L Carnitine Tartrate Pure Prescriptions L carnitine Tartrate in 1000 mg Capsules 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 Pharmacokinetics of L Carnitine Clinical Pharmacokinetics Springer Nature Link The Nutraceutical Value of Carnitine and Its Use in Dietary Supplements