3000mg Per Serving - Max Strength. It's known for its restorative and rejuvenating benefits, and KSM-66 is one of the most popular and extensively researched extracts of Ashwagandha. Stress and Anxiety Reduction: One of the most well-known uses of Ashwagandha KSM-66 is its potential to lower cortisol levels and mitigate stress and anxiety.