Carnitine Rich Foods: Understanding L Carnitine and Its Benefits Loyal Carnitine plays crucial role in energy production esp for the heart, fueling mitochondria (cell furnaces). Highest food source? Only animal food, especially red meat; lamb and beef are best. (Redder the The amount of L carnitine in product groups.. Download Scientific Diagram If you're looking to add some nutritious foods to your diet, don't forget the classics! Beef has so many research backed health benefits. Here are just a few.