L Carnitine is often marketed as a fat burner, but most people dont realize that oral and injectable L Carnitine are not the same..Oral L Carnitine has poor absorption (only 20% bioavailability), The Role of l Carnitine in Mitochondria, Prevention of Metabolic Inflexibility and Disease Initiation L Carnitine (Label) Dietary Supplement Label Database (DSLD) NIH Office of Dietary Supplements Liquid L Carnitine Energy, Metabolism & Fat Burning