Carnitine plays crucial role in energy production esp for the heart, fueling mitochondria (cell furnaces). Highest food source? Only animal food, especially red meat; lamb and beef are best. (Redder the L carnitine: Science Backed Benefits, Risks, and More HealthWise L Carnitine pure amino acid powder Study reveals how red meat harms the heart. A species of gut bacteria, more abundant in red meat eaters, is key in turning a dietary nutrient called carnitine into TMAO which promotes blood clotting Red Meat and Heart Disease: The Hidden Role of microbial L Carnitine & Choline Prof Luigi Fontana Does Carnitine from Red Meat Cause Heart Disease? Diagnosis Diet