Differential effects of oral and intravenous L carnitine on serum lipids: is the microbiota the answer? Identification of TMAO producer phenotype and hostdietgut dysbiosis by carnitine challenge test in human and germ free mice Gut Linking anaerobic gut bacteria and cardiovascular disease Nature Microbiology Revisiting the Role of Carnitine in Heart Disease Through the Lens of the Gut Microbiota Full article: Gut microbes with the gbu genes determine TMAO production from L carnitine intake and serve as a biomarker for precision nutrition