Standardized root extract, >=5% withanolides (KSM-66-type)
Standardized root extract, >=5% withanolides (KSM-66-type) is a tier 1 form of Ashwagandha (Withania somnifera), used in 216 on-market products .
216
on-market products
tier 1
quality tier
n/a
elemental fraction
Typical standardization: >=5% withanolides, root-only, aqueous extraction
Why this tier: This is the specific material used in the largest and most-cited RCT and multiple subsequent trials -- the strongest direct clinical evidence base of any commercial ashwagandha form.
Source: Chandrasekhar K et al. 2012, Indian J Psychol Med 34(3):255-262, PMID 23439798