Stress can have an adverse effect on your body. Fortunately, you can defend your body against these effects with Swanson Standardized Ashwagandha Extract. Ashwagandha (also known as winter cherry) is an adaptogenic herb that's been used in India for centuries to enhance the body's immune functions during high-stress situations. How does it work? The key to its effectiveness lies in constituents known as withanolides, which help to normalize a wide range of biochemical functions. Our Ashwagandha Extract supplement is standardized to 2.5% withanolides for guaranteed potency.