5 Health Benefits of L Carnitine Meet L Carnitine a naturally occurring amino acid that plays a key role in helping the body convert fat into usable energy. It works by transporting fatty acids into your cells to L Carnitine in Mitochondria Encyclopedia MDPI Your dog's heart works hard and L Carnitine helps fuel every beat. This natural protein like substance supports healthy heart function by helping carry fatty acids to where the body needs them most. Understanding the Benefits and Uses of Carnitine in Health and Fitness Fitness Health Acetyl L Carnitine