Cheap protein = expensive gut problems. Here's what to look for on the label before you buy Differential effects of oral and intravenous L carnitine on serum lipids: is the microbiota the answer? Dietary allicin reduces transformation of L carnitine to TMAO through impact on gut microbiota ScienceDirect Identification of TMAO producer phenotype and hostdietgut dysbiosis by carnitine challenge test in human and germ free mice Gut Comparison of short term and long term effects of peroral L carnitine intake: clinical implications of elevated TMAO levels in cardiovascular complications