Role of carnitine in disease Nutrition & Metabolism Springer Nature Link Carnitine Metabolism and Its Role in Fatty Acid Oxidation Creative Proteomics 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 Comparison of short term and long term effects of peroral L carnitine intake: clinical implications of elevated TMAO levels in cardiovascular complications