SciELO Brasil Biomedical role of L carnitine in several organ systems, cellular tissues, and COVID 19 Biomedical role of L carnitine in several organ systems, cellular tissues, and COVID 19 Body first L CARNITINE 3000 mg 450 ml Swadesii L Carnitine Liquid Force Factor L Carnitine Liquid, Berry, 16 fl oz (473 ml) L Carnitine Ultimate Force Factor If you are like a lot of people, you may have never heard of carnitine but this important nutrient is critical for our body's ability to optimally burn fat required for energy.