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 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. L Carnitine food supplement molecule Stock Image Science Source Images Thorne Acetyl L Carnitine Dietary Supplement, 500 mg Essential L Carnitine Optimal Health Systems