Ashwagandha KSM-66 600mg (Standardized Root Extract)
A standardized KSM-66 ashwagandha root extract at the 600 mg/day dose used in several stress and anxiety trials. Marketed for stress resilience, not as a treatment for any anxiety disorder.
Resar evidence panel
0–100 · cited research only
Evidence Score
81
Strong
Safety Score
74
Strong
Effectiveness Score
78
Strong
Research Confidence
75
Strong
Product Fit Score
76
Strong
Bottom line
Strong evidence (Strong) for mental health — worth a closer look if this fits your goals.
Individual results vary. Summaries are educational — not medical advice.
Evidence Score
81
Strong
Price
$19.95
Resar may earn an affiliate commission on this purchase. Commissions never change scores — see our affiliate disclosure and conflicts policy. Scores reflect cited research, not medical advice.
Compare others in Mental HealthTop research
The strongest studies behind this product
Ranked by evidence hierarchy and how closely each study matches this product. Start with the strongest study, then read down. Every claim needs a trail.
Adaptogenic and Anxiolytic Effects of Ashwagandha Root Extract in Healthy Adults: A Double-blind, Randomized, Placebo-controlled Clinical Study
Randomized Controlled Trial · Cureus · 2019 · n=58
What the research shows
Significant reductions in perceived stress and cortisol at the 600 mg dose.
An investigation into the stress-relieving and pharmacological actions of an ashwagandha (Withania somnifera) extract: A randomized, double-blind, placebo-controlled study
Randomized Controlled Trial · Medicine (Baltimore) · 2019 · n=60
An alternative treatment for anxiety: a systematic review of human trial results reported for the Ayurvedic herb ashwagandha
Systematic Review · Journal of Alternative and Complementary Medicine · 2014
Scores reflect these cited studies, not medical advice. Expand the full evidence detail below for protocols, dose context, and reported side effects.
Claim ledger
Every claim, mapped to its source
Each product claim below is tied to a specific paper with study type, match strength, and limitations. Nothing here is medical advice — it is a research trail you can audit.
Claim match reflects how closely a specific paper supports this benefit — not AI confidence or medical certainty.
Full evidence detail
Study-by-study breakdown
Each paper below is ranked for this listing. Start with the highest match, then expand any study for a plain-language readout.
How to read this section
- Match % - how closely the study matches this product (not overall scientific quality).
- Evidence type - study design (RCT, review, etc.) and whether it is direct, category-level, or indirect.
- What it found - short summary and quoted extract from the paper metadata. Not medical advice.
In plain language
What the study reported
Verified extract — not AI generated
“Significant reductions in perceived stress and cortisol at the 600 mg dose.”
600 mg/day of standardized root extract for 8 weeks.
No serious adverse events; the extract was well tolerated over 8 weeks.
Caveats
Small, industry-supported trial; short duration; measured stress scales rather than clinical diagnoses.
Transparency
Score history
Human review is pending for this listing.
Reviews
Shopper feedback
4.5
average rating
11,870 Amazon reviews were available from the listing metadata.