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 Cardiomyopathies in cats Veterinarian Karlsruhe Arndt Small Animal Center TCfeline Special Formula Premix Feline Future Cat Food Company Protein Deficiency in Cats: Signs, Causes and How to Fix It