Biomedical Reports Carnitine Deficiency: What Is It, Causes, Symptoms, and More Osmosis 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. Hepatoprotective effect of combination of L carnitine and magnesium hydroxide in nonalcoholic fatty liver disease patients: a do Hepatoprotective effect of combination of L carnitine and magnesium hydroxide in nonalcoholic fatty liver disease patients: a do Effect of l carnitine supplementation on lead acetate induced liver cell apoptosis and inflammation: role of caspase 3 and glycogen synthase kinase 3 enzymes ScienceDirect