements. Ashwagandha (Health Professional Fact Sheet). 2024. Open Source ↗
- Take sedatives, sleep aids, or other calming medicines — drowsiness can add up NIH Office of Dietary Supplements. Ashwagandha (Health Professional Fact Sheet). 2024. Open Source ↗
- Have any liver concern, or take medicines that can affect the liver LiverTox. Ashwagandha. NIDDK / NIH. 2024. Open Source ↗
- Have surgery scheduled — it is generally suggested to stop about 2 weeks beforehand NIH Office of Dietary Supplements. Ashwagandha (Health Professional Fact Sheet). 2024. Open Source ↗
- Take blood-sugar or blood-pressure medication — ashwagandha may influence these levels, so coordinate with your prescriber NIH Office of Dietary Supplements. Ashwagandha (Health Professional Fact Sheet). 2024. Open Source ↗
- Have a sensitive stomach — take it with food, and stop and check with your provider if it bothers your stomach NIH Office of Dietary Supplements. Ashwagandha (Health Professional Fact Sheet). 2024. Open Source ↗
- You avoid nightshades — ashwagandha is part of the nightshade plant family (the same family as tomatoes, potatoes, and peppers), so it may not suit a nightshade-free routine Mirjalili MH et al. Molecules. 2009;14(7):2373-2393. Open Source ↗
- You avoid dairy — some traditional and branded extracts (including certain KSM-66 products) are processed using cow’s milk, so a root extract is not automatically dairy-free NIH Office of Dietary Supplements. Ashwagandha (Health Professional Fact Sheet). 2024. Open Source ↗
4. How to Get the Best Results
Most people use a standardized root extract once or twice daily with food, and give it several weeks. Take it in the morning for daytime steadiness, or in the evening to help you wind down — whichever fits your goal.
Everyday Intake Ranges
Studies of general wellness most often use a standardized root extract in the range of roughly 250–600 mg per day; some concentrated, highly standardized extracts are used at lower amounts. Start at the lower end and adjust with your provider. Lopresti AL et al. Medicine (Baltimore). 2019;98(37):e17186 (Shoden stress and hormone RCT). Open Source ↗NIH Office of Dietary Supplements. Ashwagandha (Health Professional Fact Sheet). 2024. Open Source ↗
Best Time to Take
For daytime steadiness and a calm focus, take it in the morning. To help you unwind and support restful sleep, take it in the evening. Langade D et al. Cureus. 2019 (sleep RCT). Open Source ↗
With or Without Food
Taking ashwagandha with food can soften the mild stomach upset some people notice. NIH Office of Dietary Supplements. Ashwagandha (Health Professional Fact Sheet). 2024. Open Source ↗
Do I Need to Cycle It?
There is no firm rule requiring you to cycle ashwagandha. Many people take it daily for a stretch and then take a break; others use it only during busier seasons. Salve J et al. Phytother Res. 2025 (12-month safety, PMID 41063394). Open Source ↗
Give It Time
Ashwagandha is a slow-and-steady botanical. Most people who notice a difference do so after about 4 to 12 weeks of consistent daily use. Chandrasekhar K, Kapoor J, Anishetty S. Indian J Psychol Med. 2012;34(3):255-262. Open Source ↗Lopresti AL et al. Medicine (Baltimore). 2019;98(37):e17186 (Shoden stress and hormone RCT). Open Source ↗
5. Side Effects to Know About
Ashwagandha is generally well tolerated. The most common complaints are mild stomach upset and daytime drowsiness. Liver issues and vivid sleep events are rare, and some people report feeling emotionally “flat.”
Common (mild)
- Mild stomach upset, loose stools, or nausea — often eased by taking it with food
- Daytime drowsiness or grogginess, especially at higher amounts NIH Office of Dietary Supplements. Ashwagandha (Health Professional Fact Sheet). 2024. Open Source ↗
Uncommon
- Headache or a brief sense of heaviness
Rare — Stop and Seek Care
- Signs of a liver issue (yellowing skin or eyes, dark urine, marked tiredness) LiverTox. Ashwagandha. NIDDK / NIH. 2024. Open Source ↗Bokan G et al. Pharmaceuticals (Basel). 2023 (RUCAM liver-injury assessment). Open Source ↗
- Vivid dreams or other sleep events have been reported in isolated cases Ashwagandha sleep-related adverse-event case report. 2025. Open Source ↗
Worth Knowing
Some people who take ashwagandha for a long stretch report feeling emotionally “flat” or less responsive than usual. This is described from personal reports rather than controlled studies, and may relate to how the herb interacts with serotonin signaling. If you notice it, lowering the amount or pausing usually helps — and it is worth a conversation with your provider. Tripathi et al. Serotonergic receptor modulation study. 2012. Open Source ↗Majeed M et al. J Integr Complement Med. 2024. Open Source ↗
6. What Research Suggests
Research most consistently supports ashwagandha for a calmer response to everyday stress and for restful sleep, with growing support for exercise recovery. Evidence for focus, male vitality, and thyroid-hormone support is more mixed.
