Best 6 Ashwagandha Supplements (2026): KSM-66, Shoden & Whole Root Compared

At a Glance

• Best Overall Thorne Ashwagandha – 120 mg of Shoden extract, the exact daily dose used in a sleep trial, NSF Contents Certified.Review ↓
• Best Value Nutricost KSM-66 Ashwagandha – 600 mg of KSM-66 in one capsule, the dose used in stress trials, at the lowest cost per serving on our list.Review ↓
• Best Clean-Label KSM-66 Pure Encapsulations Ashwagandha – 500 mg of KSM-66 with only cellulose added.Review ↓
• Best Clinically Tested Product Gaia Herbs Ashwagandha Root – the same product used in a 30-day stress trial in students.Review ↓
• Best Higher-Dose KSM-66 Physician’s Choice KSM-66 Ashwagandha – 1,000 mg of organic KSM-66 per 2 capsules.Review ↓
• Best Whole-Root Organic Himalaya Organic Ashwagandha – USDA Organic root powder and extract in one caplet a day.Review ↓

The Short Answer: The best ashwagandha supplement is a standardized extract at the dose used in trials: about 600 mg a day of a root extract such as KSM-66, or 120 mg a day of the more concentrated Shoden extract¹². Thorne Ashwagandha is our top pick: 120 mg of Shoden in one capsule, NSF Contents Certified and with a short ingredient list.

On this page

1. Do You Actually Need an Ashwagandha Supplement?
2. Find Your Match
3. KSM-66 vs. Shoden vs. Whole Root
4. Ashwagandha Supplements Compared
5. The 6 Best Ashwagandha Supplements, Reviewed
6. Products We Didn’t Recommend
7. Evidence Scorecard
8. How to Take Ashwagandha for Best Results
9. What to Expect and When
10. Safety, Side Effects & Drug Interactions
11. How to Choose an Ashwagandha Supplement
12. Frequently Asked Questions
13. Final Verdict

Choose KSM-66 if you want the most-studied root extract, and Shoden if sleep is your main goal. Use it for up to about 3 months at a time, since longer-term safety hasn’t been studied¹.

We compared 16 ashwagandha labels on extract type, dose against trials, withanolide content, testing, other ingredients and value, and checked sellers and listing details. Every product is ranked by its BFN Score, a relative score within this guide. See our review process for how we score.

Do You Actually Need an Ashwagandha Supplement?

Most people don’t. Ashwagandha is not a nutrient, so there is no deficiency to correct. It may help if stress, anxiety or poor sleep are affecting your daily life and you want to try an herbal option alongside sleep, exercise and other proven habits.

In a review of 7 trials with 491 adults, extracts lowered perceived stress and anxiety over 6 to 8 weeks, with larger benefits at 500 to 600 mg a day¹. A meta-analysis of 5 trials found a small but significant improvement in sleep, stronger at 600 mg a day or more and after at least 8 weeks².

Who Should Skip It

• People who are pregnant, breastfeeding or trying to conceive¹.
• People with thyroid conditions or who take thyroid medicine: ashwagandha can raise thyroid hormone levels¹.
• People with liver disease or a history of liver problems³.
• Men with hormone-sensitive prostate cancer¹.
• People taking sedatives, immunosuppressants, or medicines for diabetes or blood pressure, unless their doctor approves¹.

Nutritionist tip: Denmark banned ashwagandha in 2023 after a safety review¹, so if you live outside the U.S., check your country’s rules.

Find Your Match

If you…	Consider	Why
Want a well-tested, low-dose option	Thorne Ashwagandha	NSF Contents Certified, 120 mg Shoden
Mainly want better sleep	Thorne Ashwagandha	Matches the Shoden sleep-trial dose1
Want the trial dose for stress at low cost	Nutricost KSM-66 Ashwagandha	600 mg in one capsule
Want KSM-66 with no other actives	Pure Encapsulations Ashwagandha	Only cellulose added
Want a product that was itself tested	Gaia Herbs Ashwagandha Root	Used in a 30-day trial1
Want a higher KSM-66 dose	Physician’s Choice KSM-66	1,000 mg per serving
Prefer certified organic whole root	Himalaya Organic Ashwagandha	USDA Organic, 1 caplet
Prefer a chewable	Our ashwagandha gummies guide	Compared gummy formulas

