L Carnitine Swanson Vitamins L carnitine known as the energy nutrients, provides massive benefits to your heart and works best with Alpha Lipoic Acid. Carnitine: Requirements, food sources, benefits, and risks NOW Foods L Carnitine Liquid with Vitamin B12 Support Swanson Vitamins Foods High in L Carnitine for Energy and Health Marnys 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