L Carnitine Linus Pauling Institute Oregon State University L Carnitine, Amino Acid, Mixed Berry, 3,000 mg, 16 oz (473 ml) L Carnitine: Benefits, Side Effects, And Dosage, Per Dietitians Acetyl L Carnitine HCL Enhance Energy, Fat Metabolism & Cognitive Function 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