Characterization of TMAO productivity from carnitine challenge facilitates personalized nutrition and microbiome signatures discovery Microbiome Springer Nature Link Simultaneous quantification of trimethylamine oxide and its precursors from gut microbial metabolic pathway Intestinal microbiota metabolism of l carnitine, a nutrient in red meat, promotes atherosclerosis Nature Medicine This molecule links your diet to stroke and Alzheimer'shere's how to stop it