Optimal DX FYI: Gut Microbes Increase TMAO Identification of TMAO producer phenotype and hostdietgut dysbiosis by carnitine challenge test in human and germ free mice Gut Simultaneous quantification of trimethylamine oxide and its precursors from gut microbial metabolic pathway Gut Microbiome Derived Metabolite Trimethylamine N Oxide Induces Aortic Stiffening and Increases Systolic Blood Pressure With Aging in Mice and Humans Hypertension