6 potential benefits of l carnitine Good Food What is L Carnitine? L Carnitine is a naturally occurring amino acid derivative that the human body can synthesize itself. It is mainly found in red meat and dairy products. [1] Core Benefits of 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 L Carnitine 3000 Liquid NOW Foods L Carnitine 1000 mg 100 Tablets L Carnitine is Underrated. New Meta Review Reminds Us Why.