L Carnitine is an amino acid found in high concentrations in muscle, heart, and liver tissues. Inside the cells, L Carnitine transports fatty acids into the mitochondria for energy production (i.e., ATP) and reduces Carnitine: Genetic Variants Affecting Mitochondrial Energy and Health Carnitine, Acylcarnitines and Beta Oxidation L carnitine Could Be Beneficial in Nonalcoholic Fatty Liver Disease Patients by Improving Choline Metabolism and Reducing Liver Biomarkers European Medical Journal L Carnitine Linus Pauling Institute Oregon State University