Most Supportive Evidence
A calmer response to everyday stress: randomized trials found that standardized root extract supported lower self-reported tension and steadier cortisol compared with placebo. Lopresti AL et al. Medicine (Baltimore). 2019;98(37):e17186 (Shoden stress and hormone RCT). Open Source ↗Chandrasekhar K, Kapoor J, Anishetty S. Indian J Psychol Med. 2012;34(3):255-262. Open Source ↗Salve J et al. Cureus. 2019;11(12):e6466 (adaptogenic and anxiolytic RCT). Open Source ↗
Restful sleep: trials suggest it can help people settle and wind down for more restful sleep. Langade D et al. Cureus. 2019 (sleep RCT). Open Source ↗
Exercise recovery and strength: in active adults, standardized extract supported muscle recovery and training gains alongside resistance exercise. Wankhede S et al. J Int Soc Sports Nutr. 2015;12:43 (muscle strength and recovery). Open Source ↗
Emerging or Mixed Evidence
Focus and mental clarity: some trials show modest support; results are not uniform. Acute and repeated ashwagandha supplementation and cognitive markers. Nutrients. 2024;16(12):1813. Open Source ↗
Male reproductive vitality and hormone balance: several trials are encouraging, but study quality varies. Lopresti AL et al. Medicine (Baltimore). 2019;98(37):e17186 (Shoden stress and hormone RCT). Open Source ↗
Thyroid-hormone markers: one trial saw a nudge toward steadier markers — a reason for caution if you have a thyroid issue, not a benefit to chase. Sharma AK, Basu I, Singh S. J Altern Complement Med. 2018;24(3):243-248 (thyroid markers). Open Source ↗
Not every study is positive, and many are small or industry-funded. Ashwagandha is best seen as gentle daily support, not a guarantee.
7. Forms & How It’s Sourced
Ashwagandha is not a food nutrient — it’s a root extract. Most quality products use a standardized root-only extract. India grows most of the world’s supply, and quality guidance favors standardized root-only material.
Because ashwagandha is a botanical rather than a dietary nutrient, you don’t get it from food — you take it as a prepared extract or powder. The common forms are:
- Standardized root-only extracts (for example, KSM-66) — the most-studied type, made from root only and standardized to a set withanolide percentage NIH Office of Dietary Supplements. Ashwagandha (Health Professional Fact Sheet). 2024. Open Source ↗
- Root-and-leaf extracts (for example, Sensoril, Shoden) — often higher in certain withanolides; note the sourcing point below Mirjalili MH et al. Molecules. 2009;14(7):2373-2393. Open Source ↗
- Whole-root powder (churna) — the traditional Ayurvedic preparation
- Liquid extracts / tinctures
Where It Comes From
India is the primary grower and exporter. Quality guidance emphasizes using the root only with clear plant-part labeling, so prefer products that specify root-only material. U.S. Pharmacopeia. Dietary Supplements Compendium (Withania somnifera root). Open Source ↗
A note on processing: some traditional and branded extracts (including certain KSM-66 products) are prepared using cow’s milk, so a root extract is not automatically dairy-free — check the label if you avoid dairy. NIH Office of Dietary Supplements. Ashwagandha (Health Professional Fact Sheet). 2024. Open Source ↗
| What you’ll see on the label | What it means | Good to know |
|---|---|---|
| KSM-66 | A popular root-only standardized extract | Root only; widely studied for everyday use Lopresti AL et al. Medicine (Baltimore). 2019;98(37):e17186 (Shoden stress and hormone RCT). Open Source ↗ |
| Sensoril | A root-and-leaf standardized extract | Higher withanolide content; includes leaf Mirjalili MH et al. Molecules. 2009;14(7):2373-2393. Open Source ↗ |
| Shoden | A high-glycoside root-and-leaf extract | Used at smaller amounts Langade D et al. Cureus. 2019 (sleep RCT). Open Source ↗ |
| “Standardized to X% withanolides” | The active-compound level is stated | A sign of a quality, testable product U.S. Pharmacopeia. Dietary Supplements Compendium (Withania somnifera root). Open Source ↗ |
| Whole-root powder | Ground root, not concentrated | Lower, more variable potency than an extract NIH Office of Dietary Supplements. Ashwagandha (Health Professional Fact Sheet). 2024. Open Source ↗ |
8. What Body Systems Does Ashwagandha Support?
Ashwagandha’s steadying effects touch several systems at once — most notably the body’s stress-response and sleep pathways, plus muscle recovery, hormonal balance, and antioxidant defenses.
