Identification of TMAO producer phenotype and hostdietgut dysbiosis by carnitine challenge test in human and germ free mice Gut A Review of The Contribution of Gut Dependent Microbiota Derived Marker, Trimethylamine N oxide (TMAO), in Coronary Artery Disease Current Research in Nutrition and Food Science Journal Differential effects of oral and intravenous L carnitine on serum lipids: is the microbiota the answer? Cheap protein = expensive gut problems. Here's what to look for on the label before you buy