Frontiers The gut microbial metabolite trimethylamine N oxide and cardiovascular diseases All You Need To Know About L Carnitine HealthKart Simultaneous quantification of trimethylamine oxide and its precursors from gut microbial metabolic pathway Elucidation of an anaerobic pathway for metabolism of l carnitinederived butyrobetaine to trimethylamine in human gut bacteria PNAS Cheap protein = expensive gut problems. Here's what to look for on the label before you buy