Carnitine: the claims and why it may not work Role of carnitine in disease Nutrition & Metabolism Springer Nature Link Role of L carnitine in the transport of long chain fatty acids through Download Scientific Diagram Carnitine: Genetic Variants Affecting Mitochondrial Energy and Health L carnitine tartrate vs other forms of carnitine which is better Infinite Labs 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.