Does L Carnitine Work for Weight Loss? What the Science Says If you are like a lot of people, you may have never heard of carnitine but this important nutrient is critical for our body's ability to optimally burn fat required for energy. Carnitine Deficiency: What Is It, Causes, Symptoms, and More Osmosis Nanoparticle mediated L carnitine delivery for improved male fertility ScienceDirect L Carnitine Is L Carnitine Safe? Watch FIRST BEFORE Taking L Carnitine Supplements