High l Carnitine Ingestion Impairs Liver Function by Disordering Gut Bacteria Composition in Mice Journal of Agricultural and Food Chemistry L carnitine is a naturally occurring amino acid structure that is made in the human brain, liver, and kidneys. L carnitine plays a critical role in energy production, as it converts fat into energy. Dietary l carnitine supplementation increases lipid deposition in the liver and muscle of yellow catfish (Pelteobagrus fulvidraco) through changes in lipid metabolism British Journal of Nutrition Cambridge Core Frontiers Role of Carnitine in Non alcoholic Fatty Liver Disease and Other Related Diseases: An Update Frontiers L carnitine: new perspectives on the management of preterm infants