L-Carnitine is an important amino acid that promotes energy production in cells by transporting fatty acids into the mitochondrion. It helps the body to efficiently convert fatty acids into fuel your body can use for energy. L-Carnitine 2000 Xtreme contains 1800 mg of pharmaceutical grade L-Carnitine per serving in a great-tasting liquid delivery system. It also includes 200 mg Acetyl-L-Carnitine, an important neurotransmitter for brain and nerve cell function.