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 Supplement Liquid L Carnitine 1000mg NOW Foods High in L Carnitine for Energy and Health Marnys L Carnitine Linus Pauling Institute Oregon State University L Carnitine Liquid 3000 mg, 16 oz. NOW Foods Fruitful Yield L carnitine known as the energy nutrients, provides massive benefits to your heart and works best with Alpha Lipoic Acid.