L Carnitine Vitamin Supplement for Energy and Metabolism Boost 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 Source Naturals L Carnitine Capsules 250mg, 120 ct Smith's Food and Drug Carnitine Rich Foods: Understanding L Carnitine and Its Benefits Loyal