This **KSM-66 Ashwagandha** delivers a full 600mg per 2-capsule serving for stress and cortisol support, landing right at the top of the 300–600mg range used in clinical trials. KSM-66 is the specific branded root extract behind many of those stress studies, standardized to more than 5% withanolides — the compounds that drive its calming effect. Follow the label's 2-capsule daily direction and you're getting the complete studied dose.
Take just one capsule and you drop to 300mg, the bottom of the effective range, so you'd feel a partial effect at best. The full serving is where the cortisol and perceived-stress benefits show up most consistently, and there's growing evidence it helps sleep quality too — especially when stress is what's keeping you up.
One thing to know: ashwagandha isn't recommended during pregnancy, so skip it if that applies to you.
BioStacks
Planetary Herbals
KSM-66® Ashwagandha Root Extract, 60 Vegetarian Capsules (300 mg per Capsule)
2 Capsules
Best for
Ingredients (1)
Organic KSM-66® AshwagandhaRoot Extract
100%Dose
600 mg
Target
300–600 mg
Form
Premium
Other Ingredients (3)
Magnesium StearateLubricant
A salt of stearic acid used as a lubricant in tablet and capsule production
HypromelloseCapsule
Plant-derived capsule material from cellulose
Stearic AcidLubricant
Saturated fatty acid used as tablet lubricant
How to Take It
Best taken in the evening
KSM-66 is root-only and less sedating than Sensoril. Trials have dosed it both morning and evening, so either works — take it with food.
With food
On the label
2 capsules daily.
General guidance based on the ingredients, not a substitute for the label or your doctor.
Price Check
$9.37
Cheaper than 95% of 141 ashwagandha supplements
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Sources & Scoring
Nutrient data (RDA, UL, and safety thresholds) sourced from: NIH Office of Dietary Supplements and National Academies Dietary Reference Intakes (DRI).
This is not medical advice. Consult a healthcare provider before making changes to your supplement routine.
The score analyzes what's on the label: ingredient doses vs. clinical ranges, chemical forms, evidence levels, and known interactions. It does not verify label accuracy or test for contaminants — for that, look for third-party certifications like USP or NSF.