Fatty Acid Oxidation Activation and Transportation of Fatty Acids to the Mitochondria via the Carnitine Shuttle with Animation Animations PharmaXChange.info L Carnitine for Fat Loss Supplements in Review 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 Carnitine wikidoc