L carnitine for metabolism Lifehack Hepatic Carnitine Palmitoyltransferase (CPT) System: Gateway to Fatty Acid Oxidation Long chain fatty acids cannot directly cross the inner mitochondrial membrane. The hepatic carnitine shuttle system, led by CPT I and Meet L Carnitine a naturally occurring amino acid that plays a key role in helping the body convert fat into usable energy. It works by transporting fatty acids into your cells to L Carnitine: Does It Really Help With Fat Loss? Supplement Store Lebanon Best Supplements in Beirut Scitec Nutrition Lebanon Carnitine transport and fatty acid oxidation ScienceDirect