KSM-66 vs. Shoden vs. Whole Root

Type	Plant part	Typical trial dose	Studied for	Our pick
KSM-66	Root	600 mg a day	Stress, anxiety, sleep1	Nutricost, Pure Encapsulations
Shoden	Root and leaf	120 mg a day	Sleep, stress1	Thorne
Gaia Herbs root blend	Root	350 mg twice a day	Stress1	Gaia Herbs
Whole-root powder	Root	Not well studied at label doses	Traditional use	Himalaya

Withanolides are the compounds most often used to standardize ashwagandha. Higher percentages don’t automatically mean better results. See our KSM-66 vs. Sensoril vs. regular ashwagandha and what are withanolides guides.

Ashwagandha Supplements Compared

Scroll sideways to see every column →

#	Product	Extract	Dose per Serving	Withanolides	Servings	Daily Pills	Purity Testing	Additives	Diet	Cost
1	Thorne Ashwagandha	Shoden (root, leaf)	120 mg	35% glycosides (about 42 mg)	30	1 capsule	NSF Contents Certified	Clean	Vegetarian capsule	$$$
2	Nutricost KSM-66	KSM-66 (root)	600 mg	Min. 5% (30 mg)	60	1 capsule	Not stated	Note	Gluten-free	$$$
3	Pure Encapsulations	KSM-66 (root)	500 mg	Not stated on listing	60	1 capsule	Not stated	Clean	Vegetarian capsule	$$$
4	Gaia Herbs	Root and root extract	700 mg (2 capsules)	5 mg	30	2 capsules	Not stated	Clean	Vegan	$$$
5	Physician’s Choice	KSM-66 (root)	1,000 mg (2 capsules)	5% (about 50 mg)	30	2 capsules	Not stated	Note	Vegan	$$$
6	Himalaya Organic	Root powder and extracts	670 mg	About 3 mg	120	1 caplet	Not stated	Clean	USDA Organic	$$$

Cost tiers per daily serving: $ under $0.30 · $$ $0.30–$0.70 · $$$ over $0.70 (checked November 2026). Ashwagandha has no Daily Value or established upper limit.

The 6 Best Ashwagandha Supplements, Reviewed

#1Best Overall

1. Thorne Ashwagandha

BFN Score9.6/10

$$$Premium30 servings1 capsule per serving

Strongest atDose accuracyWeakest atValue & practicality

Thorne uses 120 mg of Shoden, a root-and-leaf extract standardized to 35% withanolide glycosides, in one capsule a day. The bottle carries the NSF Contents Certified mark.

Check price on Amazon →

Label Reality Check

Active ingredient + form

Shoden ashwagandha extract (root, leaf)

Dose per serving

120 mg (1 capsule); about 42 mg withanolide glycosides

Dose vs. research

Matches the 120 mg daily dose in a 6-week sleep trial¹

% DV / Upper Limit

No DV or UL

Purity testing

NSF Contents Certified

Other ingredients

microcrystalline cellulose, hypromellose capsule, ascorbyl palmitate

Additives

Clean

Allergens & diet

vegetarian capsule

Safety flags

Pregnancy and trying to conceive; thyroid conditions; liver disease; sedatives

Clinical Relevance

In a 6-week trial of 150 adults, 120 mg a day of Shoden improved sleep quality in 72% of users versus 29% on placebo¹. Shoden has also been studied for stress, though in fewer trials than KSM-66.

Strengths

• Trial-matched dose in one capsule
• Independent NSF certification
• Short ingredient list

Limitations

• Highest cost per serving tier
• Only 30 capsules per bottle
• Fewer trials than KSM-66

Practical Details

Take one capsule a day. Many people take it in the evening if sleep is the goal.

Best For / Not For

Best foradults who want a tested, low-dose extract, especially for sleep.

Not forbudget buyers or anyone pregnant or trying to conceive.

Buyer Experience

Buyers say it helps lower stress and anxiety and improves their sleep. Many trust the brand’s quality.

