
NOW Supplements, Ashwagandha 450 mg (Standardized Extract)…
Cost per serving
$0.10
90 servings · ~90-day supply
Ashwagandha (a standardized root extract such as KSM-66) is among the more-studied botanicals people take for stress. Below, the ashwagandha ksm-66 products people use ranked by real cost per dose (to the commonly-studied 600 mg dose). A value comparison, not medical advice.
Updated September 2026
Several small randomized trials report reduced perceived stress and cortisol at 300–600 mg/day of a standardized extract; trials are short and small, so treat it as promising, not proven.
Commonly used: 300–600 mg/day standardized extract.
How this list is built: these are ashwagandha ksm-66 products ranked by real cost per dose across our whole ashwagandha ksm-66 catalogue — not filtered or re-ordered by anxiety and stress. We don’t hold per-product evidence for a specific use, so we don’t pretend to rank for one. Products whose own label says they are for something else are left out.
Background on ashwagandha ksm-66 from the NIH Office of Dietary Supplements .

NOW Supplements, Ashwagandha 450 mg (Standardized Extract)…
Cost per serving
$0.10
90 servings · ~90-day supply

ML Naturals Ashwagandha Powder 600mg
Cost per serving
$0.10
120 servings · ~120-day supply

Temimar Ashwagandha Supplements
Cost per serving
$0.10
120 servings · ~120-day supply

Nutricost Ashwagandha Herbal Supplement 600mg
Cost per serving
$0.12
120 servings · ~120-day supply

Kaya Naturals Ashwagandha 1300mg, 120 Count Capsules
Cost per serving
$0.12
120 servings · ~120-day supply

Carlyle KSM-66 Ashwagandha Root Extract 600mg | 120 Vegan…
Cost per serving
$0.13
120 servings · ~120-day supply

ZEBORA Ashwagandha Supplements 1000mg for Women & Men
Cost per serving
$0.13
120 servings · ~120-day supply

Dr. SImi Ashwagandha + Vitamin D2 Gummies Stress and Mood…
Cost per serving
$0.17
60 servings · ~60-day supply

Organic Ashwagandha Root Powder 1200mg - 120 Veggie Capsules…
Cost per serving
$0.18
120 servings · ~120-day supply
See the full ranking, benchmarks and lab-tested brands on best ashwagandha ksm-66 by cost per dose.
Several small randomized trials report reduced perceived stress and cortisol at 300–600 mg/day of a standardized extract; trials are short and small, so treat it as promising, not proven. This page ranks the products people take by real cost per dose; it does not claim a supplement treats or cures anything. Not medical advice — talk to a clinician about anxiety and stress.
As of September 2026, the best value we track is NOW Supplements, Ashwagandha 450 mg (Standardized Extract), 90 Veg Caps. The full ranking by cost per dose is above; Price ÷ servings ÷ dose — the number retailers rarely divide out.
Commonly 300–600 mg/day standardized extract. This is a general reference, not a prescription — confirm the right amount for you with a clinician. Not medical advice.