L Carnitine Benefits, Uses, Dosage, Foods, Side Effects Dr. Axe Role of carnitine in disease Nutrition & Metabolism Springer Nature Link 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 How L Carnitine Helps Turn Fat Into Energy (Without Stimulants)