AshwaBEST is the uniquely standardized ashwagandha extract based on USP method of analysis to make sure the correct & efficient dosage of withanolides and withano glycosides in small dosage like 100 or 150 mg x 2/day.  Many ashwagandha extracts were shown to provide low withanolides (even as low as 50 times) against their label claims and is adulterated with leaves though claims as root only extracts