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