Identification of TMAO producer phenotype and hostdietgut dysbiosis by carnitine challenge test in human and germ free mice Gut Dietary allicin reduces transformation of L carnitine to TMAO through impact on gut microbiota ScienceDirect Dietary supplementation of l carnitine ameliorates metabolic syndrome independent of trimethylamine N oxide produced by gut microbes in high fat diet induced obese mice Food & Function (RSC Publishing) Gut Microbiota and Ischemic Stroke: The Role of Trimethylamine N Oxide