Simultaneous quantification of trimethylamine oxide and its precursors from gut microbial metabolic pathway Comparison of short term and long term effects of peroral L carnitine intake: clinical implications of elevated TMAO levels in cardiovascular complications Oolong Tea Extract and Citrus Peel Polymethoxyflavones Reduce Transformation of l Carnitine to Trimethylamine N Oxide and Decrease Vascular Inflammation in l Carnitine Feeding Mice Journal of Agricultural and Food Chemistry Carnitine, Choline, Cancer, & Cholesterol: The TMAO Connection