Side effects are mentioned by some buyers.

vs. Nutricost KSM-66 Ashwagandha

Choose Thorne for a sleep-focused extract with NSF certification and no black pepper extract. Choose Nutricost for the 600 mg KSM-66 trial dose at a much lower cost.

Nutritionist’s Note

The label says not to use it if you are pregnant, nursing or trying to conceive.

Verdict: The best-tested ashwagandha on our list, at the exact dose used in a sleep trial.

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#2Best Value

2. Nutricost KSM-66 Ashwagandha

BFN Score9.2/10

$$$Budget60 servings1 capsule per serving

Strongest atValue & practicalityWeakest atQuality & trust

Nutricost provides 600 mg of organic KSM-66 root extract, standardized to at least 5% withanolides, in a single capsule. It costs the least per serving on our list.

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Label Reality Check

Active ingredient + form

organic KSM-66 ashwagandha root extract

Dose per serving

600 mg (1 capsule); min. 30 mg withanolides

Dose vs. research

Matches the 600 mg daily dose used in KSM-66 trials¹²

% DV / Upper Limit

No DV or UL

Purity testing

Not stated (brand says third-party tested, lab not named)

Other ingredients

hypromellose capsule, organic flow agent blend, silica, magnesium stearate; 5 mg BioPerine black pepper extract on the Supplement Facts image

Additives

Note (black pepper extract)

Allergens & diet

gluten-free, non-GMO

Safety flags

Pregnancy and breastfeeding; thyroid conditions; liver disease; medicines affected by piperine

Clinical Relevance

600 mg a day of KSM-66 is the dose used in most stress and sleep trials of this extract¹². The small amount of black pepper extract isn’t needed for it to work.

Strengths

• Trial dose in one capsule
• Lowest cost per serving
• Withanolide content stated

Limitations

• Contains black pepper extract
• No independent certifier named
• Listing text and label image differ

Practical Details

Take one capsule a day with 8 to 12 oz of water. Check the bottle you receive, since the listing text and label image don’t match.

Best For / Not For

Best forbudget buyers who want the trial dose of KSM-66.

Not forpeople who want to avoid black pepper extract.

Buyer Experience

Buyers say it helps with stress and sleep, is easy to swallow and has no aftertaste. Many see it as good value.

Repeated complaints are few in buyer feedback.

vs. Pure Encapsulations Ashwagandha

Choose Nutricost for the full 600 mg at a lower cost. Choose Pure Encapsulations for a capsule with nothing but KSM-66 and cellulose.

Nutritionist’s Note

If you take medicines with a narrow dosing range, ask your pharmacist about piperine before choosing a product that contains it.

Verdict: The trial dose of KSM-66 at the lowest cost per serving.

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#3Best Clean-Label KSM-66

3. Pure Encapsulations Ashwagandha

BFN Score9.2/10

$$$Mid-range60 servings1 capsule per serving

Strongest atPurity & additivesWeakest atQuality & trust

Pure Encapsulations puts 500 mg of KSM-66 root extract in each capsule, with only cellulose added. There is no black pepper or other active ingredient.

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Label Reality Check

Active ingredient + form

KSM-66 ashwagandha root extract

Dose per serving

500 mg (1 capsule)

Dose vs. research

Within the 500–600 mg range linked to larger stress benefits¹

% DV / Upper Limit

No DV or UL

Purity testing

Not stated

Other ingredients

cellulose, vegetarian capsule (cellulose, water)

Additives

Clean

Allergens & diet

vegetarian capsule

Safety flags

Pregnancy and breastfeeding; thyroid conditions; liver disease; sedatives

Clinical Relevance

KSM-66 is the most studied ashwagandha root extract, and 500 to 600 mg a day is where stress trials saw the clearest benefit¹.

Strengths

• No added actives
• Trial-range KSM-66 dose
• One capsule a day

Limitations

• No independent certifier named
• Withanolide content not stated on the listing
• Slightly below the 600 mg dose

Practical Details

Take one capsule a day, with or between meals.

Best For / Not For

Best forpeople who want plain KSM-66 with nothing else added.

