Intestinal microbiota metabolism of l carnitine, a nutrient in red meat, promotes atherosclerosis Nature Medicine Differential effects of oral and intravenous L carnitine on serum lipids: is the microbiota the answer? Revisiting the Role of Carnitine in Heart Disease Through the Lens of the Gut Microbiota Identification of TMAO producer phenotype and hostdietgut dysbiosis by carnitine challenge test in human and germ free mice Gut Non lethal Inhibition of Gut Microbial Trimethylamine Production for the Treatment of Atherosclerosis: Cell Cheap protein = expensive gut problems. Here's what to look for on the label before you buy