L Carnitine Benefits, Uses, Dosage, Foods, Side Effects Dr. Axe Carnitine, Boost Your Energy, Weight Loss and Health Uses. L Carnitine L Carnitine doesnt magically burn fat, it helps your body use fat as energy. Combine it with training and consistency, and youll feel the difference @Marybosch shows us how L Carnitine will boost L Carnitine Explained: What This Amino Acid Does for Your Body Early research into L carnitine was often cited as underwhelming, showing negligible changes in muscle carnitine content and fat loss outcomes. However, these findings may have been limited by a short study window