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 3000 Liquid L carnitine containing Food Groups Healthy Products Containing Stock Vector (Royalty Free) 2219112733 Shutterstock Carnitine: Requirements, food sources, benefits, and risks L carnitine known as the energy nutrients, provides massive benefits to your heart and works best with Alpha Lipoic Acid.