L Carnitine for Fat Loss: Why Most Supplements Fail (and What Actually PEScience 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 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 Carnitine: the claims and why it may not work