Understanding the Benefits and Uses of Carnitine in Health and Fitness Fitness Health L Carnitine Liquid Benefits Explained: A Guide The Science of Good Health Ultra L Carnitine NutriRestore L Carnitine Benefits, Uses, Dosage, Foods, Side Effects Dr. Axe 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