This stuff is fabulous. I have been suffering from severe tennis elbow for months, which has hampered my ability to play tennis or lift weights. After a week and a half on sweetamine, I hit the tennis courts. I hyperextended my elbow in the first 10 minutes of playing, which would ordinarily sideline me for almost a week. However, I kept playing, and thanks to sweetamine, the pain went away and I was able to play for 3 straight hours.