L Carnitine: Benefits, Side Effects, FAQ, Sources, and Dosage Supplements don't replace the workbut they can support it L Carnitine helps your body turn fat into usable energy, so you can push harder and recover better. Consistency first. Supplements second. Results L Carnitine Dosage Guide: How Much Should You Take? Carnitine Deficiency: What Is It, Causes, Symptoms, and More Osmosis Does L Carnitine Work for Fat Loss? A Dietitian Explains