Not forpeople who want third-party certification.

Buyer Experience

Buyers say it helps with sleep and stress and praise its clean ingredients and trusted brand.

Repeated complaints are few in buyer feedback.

vs. Physician’s Choice KSM-66 Ashwagandha

Choose Pure Encapsulations for a trial-range dose in one capsule with no black pepper extract. Choose Physician’s Choice for a higher dose of organic KSM-66 with stated withanolides.

Nutritionist’s Note

If you take thyroid medicine, ask your doctor to recheck your levels if you start ashwagandha¹.

Verdict: The cleanest KSM-66 on our list, at a trial-range dose.

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#4Best Clinically Tested Product

4. Gaia Herbs Ashwagandha Root

BFN Score9.1/10

$$$Premium30 servings2 capsules per serving

Strongest atEvidence fitWeakest atValue & practicality

Gaia Herbs blends organic ashwagandha root with a root extract in a liquid-filled vegan capsule: 350 mg and 2.5 mg of withanolides each. This product, at 1 capsule twice a day, was used in a 30-day trial in students¹.

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Label Reality Check

Active ingredient + form

organic ashwagandha root and root extract blend

Dose per serving

700 mg (2 capsules); 5 mg withanolides

Dose vs. research

Matches the dose used in its own 30-day trial¹

% DV / Upper Limit

No DV or UL

Purity testing

Not stated

Other ingredients

vegetable glycerin, water, vegan capsule (hypromellose)

Additives

Clean

Allergens & diet

vegan, gluten-free, dairy-free, soy-free

Safety flags

Pregnancy and breastfeeding; thyroid conditions; liver disease; sedatives

Clinical Relevance

Few supplements have been tested as the finished product. In a 30-day trial of 60 students, this capsule taken twice a day improved overall stress scores¹.

Strengths

• Finished product was trial-tested
• Organic root, vegan capsule
• No fillers

Limitations

• Low withanolide content
• 2 capsules a day
• Higher cost per serving

Practical Details

Take one capsule twice a day. The label notes that benefits build over time.

Best For / Not For

Best forpeople who want a whole-root product with its own trial.

Not forpeople who want a high-potency extract.

Buyer Experience

Buyers say it helps with stress, sleep and mood, and they trust the brand. Many find the capsules easy to swallow.

Repeated complaints are few in buyer feedback.

vs. Himalaya Organic Ashwagandha

Choose Gaia Herbs for a product backed by its own trial. Choose Himalaya for one caplet a day at a lower cost.

Nutritionist’s Note

The trial ran only 30 days in healthy students, so results may differ for older adults or people with anxiety disorders.

Verdict: A gentle organic root product with its own trial behind it.

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#5Best Higher-Dose KSM-66

5. Physician’s Choice KSM-66 Ashwagandha

BFN Score8.2/10

$$$Premium30 servings2 capsules per serving

Strongest atEvidence fitWeakest atDose accuracy

Physician’s Choice provides 1,000 mg of organic KSM-66, standardized to 5% withanolides, plus 15 mg of organic black pepper extract per 2 capsules.

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Label Reality Check

Active ingredient + form

organic KSM-66 ashwagandha root extract

Dose per serving

1,000 mg (2 capsules); about 50 mg withanolides

Dose vs. research

Above the 600 mg dose used in most KSM-66 trials¹

% DV / Upper Limit

No DV or UL

Purity testing

Not stated (brand says third-party tested, lab not named)

Other ingredients

vegetable cellulose capsule, 15 mg organic black pepper extract

Additives

Note (black pepper extract)

Allergens & diet

vegan

Safety flags

Pregnancy and breastfeeding; thyroid conditions; liver disease; medicines affected by piperine

Clinical Relevance

KSM-66 is well studied, but 1,000 mg a day is above the dose most trials used. Liver injury reports have involved doses from 450 to 1,350 mg a day¹.

Strengths

• Organic KSM-66
• Withanolide content stated
• Flexible: 1 capsule gives 500 mg

Limitations

• Full serving above trial dose
• Contains black pepper extract
• Highest cost per serving

Practical Details

The label directs 2 capsules once a day. One capsule (500 mg) keeps you in the trial range.

