Best Ashwagandha Supplements, Scored on a Public Rubric
Ashwagandha (Withania somnifera) is the most-studied adaptogen in published literature, with meta-analyses supporting modest effects on self-reported stress and sleep quality. What matters on the label is the specific extract — KSM-66 and Sensoril are the two most-researched standardized extracts, each with their own clinical trial profile. A raw-powder supplement is not equivalent. Below are five we scored.
Top pick
Nutricost — Ashwagandha KSM-66
600mg KSM-66 per capsule, 5% withanolides, 120-count
NOW Foods — Ashwagandha KSM-66
At a glance
Tap a column to sort| # | Best for | Price | ||
|---|---|---|---|---|
| 1 | | Best KSM-66 at low per-serving cost | 8.2/10 | $14.95 |
| 2 | | Best mainstream brand KSM-66 | 8.2/10 | $25.50 |
| 3 |  | Best whole-root for traditional formulation | 6.8/10 | $21.99 |
| 4 |  | Sensoril extract option | 7.8/10 | $22.99 |
| 5 | Sundaily — Organic Ashwagandha | Clean-label KSM-66 with minimal extras | 7.5/10 | Check price |
Prices pulled from Amazon as of Jul 6, 2026 and are subject to change. The price shown on Amazon at checkout applies.
How we scored
Every product below is scored on six metrics, 0-10 each, with the weighting described on how we review. The criteria specific to this category:
- Standardized extract (KSM-66 or Sensoril) with disclosed withanolide percentage.
- Full-spectrum root (KSM-66) vs root + leaf (Sensoril) — different research profiles.
- Third-party testing for heavy metals (ashwagandha is grown in soils prone to contamination).
- Dose per serving (KSM-66 research at 300-600mg/day; Sensoril at 125-250mg).
- Clean capsule/tablet label — no unnecessary filler blends.
- Cost per clinically-relevant daily dose.
What to know before buying
- Stick to standardized extracts, not generic 'ashwagandha root powder'. Clinical trials use specific extract ratios.
- KSM-66 (root only, 5% withanolides) and Sensoril (root + leaf, 10% withanolides) are two different products with different research profiles. Neither is objectively better — they were tested at different doses for different endpoints.
- Pregnant or breastfeeding? Ashwagandha is not recommended — discuss with a doctor.
Our picks
Nutricost — Ashwagandha KSM-66
Key specs: 600mg KSM-66 per capsule, 5% withanolides, 120-count
$14.95Check price on AmazonPros
- Genuine KSM-66 extract (not generic)
- Low cost per clinically-relevant dose
- Informed Sport on selected batches
Cons
- Not all batches are batch-certified for sport testing
- Capsule size is moderately large
Nutricost — Ashwagandha KSM-66
- Third-party testing7/10
- Bioavailability8/10
- Clinical evidence9/10
- Value10/10
- Brand transparency7/10
- Form & absorption8/10
NOW Foods — Ashwagandha KSM-66
Key specs: 450mg KSM-66, 5% withanolides, 90 veg capsules
$25.50Check price on AmazonPros
- NOW's in-house ISO-certified lab testing
- Published COA available
- Competitive price per capsule
Cons
- Smaller per-capsule dose than premium options — need 2 for 600mg
NOW Foods — Ashwagandha KSM-66
- Third-party testing8/10
- Bioavailability8/10
- Clinical evidence9/10
- Value8/10
- Brand transparency8/10
- Form & absorption8/10
Himalaya — Himalaya Organic Ashwagandha
Key specs: 670mg full-spectrum ashwagandha root per 2-tablet dose, USDA Organic
$21.99Check price on AmazonPros
- USDA Organic whole-root (not an extract)
- Himalaya has decades of herbal supplement history and traditional formulation expertise
- Third-party tested for heavy metals
Cons
- Not a standardized extract — withanolide content per serving not guaranteed
- Clinical trial evidence is on extracts, not whole root
Himalaya — Himalaya Organic Ashwagandha
- Third-party testing7/10
- Bioavailability6/10
- Clinical evidence6/10
- Value8/10
- Brand transparency7/10
- Form & absorption7/10
Life Extension — Life Extension Optimized Ashwagandha
Key specs: 125mg Sensoril ashwagandha per capsule, 10% withanolides, 60-count
$22.99Check price on AmazonPros
- Sensoril is the root+leaf extract with distinct published research
- 10% withanolides — higher concentration per mg
- Life Extension publishes batch COAs
Cons
- Sensoril research base is smaller than KSM-66
- Leaf component — if you prefer root-only, choose KSM-66
Life Extension — Life Extension Optimized Ashwagandha
- Third-party testing8/10
- Bioavailability8/10
- Clinical evidence8/10
- Value7/10
- Brand transparency8/10
- Form & absorption8/10
Sundaily — Organic Ashwagandha
Key specs: 600mg KSM-66, 5% withanolides, 60 capsules, vegan
Check price on AmazonPros
- Single-ingredient label
- KSM-66 at the clinically-studied dose
Cons
- Smaller brand, less public third-party testing documentation
- Premium price per capsule
Sundaily — Organic Ashwagandha
- Third-party testing6/10
- Bioavailability8/10
- Clinical evidence9/10
- Value7/10
- Brand transparency7/10
- Form & absorption8/10
Frequently asked questions
Most randomized controlled trials measure outcomes at 8-12 weeks of daily use. Expect at least 4-8 weeks of consistent use before you can fairly evaluate effects on subjective stress or sleep.
Related reading
Sources
- Efficacy and Safety of Ashwagandha (Withania somnifera) Root Extract in Improving Memory — Journal of Dietary Supplements, 2017
- An investigation into the stress-relieving and pharmacological actions of an ashwagandha (Withania somnifera) extract — Medicine (Baltimore), 2019
- Ashwagandha in the treatment of subclinical hypothyroidism — Journal of Alternative and Complementary Medicine, 2018
Last verified: April 21, 2026. See our editorial policy and how we review for details on scoring and update cadence. Canonical URL: https://trustedhealthgear.com/reviews/best-ashwagandha.
Nutricost — Ashwagandha KSM-66
$14.95 · on Amazon