L Carnitine Liquid Benefits Explained: A Guide The Science of Good Health 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 If you're putting in the work but the scale isn't moving, your body might just need a little help tapping into its fat stores. That's where L Carnitine comes in. It's not a Lcarnitine for Fat Loss: Does it Work? Benefits, Warnings