🧠 Stress-Response & Mood
Helps steady the body’s stress-hormone pathway and supports a calm, balanced mood. Chandrasekhar K, Kapoor J, Anishetty S. Indian J Psychol Med. 2012;34(3):255-262. Open Source ↗Lopresti AL et al. Medicine (Baltimore). 2019;98(37):e17186 (Shoden stress and hormone RCT). Open Source ↗
😴 Sleep & Relaxation
Supports winding down at night for more restful sleep. Langade D et al. Cureus. 2019 (sleep RCT). Open Source ↗
💪 Muscle & Recovery
Supports muscle recovery and strength alongside training. Wankhede S et al. J Int Soc Sports Nutr. 2015;12:43 (muscle strength and recovery). Open Source ↗
⚖️ Hormonal Balance
Studied for support of reproductive vitality and hormone balance. Lopresti AL et al. Medicine (Baltimore). 2019;98(37):e17186 (Shoden stress and hormone RCT). Open Source ↗
🛡️ Antioxidant Defense
Withanolides support the body’s natural antioxidant pathways. Kaileh M et al. J Biol Chem. 2007;282(7):4253-4264. Open Source ↗
⚡ Energy & Vitality
Traditionally used as a tonic for everyday energy and resilience. Singh N et al. Afr J Tradit Complement Altern Med. 2008. Open Source ↗
9. Frequently Asked Questions
Is it safe to take ashwagandha every day?
For most healthy adults, daily use of a standardized root extract is well tolerated, and a 12-month observational study in healthy adults reported good tolerability (it was sponsored by an extract maker and did not include people with existing liver disease). It is not for everyone, though — see section 3. Salve J et al. Phytother Res. 2025 (12-month safety, PMID 41063394). Open Source ↗NIH Office of Dietary Supplements. Ashwagandha (Health Professional Fact Sheet). 2024. Open Source ↗
How long until I notice anything?
Ashwagandha works gradually. Most people who notice a change do so after about 4 to 12 weeks of consistent daily use. Chandrasekhar K, Kapoor J, Anishetty S. Indian J Psychol Med. 2012;34(3):255-262. Open Source ↗
Should I take it in the morning or at night?
Either works. Morning suits daytime steadiness; evening suits winding down for sleep. Langade D et al. Cureus. 2019 (sleep RCT). Open Source ↗
Do I need to cycle it?
There is no firm requirement to cycle. Many people take it daily for a while, then take a break. Salve J et al. Phytother Res. 2025 (12-month safety, PMID 41063394). Open Source ↗
Can ashwagandha make me feel emotionally flat?
Some long-term users report feeling less emotionally responsive. It is described from personal reports, not controlled studies; lowering the amount or pausing usually helps. Tripathi et al. Serotonergic receptor modulation study. 2012. Open Source ↗
Can it affect my blood tests?
Yes — it can interfere with certain heart-medication blood-level assays and may shift some hormone markers. Tell your provider you take it before testing. Dasgupta A et al. 2007 (digoxin immunoassay interference). Open Source ↗Ashwagandha IL-6 immunoassay interference study. 2022. Open Source ↗
Can I stop suddenly, or should I taper?
Most people stop without trouble. Because one report described discontinuation effects after long-term high use, easing off gradually is a sensible, cautious option. Ashwagandha discontinuation-effects case report. 2025. Open Source ↗
10. How to Choose a Quality Supplement — Bonus
Look for a standardized root extract from a named, third-party-tested brand, with the withanolide percentage and plant part clearly stated on the label. Root-only material is the safest default.
