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 Understanding the Benefits and Uses of Carnitine in Health and Fitness Fitness Health Carnitine: Genetic Variants Affecting Mitochondrial Energy and Health L Carnitine: Benefits, Uses, and Side Effects Lifespan Research Institute The Science of Carnitine: How It Works and Why It Matters