If you've compared ashwagandha products, you'll have hit a wall of extract names — KSM-66, Sensoril, “full-spectrum,” “10:1.” This guide translates them into plain English so you can compare like with like.
I'm Barry Lees, founder of The Health Improvers. This is educational buyer information, not medical advice or a health claim.
First: what “extract” means
Most quality ashwagandha isn't raw powdered root — it's an extract, where the plant material is concentrated. A ratio like “10:1” means ten parts raw herb were used to make one part extract. The other key marker is the withanolide percentage — the naturally occurring compounds used to indicate strength.
KSM-66
KSM-66® is a branded, root-only extract standardised to a high withanolide level. It's one of the most clinically studied ashwagandha extracts, which is why many premium products use it. Root-only sourcing is often preferred for consistency and traditional alignment.
Sensoril
Sensoril® is another branded extract, drawn from root and leaf, and typically standardised to a higher withanolide percentage. It's usually taken at a smaller serving size than KSM-66. Different profile, different typical dose — neither is automatically “better.”
Full-spectrum and generic extracts
“Full-spectrum” generally means the extract aims to reflect the whole root's natural profile rather than isolating specific compounds. Unbranded generic extracts vary widely in quality and standardisation — the label should still state the withanolide percentage and the amount per serving.
What to compare on the label
- Extract type — branded (KSM-66/Sensoril) or generic; root-only or whole-plant.
- Withanolide % — the strength marker.
- Amount per serving — e.g. many KSM-66 products use around 600mg per day.
- Fillers, vegan status, and where it's made.
Remember that a higher withanolide percentage in a tiny serving isn't necessarily more than a moderate percentage in a larger serving — compare the actual amounts.
Our approach
Our Ashwagandha KSM-66 uses the clinically studied, root-only KSM-66 extract at a 600mg serving. New to the herb altogether? Start with what ashwagandha actually is, and see the wider category in our honest UK ashwagandha buyer's guide.
Written by Barry Lees, founder of The Health Improvers. This article is for general information and education only. It is not medical advice and does not diagnose, treat or prevent any condition. KSM-66® and Sensoril® are registered trademarks of their respective owners. Food supplements are not a substitute for a varied diet and healthy lifestyle. Always read the label.
Sources: manufacturer technical documentation for KSM-66 and Sensoril; GB Nutrition and Health Claims Register; peer-reviewed literature on Withania somnifera extracts.
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