Characterization of TMAO productivity from carnitine challenge facilitates personalized nutrition and microbiome signatures discovery Microbiome Springer Nature Link Revisiting the Role of Carnitine in Heart Disease Through the Lens of the Gut Microbiota 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 L Carnitine Male Enhancement: What the Evidence Shows for Energy, Sperm Health, and Performance