Buy Ashwagandha

Products that match the form and dose used in the studies. Umbral earns a commission on qualifying purchases; the ranking never changes with the commission.

Strong

600 mg/day (or 300 mg ×2)

Ratings, prices and photos were read from Amazon on Sep 18, 2026. Amazon prices change; the current one is on the product page.

Nutricost KSM-66 Ashwagandha Root Extract 600 mg, 60 capsules

4.6(4,245)

$14.95

Root-only extract standardized to 5% withanolides — the form used in the sleep and cortisol trials.

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Amazon price on Sep 18, 2026.

THORNE Ashwagandha, Highly Concentrated Shoden Extract

4.6(652)

$22.00

Shoden is standardised to 35% withanolides, so 120–240 mg replaces 600 mg of KSM-66. Fewer capsules for the same withanolide load, and third-party tested.

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Amazon price on Sep 18, 2026.

FGO Organic Ashwagandha Root Powder, 16 oz

4.5(7,072)

$21.99

Raw root powder for smoothies — 3–6 g approximates 600 mg of extract. Seven thousand ratings, the best-reviewed powder here.

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Amazon price on Sep 18, 2026.

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What to look for

✓KSM-66 or Shoden branded root extract
✓600 mg/day dose (2 × 300 mg or 1 × 600 mg)
✓Third-party tested (USP, NSF, Informed Sport)

What to avoid

✕Leaf-based extracts or 'proprietary blends' without mg
✕Products bundled with melatonin if you want to isolate the effect

Safety flags

· Rare liver-injury case reports (NIH LiverTox) — stop on dark urine/jaundice.
· Raises thyroid hormones — avoid with hyperthyroidism or levothyroxine.
· Avoid in pregnancy and autoimmune disease.

See the evidence Record what I'm taking

As an Amazon Associate, Umbral earns from qualifying purchases. Product data is provided by Amazon and may change; ratings and prices shown are Amazon's, not Umbral's. Recommendations are based on the evidence grade and the form used in trials, never on commission.

Umbral is a wellness product, not a medical device. It does not diagnose, treat, cure or prevent any disease. Supplement information is educational; talk to a clinician before starting anything, especially if you are pregnant, under 18, managing a condition or taking medication.