Revisiting the Role of Carnitine in Heart Disease Through the Lens of the Gut Microbiota L carnitine supplements reduced lactate levels and heart rate; increased lipid metabolism, VO2max, oxygen consumption, and L carnitine plasma concentrations; improved performance Revisiting the Role of Carnitine in Heart Disease Through the Lens of the Gut Microbiota Losing weight with L carnitine supplements. Yes or no? Comparison of short term and long term effects of peroral L carnitine intake: clinical implications of elevated TMAO levels in cardiovascular complications L carnitine: Health Benefits, Side Effects, Uses, Dose & Precautions