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: Requirements, food sources, benefits, and risks L Carnitine A Beginner's Guide to L Carnitine Wonder Paws L carnitine known as the energy nutrients, provides massive benefits to your heart and works best with Alpha Lipoic Acid. NOW Foods L Carnitine Liquid with Vitamin B12 Support Swanson Vitamins