Identification of TMAO producer phenotype and hostdietgut dysbiosis by carnitine challenge test in human and germ free mice Gut Characterization of TMAO productivity from carnitine challenge facilitates personalized nutrition and microbiome signatures discovery Microbiome Springer Nature Link What Is Carnitine? TMAO? What's Their Link To Red Meat? Pritikin TMAO Is Both a Biomarker and a Renal Toxin Circulation Research Too Much TMAO is Bad for Your Health Carnitine metabolism in the human gut: characterization of the two component carnitine monooxygenase CntAB from Acinetobacter baumannii Journal of Biological Chemistry