L carnitine supplementation attenuates NAFLD progression and cardiac dysfunction in a mouse model fed with methionine and choline deficient diet ScienceDirect Frontiers Lcarnitine in metabolic dysfunction associated steatotic liver disease: mechanisms and therapeutic potential Impaired brain function improved by l carnitine in patients with cirrhosis: evaluation using near infrared spectroscopy Scientific Reports 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