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KSM-66 vs Sensoril Ashwagandha (Nootropics Depot vs Jarrow) (2026)
Disclosure: We earn commissions on purchases made through our links. This never influences our scores. Editorial policy
The Verdict
Nootropics Depot KSM-66 (A overall) takes the top spot with strong scores across the board. Jarrow's KSM-66 (A- overall) is a close second using the same extract at a slightly lower value. Life Extension's Sensoril (A- overall) is the best choice if cortisol reduction is your primary goal. For general stress and adaptogen benefits, KSM-66 products have a slight edge in published evidence volume.
KSM-66 Ashwagandha Extract 300mg
Nootropics Depot
KSM-66 Ashwagandha 300mg
Jarrow Formulas
Optimized Ashwagandha (Sensoril)
Life Extension
Head-to-Head Comparison
| Category | KSM-66 Ashwagandha Extract 300mg Nootropics Depot | KSM-66 Ashwagandha 300mg Jarrow Formulas | Optimized Ashwagandha (Sensoril) Life Extension |
|---|---|---|---|
| Overall | A | A- | A- |
| Evidence | A | A | A- |
| Quality & Purity | A- | B | B |
| Value | A | A | B |
| Transparency | A | A | A |
| Cost/Day | $0.25Winner | $0.30 | $0.35 |
| Dose/Serving | 300mg | 300mg | 125mg |
| Form | KSM-66 Root Extract (5% withanolides) | KSM-66 Root Extract (5% withanolides) | Sensoril Root + Leaf Extract (10% withanolides) |
| Third-Party Tested | ✓ Yes | No | ✓ Yes |
| Proprietary Blend | No | No | No |
Why This Comparison Matters
KSM-66 and Sensoril are the two most clinically studied branded ashwagandha extracts, and this is the most debated comparison in the adaptogen world. They are not the same thing. KSM-66 is a full-spectrum root extract standardized to 5% withanolides. Sensoril is a root and leaf extract standardized to 10%+ withanolides and 32%+ oligosaccharides.
The clinical evidence supports both, but for slightly different applications. KSM-66 has more published data on stress reduction, testosterone, and athletic performance. Sensoril has strong data on cortisol reduction and cognitive function. Choosing between them depends on your primary goal.
We compare a KSM-66 product from Nootropics Depot, the KSM-66 version from Jarrow, and Life Extension's Sensoril product to show how the extracts and brands stack up.
Detailed Score Breakdown
KSM-66 Ashwagandha Extract 300mg
Nootropics Depot
KSM-66 is the most clinically studied ashwagandha extract with 24+ published clinical trials
Uses genuine KSM-66 with certificate of analysis available, third-party tested in-house and externally
$0.25/day at 600mg (2 capsules) - excellent value for genuine KSM-66
Full ingredient disclosure, KSM-66 certification, withanolide content specified on label
Nootropics Depot is known in the supplement community for rigorous quality testing and genuine ingredient sourcing
KSM-66 Ashwagandha 300mg
Jarrow Formulas
KSM-66 extract with the full clinical evidence base behind it
GMP facility, uses licensed KSM-66, no independent sport certification
$0.30/day at 600mg (2 capsules) - strong value for a branded KSM-66 product
Full disclosure of extract type, withanolide standardization, no proprietary blends
Well-established supplement brand with a straightforward KSM-66 product at a competitive price
Optimized Ashwagandha (Sensoril)
Life Extension
Sensoril extract (10% withanolides) has multiple RCTs supporting stress reduction and cortisol lowering
Life Extension uses third-party testing but does not hold NSF/USP sport certification
$0.35/day at 250mg (Sensoril clinical dose is 125-250mg due to higher withanolide concentration)
Full disclosure, Sensoril branding, withanolide standardization specified
Sensoril requires lower doses than KSM-66 due to higher withanolide concentration (10% vs 5%)
How We Compared These Products
Every product in our database is scored on four equally-weighted categories: clinical evidence quality, third-party testing and purity verification, cost per clinically effective dose (not cost per pill), and label transparency. These scores combine into an overall letter grade from A+ through F.
Cost per effective dose is calculated using the clinically studied dose from published research, not the manufacturer's suggested serving. If a product requires multiple servings to reach the dose used in clinical trials, that cost is reflected in the value score.
For a full explanation of our scoring methodology, see our methodology page. Prices were last checked on the dates listed for each product and may have changed.
More Ashwagandha Comparisons
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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.