Lysine: Sources, Metabolism, Physiological Importance, and Use as a Supplement Levocarnitine, commonly known as L Carnitine, is a naturally occurring compound that the body produces from the amino acids lysine and methionine. It plays a critical role in energy production by transporting fatty 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 Amazon.com: Best Naturals Acetyl L Carnitine 500 Mg & L Lysine 500 mg : Health & Household l Carnitine Supplementation in Recovery after Exercise Role of carnitine in disease Nutrition & Metabolism Springer Nature Link