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 L Carnitine Benefits: A Complete Research Based Guide If you're looking to add some nutritious foods to your diet, don't forget the classics! Beef has so many research backed health benefits. Here are just a few.