KSM-66 Ashwagandha is an extract obtained from roots. Ashwagandha (Withania somnifera) has been used in the Indian tradition of Ayurveda to support musculoskeletal function and as a tonic to promote overall health. Experimental studies demonstrate that Ashwagandha is an adaptogen that supports resistance to physical. biological. and chemical stresses and supports endurance. muscle recovery and cognitive health.