Losing weight with L carnitine supplements. Yes or no? Cheap protein = expensive gut problems. Here's what to look for on the label before you buy L Carnitine intake and high trimethylamine N oxide plasma levels correlate with low aortic lesions in ApoE transgenic mice expressing CETP ScienceDirect Simultaneous quantification of trimethylamine oxide and its precursors from gut microbial metabolic pathway