napfcheck L Carnitine for dogs and cats Low Level of Supplemental Dietary L carnitine Increases Energy Expenditure in Overweight, But Not Lean, Cats Fed a Moderate Ener WHEN DIETS HAVE INSUFFICIENT L CARNITINE, QUINICARN IS THE ANSWER! A dietary supplement for cats and dogs, providing active L carnitine is primarily synthesized in the liver from the amino acids lysine and methionine through a series of four enzymatic reactions, with the liver and kidneys converting the precursor butyrobetaine into active