Analytical Method Development and Validation of Content of D Carnitine in Levocarnitine Using High Performance Liquid Chromatography What is L Carnitine? Wait, what is an Amino Acid? by Medium 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 Carnitine Metabolite of the month biocrates life sciences gmbh How L Carnitine Helps Turn Fat Into Energy (Without Stimulants)