Ashwagandha (Withania somnifera) is an evergreen shrub and adaptogenic herb used in traditional Ayurvedic medicine. Extracts often come from roots or leaves. KSM-66® ashwagandha in particular is the most thoroughly researched ashwagandha in the world, and so we use this form in all of our products. This herb is clinically shown to promote stress resilience, enhance mood, and keep the individual calm.