Been taking L-Carnitine for about 6 months now, and have lost about 15lbs. and 25 inches over all, along with taking CLA and RoxyLean. Basically L-Carnitine works by breaking up long chain fatty tissue deep in your muscles, so your body can use it for energy. It works almost like that lotion stuff you use for cellulite, only better. There are no side effects I've noticed. But with anything diet and exercise is the key, this just helps give your body a boost.