Levocarnitine, commonly known as L Carnitine, is a naturally occurring compound that the body produces from the amino acids lysine and methionine. It plays a critical role in energy production by transporting fatty L Carnitine food supplement molecule Stock Image Science Source Images L Carnitine Linus Pauling Institute Oregon State University Doctor's Best L Carnitine Fumarate with Biosint Carnitines, 855 mg, 60 Source Naturals Acetyl L Carnitine and Alpha Lipoic Acid 650 mg 120 Tablets