For stress relief and cortisol management, this delivers 600mg of **KSM-66 Ashwagandha** per capsule — hitting the top of the 300–600mg clinical range used in research. KSM-66 is the most studied branded ashwagandha extract, standardized to a minimum 5% withanolides, and multiple RCTs show it can reduce your perceived stress and lower cortisol levels within 8 weeks.

The formula includes 5mg of **BioPerine** (black pepper extract) to support absorption. The single-capsule serving keeps things simple, and the 60-capsule count gives you a full two-month supply at one per day.

One thing to keep in mind: ashwagandha may interact with thyroid medications and is not recommended during pregnancy. If you're taking it for sleep support, some studies used doses split between morning and evening, so a single 600mg dose may work differently than two 300mg doses spread throughout your day.

BioStacks
Nutricost

KSM-66, Ashwagandha Root Extract, 60 Capsules

1 Capsule · 60 servings · $0.25/serving

81 / 100Excellent

Score Breakdown

Formulation
81
Safety
100
Final score
81/100

Ingredients (2)

Organic KSM-66 Ashwagandha Extract600 mg

Optimal dose · Premium form

BioPerine Black Pepper Extract5 mg

Within effective range

Other Ingredients

Fillers, coatings, and additives

4Safe

Magnesium StearateLubricant

Safe

Silicon DioxideAnti-caking

Safe

HypromelloseCapsule

Safe

StarchBinder

Safe

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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.