I started taking L-Carnitine originally for it's touted fat burning benefits, but instead found it more helpful for recovering from my workouts and achieving faster strength gains. I recover way faster now, and I have put 40lbs on my bench press in just a little over a month, which is really fast for me. (all my lifts have improved dramatically)My cardio endurance has really improved as well. One of the best benefits is better mental functioning and memory, which I was starting to have trouble with from a lack of sleep. This stuff is actually used to treat Alzheimers patients to improve mental functioning as well as Heart attack victims to rebuild cardiac tissue. This stuff rocks, and now I won't be without it