L carnitine: Health Benefits, Side Effects, Uses, Dose & Precautions Metabolic Origins of Heart Failure ScienceDirect L Carnitine Chronic Heart Failure PeopleBeatingCancer Levocarnitine, commonly known as L Carnitine, is a naturally occurring compound that the body produces from the amino acids lysine and methionine. It plays a critical role in energy production by transporting fatty L Carnitine Supplement: Heart Concerns Advanced Molecular Labs Comparison of short term and long term effects of peroral L carnitine intake: clinical implications of elevated TMAO levels in cardiovascular complications