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Best Ashwagandha for Stress (2026)
Last reviewed: 2025-03-01 | Based on 10 products scored | Clinical dose: 300-600mg daily of a standardized root extract (KSM-66 or Sensoril)
Ashwagandha's evidence for stress reduction is its strongest clinical application. A 2021 systematic review of 12 RCTs found that ashwagandha supplementation significantly reduced cortisol levels and stress scores compared to placebo. KSM-66 at 300mg twice daily and Sensoril at 125-250mg daily are the two extracts with direct stress-reduction trial data. The cortisol-lowering mechanism is well-documented, with studies showing 14-28% reductions in serum cortisol. We scored ashwagandha products specifically for their stress-reduction evidence and extract quality.
Our Top Picks
KSM-66 Ashwagandha Extract 300mg
$0.25/day at effective dose
Ashwagandha 450mg Standardized Extract
$0.14/day at effective dose
KSM-66 Ashwagandha 600mg
$0.42/day at effective dose
Detailed Reviews
KSM-66 Ashwagandha Extract 300mg
KSM-66 Root Extract (5% withanolides) | 300mg/serving | 180 servings
Nootropics Depot is known in the supplement community for rigorous quality testing and genuine ingredient sourcing
Check Price on Amazon →KSM-66 Ashwagandha 600mg
KSM-66 Root Extract (5% withanolides) | 600mg/serving | 90 servings
600mg per capsule means you only need 1 capsule for a full clinical dose
Check Price on Amazon →KSM-66 Ashwagandha 300mg
KSM-66 Root Extract (5% withanolides) | 300mg/serving | 120 servings
Well-established supplement brand with a straightforward KSM-66 product at a competitive price
Check Price on Amazon →Also Scored
Optimized Ashwagandha (Sensoril)
$0.35/day | Sensoril Root + Leaf Extract (10% withanolides)
Ashwagandha 450mg Standardized Extract
$0.14/day | Root Extract (2.5% withanolides)
Ashwagandha 500mg
$0.52/day | Root Extract (2.5% withanolides)
Organic Ashwagandha 670mg
$0.28/day | Organic Root Extract + Supercritical CO2 Root Extract
mykind Organics Ashwagandha
$0.50/day | KSM-66 Root Extract + Organic Ginger + Organic Probiotics
Ashwagandha Root Liquid Phyto-Caps
$0.67/day | Root Extract (liquid phyto-cap)
Ashwagandha 1000mg
$0.23/day | Root Extract (standardization not specified)
What to Look For When Buying
- ✓KSM-66 at 600mg daily (usually split 300mg twice) has the most RCTs showing cortisol reduction and stress score improvements
- ✓Sensoril at 125-250mg daily is effective at a lower dose because it is extracted from both root and leaf (higher withanolide concentration)
- ✓Both KSM-66 and Sensoril work - KSM-66 has more studies, Sensoril works at a lower dose; neither is clearly superior
- ✓Effects are typically noticeable within 2-4 weeks of consistent use, with peak effects at 8-12 weeks
- ✓Ashwagandha may interact with thyroid medications, immunosuppressants, and sedatives - check with your healthcare provider
- ✓Cycling (8 weeks on, 2-4 weeks off) is sometimes recommended, though there is no strong evidence requiring it for safety in healthy adults
Frequently Asked Questions
What is the difference between KSM-66 and Sensoril?
Both are clinically studied standardized ashwagandha extracts, but they differ in composition. KSM-66 is a full-spectrum root extract standardized to 5% withanolides. Sensoril uses both root and leaf, standardized to 10% withanolides, so it requires a lower dose (125-250mg vs 300-600mg). Both have clinical evidence for stress reduction. KSM-66 has more published trials overall (24+).
When should I take ashwagandha - morning or night?
There is no definitive evidence that timing matters significantly. For stress and anxiety, many people take it in the morning. For sleep benefits, taking it in the evening may be preferable. Some studies used twice-daily dosing (300mg morning and evening). Consistency matters more than timing.
How long does ashwagandha take to work?
Most clinical trials showing significant effects ran for 8-12 weeks. Some participants notice reduced stress within 2-4 weeks, but the full benefit typically develops over 6-12 weeks of consistent daily use. Do not expect immediate effects.
Can ashwagandha cause liver damage?
There have been rare case reports of liver injury associated with ashwagandha, which led to regulatory attention in some countries. However, controlled clinical trials have not found liver toxicity at standard doses. If you have pre-existing liver conditions, consult your doctor before use and monitor liver enzymes.
Is ashwagandha safe to take with medications?
Ashwagandha may interact with thyroid medications (it can increase thyroid hormone levels), immunosuppressants, sedatives, and blood sugar-lowering drugs. It should be discontinued 2 weeks before surgery. Always consult your doctor if you take any medications.
FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. The products discussed on this page are not intended to diagnose, treat, cure, or prevent any disease. Always consult with a qualified healthcare professional before starting any supplement regimen.