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 L Carnitine ProSupps.com L carnitine known as the energy nutrients, provides massive benefits to your heart and works best with Alpha Lipoic Acid. L Carnitine Benefits, Uses, Dosage, Foods, Side Effects Dr. Axe L Carnitine Benefits for Fat Burning and How to Use ICONFIT