What Is L Carnitine: Benefits, Side Effects, & More Swolverine 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 The Role of l Carnitine in Mitochondria, Prevention of Metabolic Inflexibility and Disease Initiation