L Carnitine Benefits, Uses, Dosage, Foods, Side Effects Dr. Axe 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 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 Source Naturals L Carnitine Capsules 500mg, 120 ct Smith's Food and Drug L carnitine known as the energy nutrients, provides massive benefits to your heart and works best with Alpha Lipoic Acid.