Systematic investigation of the relationships of trimethylamine N oxide and l carnitine with obesity in both humans and rodents Food & Function (RSC Publishing) Full article: Gut microbes with the gbu genes determine TMAO production from L carnitine intake and serve as a biomarker for precision nutrition JCI The contributory role of gut microbiota in cardiovascular disease Cheap protein = expensive gut problems. Here's what to look for on the label before you buy