The effects of L carnitine supplementation on lipid profiles in adults: A systematic review and dose response meta analysis ScienceDirect Comparison of short term and long term effects of peroral L carnitine intake: clinical implications of elevated TMAO levels in cardiovascular complications L carnitine is a naturally occurring amino acid structure that is made in the human brain, liver, and kidneys. L carnitine plays a critical role in energy production, as it converts fat into energy. Revisiting the Role of Carnitine in Heart Disease Through the Lens of the Gut Microbiota The Importance of the Fatty Acid Transporter L Carnitine in Non Alcoholic Fatty Liver Disease (NAFLD)