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 From the Literature Circulation ACETYL L CARNITINE 250 MG 60 CAPS PURE ENCAPSULATION The gut microbiome in coronary artery disease and heart failure: Current knowledge and future directions eBioMedicine L Carnitine: Benefits, Uses, Side Effects, and More L Carnitine: Benefits, Side Effects, Uses, Dosage and Research