Best For / Not For

Best forpeople who want a higher-strength KSM-66 and can split the dose.

Not forpeople taking medicines affected by piperine.

Buyer Experience

Buyers say it reduces stress, improves sleep quality and helps their mental clarity and focus.

Repeated complaints are few in buyer feedback.

vs. Nutricost KSM-66 Ashwagandha

Choose Physician’s Choice for a higher dose of organic KSM-66. Choose Nutricost for the trial dose in one capsule at a lower cost.

Nutritionist’s Note

More isn’t better with ashwagandha; start with one capsule and stop if you notice dark urine, yellow skin or unusual tiredness.

Verdict: A strong organic KSM-66 that most people should take at half the label dose.

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#6Best Whole-Root Organic

6. Himalaya Organic Ashwagandha

BFN Score8.2/10

$$$Mid-range120 servings1 caplet per serving

Strongest atPurity & additivesWeakest atEvidence fit

Himalaya combines 380 mg of organic root powder, 280 mg of organic root extract and 10 mg of a CO2 extract in one caplet. Together they supply about 3 mg of withanolides.

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Label Reality Check

Active ingredient + form

organic ashwagandha root powder, root extract and CO2 extract

Dose per serving

670 mg (1 caplet); about 3 mg withanolides

Dose vs. research

Well below the withanolide content of trial extracts¹

% DV / Upper Limit

No DV or UL

Purity testing

Not stated

Other ingredients

none listed

Additives

Clean

Allergens & diet

USDA Organic

Safety flags

Pregnancy and breastfeeding; thyroid conditions; liver disease; sedatives

Clinical Relevance

Whole-root powder is the traditional form, but most trials used concentrated extracts. This caplet supplies much less of the standardized compounds than KSM-66 or Shoden.

Strengths

• USDA Organic
• No additives listed
• One caplet a day

Limitations

• Low withanolide content
• Not matched to a trial dose
• No independent certifier named

Practical Details

Take one caplet a day before food, as the label directs.

Best For / Not For

Best forpeople who prefer certified organic whole root.

Not forpeople who want a trial-matched extract.

Buyer Experience

Buyers say it helps with stress and anxiety and that they wake up with more energy.

Repeated complaints are few in buyer feedback.

vs. Gaia Herbs Ashwagandha Root

Choose Himalaya for one caplet a day at a lower cost. Choose Gaia Herbs for a whole-root product that was tested in a trial.

Nutritionist’s Note

Whole-root products are milder. If you notice no change after 8 weeks, a standardized extract may be a better fit.

Verdict: A clean, certified organic whole-root option.

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Products We Didn’t Recommend

Transparent Labs KSM-66 and Legion KSM-66. Both use 600 mg of KSM-66, but each listing had very few buyer reviews when we checked.

Double Wood Ashwagandha 20:1. The label lists a 20:1 extract but doesn’t state withanolide content.

Natural Factors KSM-66. At the label’s 2 capsules a day, a 30-capsule bottle lasts only 15 days.

XYMOGEN Ashwagandha 35. Uses the same Shoden extract as our top pick, with few buyer reviews.

PrimaForce KSM-66. Adds BioPerine and had very few buyer reviews.

Evidence Scorecard

Ingredient / Form	What it’s studied for	Evidence level	Notes
Ashwagandha extracts, 240–1,250 mg a day	Stress, anxiety	Moderate	7 trials, 491 adults, 6–8 weeks; larger benefit at 500–600 mg1
Ashwagandha extracts	Sleep	Moderate	5 trials: small benefit, larger at 600 mg+ and 8 weeks+2
Shoden, 120 mg a day	Sleep quality	Limited	One 6-week trial in 150 adults1
Gaia Herbs root, 350 mg twice a day	Stress	Limited	One 30-day trial in 60 students1
Long-term use (over 3 months)	Safety	Unknown	Not studied1

Ashwagandha supplements are not treatments for anxiety disorders or insomnia and should not replace care from your doctor.

