15 Health Benefits of Ashwagandha. Ashwagandha is a famous ancient herb with a rich history of Ayurvedic medicine. Reduce Stress: Ashwagandha significantly lowers stress levels. Relieve Anxiety: Helps in reducing anxiety. Improve Sleep Quality: Shows improvement in sleep efficiency and duration. Boost Well-being: Feel increased calmness and mental clarity. Lower Cortisol: Proven to reduce serum cortisol levels. Enhance Athletic Performance: Positive impact on athletic performance and VO2 max.