What Is L Carnitine? Benefits for Runners, Dosage & How It Works RunStrong L Carnitine Liquid for Weight Loss 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 Most people in the industry say L Carnitine tartrate doesn't work but how does it give me energy? Most people report this so something is happening. 2nd Round Equestrian