When to Take L Carnitine for Weight Loss & Maximize 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 Your body already knows how to burn fat. It just needs the right transporter. L Carnitine helps move stored fat into your mitochondria, where it gets used as energy, not stored. That's why Does L Carnitine Really Burn Fat Without Exercise?