NovaDiet Ashwagandha KSM-66 refers to an ashwagandha supplement using KSM-66, a branded, standardized extract of Withania somnifera root. Potential benefits Stress & anxiety: one of the better-supported uses; may help lower perceived stress and cortisol. Sleep: may improve sleep quality, particularly when stress is affecting sleep. Exercise & strength: some studies suggest improvements in strength, recovery, and exercise performance. Focus & mental wellbeing: may provide modest benefits for concentration and general wellbeing. Men's health: some studies suggest possible improvements in testosterone and sperm parameters, especially in men under significant stress or with fertility concerns.