Amazon.com: Best Naturals Acetyl L Carnitine 500 Mg & L Lysine 500 mg : Health & Household Spring Valley L Lysine 500 mg 250 Count 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 Amino acids are a team And they work better together than alone We've got options like Amino Acid Blend, L Arginine, L Carnitine, L Lysine, and L Glutaminebut the real magic happens when they're combined Role of carnitine in disease Nutrition & Metabolism Springer Nature Link