I have severe muscle weakness in my legs. Doctors say they can not help me other than working out, which leaves me very sore and very little results. Immediately after taking my Ist 5 pills, I got an huge burst of energy and could walk up stairs without holding onto the rails. I don’t have the soreness after working out, like before. It’s been a life changer for me. I can actually feel my muscles responding. Great, great product!!!!