KSM-66 Ashwagandha Ashwagandha (Withania somnifera) is one of the most ancient adaptogenic herbs, used for thousands of years to maintain the body's internal balance. KSM-66 is a certified quality, patented extract made exclusively from the root of the plant, preserving the natural ratio of active ingredients. Our daily dose contains 250 mg of KSM-66 extract, of which 12.5 mg is withanolide - this ensures the product's constant and outstanding effectiveness.