How to Take Ashwagandha for Best Results

Extract	Dose used in trials	How long
KSM-66 root extract	600 mg a day	8 weeks12
Shoden root and leaf extract	120 mg a day	6 weeks1
Gaia Herbs root blend	700 mg a day (2 × 350 mg)	30 days1

Ashwagandha has no RDA or established upper limit.

• Match the dose to the extract, not to the biggest number on the label.
• Give it 6 to 8 weeks, the length of most trials¹.
• Take a break after about 3 months: longer-term safety isn’t known¹.
• Take it with food if it upsets your stomach.

For more detail, see our guides to the best time to take ashwagandha, ashwagandha for sleep, ashwagandha for anxiety and KSM-66 ashwagandha supplements.

What to Expect and When

Most trials measured changes after 6 to 8 weeks of daily use¹. Sleep benefits were larger after at least 8 weeks².

If you notice no change after 8 weeks, ashwagandha may not be right for you. Talk to your doctor if stress, anxiety or sleep problems continue.

Safety, Side Effects & Drug Interactions

Ashwagandha is usually well tolerated for up to about 3 months. The most common side effects are stomach upset, loose stools, nausea and drowsiness¹. Rare cases of liver injury have been reported, most improving after people stopped taking it¹³.

Medication or condition	Possible interaction	What to do
Thyroid medicine or thyroid conditions	Can raise thyroid hormone levels1	Avoid unless your doctor approves
Sedatives and sleep medicines	Added drowsiness1	Ask your doctor first
Diabetes medicines	May add to blood sugar lowering1	Monitor blood sugar
Blood pressure medicines	May add to blood pressure lowering1	Monitor readings
Immunosuppressants	Possible interaction1	Avoid unless your doctor approves
Liver disease or liver symptoms	Rare liver injury reports3	Stop and see a doctor if you notice dark urine or yellow skin
Pregnancy and breastfeeding	Safety not established1	Avoid

How to Choose an Ashwagandha Supplement

Form and Absorption

Pick a named, standardized extract such as KSM-66 or Shoden, since these are what trials tested. Whole-root powders are milder and less studied.

Dose and % DV

Match the dose to the extract: about 600 mg for KSM-66 or 120 mg for Shoden. Ashwagandha has no Daily Value.

Purity Testing

Look for NSF, USP or another named certifier. Herbal products can vary, and “third-party tested” without a lab name tells you little.

Additives and Allergens

Most capsules use only cellulose or a flow agent. Check for black pepper extract if you take medicines that interact with it.

Pill Burden and Format

One capsule a day is easiest. For gummies, see our ashwagandha gummies guide.

Cost per Effective Dose

Compare cost per trial-matched daily dose, not per bottle.

Important: These supplements are not intended to diagnose, treat, cure, or prevent any disease. Results vary by individual. If you have a health condition or take medications, check with your doctor before adding any new supplement to your routine.

Frequently Asked Questions

Final Verdict

Thorne Ashwagandha is the best ashwagandha supplement for most people: 120 mg of Shoden, the dose used in a sleep trial, with NSF Contents Certified status.

For the trial dose at the lowest cost, choose Nutricost KSM-66 Ashwagandha. For plain KSM-66 with nothing else added, choose Pure Encapsulations Ashwagandha.

Use ashwagandha for up to about 3 months at a time, and skip it if you are pregnant or have thyroid or liver problems.

Sources & History3 sources · updated November 3, 2026

References

1. Ashwagandha: Is It Helpful for Stress, Anxiety, or Sleep? Fact Sheet for Health Professionals — NIH Office of Dietary Supplements
2. Effect of Ashwagandha (Withania somnifera) Extract on Sleep: A Systematic Review and Meta-Analysis — PLOS One, 2021
3. Ashwagandha — LiverTox: Clinical and Research Information on Drug-Induced Liver Injury, NIH

Update history

• November 3, 2026Rebuilt with BFN Score v3: compared 16 ashwagandha labels and ranked six products by extract type, dose against trials, withanolide content, testing, other ingredients and value; added a KSM-66 vs. Shoden vs. whole-root table, stress and sleep evidence, liver and thyroid safety notes and a drug-interaction table.