Cheap protein = expensive gut problems. Here's what to look for on the label before you buy Frontiers Effects of choline metabolitetrimethylamine N oxide on immunometabolism in inflammatory bowel disease Identification of TMAO producer phenotype and hostdietgut dysbiosis by carnitine challenge test in human and germ free mice Gut When to take L carnitine: Dosage, forms, and side effects Carnitine, Choline, Cancer, & Cholesterol: The TMAO Connection