What is KSM-66?
KSM-66 is a branded, standardised extract of ashwagandha root used widely in stress, sleep, and recovery supplements. It is made from the root only and standardised to a consistent level of withanolides, the plant's main active compounds.
KSM-66 is one specific extract rather than a plant, so it should not be read as interchangeable with any ashwagandha powder. It draws on the adaptogen tradition and is standardised to its withanolides, which sets it apart from cheaper material that lists no standardised extract figure. Being a proprietary blend is a separate concern, since KSM-66 is a single named ingredient with a disclosed extract.
KSM-66 suits people who want a well-characterised ashwagandha with a defined dose behind it. The catch is that the name signals identity and consistency, not a guarantee of results for you, and buying a product with KSM-66 on the label still means checking that the dose per serving matches what studies used. A trace amount is still a trace amount.
For a full-strength option, see our Ashwagandha Plus.
Frequently asked questions
How is it different from standard ashwagandha?
Standard ashwagandha can be raw powder or an undefined extract of leaf and root, whereas KSM-66 is a root-only extract standardised to a set withanolide level. That consistency is the main practical difference.
Who uses it, or when is it the right choice?
It fits people who want a predictable, research-aligned ashwagandha for stress and recovery. Choosing it makes most sense when the label also states the milligrams per serving.
When is it the WRONG choice?
It is the wrong pick if you specifically want a whole-herb or leaf preparation, which KSM-66 is not. It also adds little if the serving size is too small to reach a meaningful dose.