What to Look for on the Label
- A standardized root extract with the withanolide percentage stated (commonly 2.5%–10% for root-only extracts) U.S. Pharmacopeia. Dietary Supplements Compendium (Withania somnifera root). Open Source ↗
- The plant part clearly named — prefer root only U.S. Pharmacopeia. Dietary Supplements Compendium (Withania somnifera root). Open Source ↗
- A product that reports heavy-metal testing (lead, arsenic, cadmium) — because roots can take these up from soil, this is more protective than a generic “contaminant” statement U.S. Pharmacopeia. Dietary Supplements Compendium (Withania somnifera root). Open Source ↗
- A recognizable, well-characterized extract and an identified manufacturer Salve J et al. Phytother Res. 2025 (12-month safety, PMID 41063394). Open Source ↗
- Evidence of third-party testing for identity, potency, and contaminants U.S. Pharmacopeia. Dietary Supplements Compendium (Withania somnifera root). Open Source ↗
Quality Concerns to Be Aware Of
Ashwagandha has a documented history of adulteration and mislabeling — including leaf material sold as root. A standardized, tested, root-only product reduces that risk. U.S. Pharmacopeia. Dietary Supplements Compendium (Withania somnifera root). Open Source ↗
| Look for | Why it matters |
|---|---|
| Standardized root extract | Consistent, testable withanolide level U.S. Pharmacopeia. Dietary Supplements Compendium (Withania somnifera root). Open Source ↗ |
| Plant part stated (root-only) | Root-only is the safest default U.S. Pharmacopeia. Dietary Supplements Compendium (Withania somnifera root). Open Source ↗ |
| Named brand + third-party testing | Identity and purity you can verify U.S. Pharmacopeia. Dietary Supplements Compendium (Withania somnifera root). Open Source ↗ |
| Withanolide % on the label | Tells you the active-compound strength NIH Office of Dietary Supplements. Ashwagandha (Health Professional Fact Sheet). 2024. Open Source ↗ |
| Heavy-metal testing reported | Roots can take up lead, arsenic, and cadmium from soil U.S. Pharmacopeia. Dietary Supplements Compendium (Withania somnifera root). Open Source ↗ |
11. Your Genes & Ashwagandha — Bonus
People respond to ashwagandha differently, and some of that is individual biology. There is no validated genetic test to predict your response or your tolerance — start low and pay attention to how you feel.
How you process botanicals depends partly on the liver enzymes your genes build, which is one reason effects vary from person to person. Kim S-K et al. Heliyon. 2023;9(12):e22843 (ashwagandha extract pharmacokinetics). Open Source ↗
Researchers are studying whether certain immune-system gene variants make a small number of people more prone to liver reactions from botanical supplements in general. No ashwagandha-specific genetic test exists today, so the practical advice is simple: start at a low amount, and stop and check in with your provider if anything feels off. LiverTox. Ashwagandha. NIDDK / NIH. 2024. Open Source ↗
12. Traditional Roots — Bonus
Ashwagandha has been used in Ayurveda for thousands of years as a Rasayana — a rejuvenating tonic for strength and steadiness. Its name nods to the horse-like smell of the fresh root and to the vigor it was thought to confer.
In the Ayurvedic tradition, ashwagandha is one of the most prized Rasayana herbs, used to support stamina, steadiness, and healthy aging. Singh N et al. Afr J Tradit Complement Altern Med. 2008. Open Source ↗NIH Office of Dietary Supplements. Ashwagandha (Health Professional Fact Sheet). 2024. Open Source ↗
The Sanskrit name is often translated as “smell of the horse,” a nod both to the fresh root’s aroma and to the strength it was traditionally believed to impart. It also appears in the Unani and other South-Asian healing traditions. NIH Office of Dietary Supplements. Ashwagandha (Health Professional Fact Sheet). 2024. Open Source ↗
13. The Story Behind the Science — Bonus
Modern study of ashwagandha began in the 1960s with the isolation of withaferin A. Decades later, carefully standardized root extracts brought consistency to a traditional preparation — and research continues into how the plant makes its active compounds.
The first of ashwagandha’s signature compounds, withaferin A, was isolated in 1965, opening the door to modern laboratory study. Mirjalili MH et al. Molecules. 2009;14(7):2373-2393. Open Source ↗
From the 2000s onward, manufacturers developed carefully standardized root extracts so that each dose delivers a consistent amount of withanolides — turning a centuries-old preparation into a reproducible product. Today, researchers are even mapping how the plant builds its withanolides, pointing toward future production methods. NIH Office of Dietary Supplements. Ashwagandha (Health Professional Fact Sheet). 2024. Open Source ↗Kaileh M et al. J Biol Chem. 2007;282(7):4253-4264. Open Source ↗
14. How It Can Affect Blood Tests — Bonus
Ashwagandha can interfere with a few laboratory tests — most notably some blood-level assays for a common heart medication — and may shift certain hormone markers. Always tell your provider you take it before any testing.
There are two different things to know. First, a true analytical interference: ashwagandha’s withanolides resemble digoxin (a heart medication) closely enough to throw off some older blood-level assays, and one inflammatory-marker assay can read falsely low. Dasgupta A et al. 2007 (digoxin immunoassay interference). Open Source ↗Ashwagandha IL-6 immunoassay interference study. 2022. Open Source ↗
Second, real body changes that show up on tests: ashwagandha can nudge thyroid-hormone markers, testosterone, and cortisol. These are genuine shifts, not lab errors. Sharma AK, Basu I, Singh S. J Altern Complement Med. 2018;24(3):243-248 (thyroid markers). Open Source ↗Lopresti AL et al. Medicine (Baltimore). 2019;98(37):e17186 (Shoden stress and hormone RCT). Open Source ↗
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.