Pure Encapsulations Ashwagandha provides 500 mg of high potency ashwagandha extract in each vegetarian capsule and is standardised to provide a guaranteed level of active phytonutrients known as withanolides. Ashwagandha has a long-history of use and is one of the most prized botanicals in traditional Ayurvedic medicine. Modern research interest has also resulted in several human clinical trials documenting its use.