L carnitine for metabolism Lifehack Didn't another study show carnitine was good for the heart? L carnitine is a naturally occurring compound that helps your body convert fat into energy. It's often used as a supplement for fitness, weight loss, and overall health. #lcarnitine #fitnesslife #supplements #gymaddict #gymmotivation Efficacy of L carnitine supplementation for improving lean body mass and physical function in patients on hemodialysis: a randomized controlled trial European Journal of Clinical Nutrition