Research Science Update L Carnitine L Tartrate Supplementation Impr Prosource 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 L Carnitine L Tartrate 750 mg Carnipure JustLoading L Carnitine Tartrate Supplementation for 5 Weeks Improves Exercise Recovery in Men and Women: A Randomized, Double Blind, Placebo Controlled Trial L Carnitine Tartrate Amino Acid 1,500 mg Benevolent Nourishment