Ingredient Spotlight: L Carnitine Source: Biosynthesised in the body from the amino acids Lysine and Methionine, L Carnitine is a conditionally essential nutrient involved in energy metabolism and fat transport. Key Benefits L carnitine: Science Backed Benefits, Risks, and More Dietary sources of choline, phosphatidylcholine, and L carnitine Download Scientific Diagram L carnitine known as the energy nutrients, provides massive benefits to your heart and works best with Alpha Lipoic Acid.