Elucidation of an anaerobic pathway for metabolism of l carnitinederived butyrobetaine to trimethylamine in human gut bacteria PNAS Full article: Gutheart axis: emerging therapies targeting trimethylamine N oxide production Full article: Gut microbes with the gbu genes determine TMAO production from L carnitine intake and serve as a biomarker for precision nutrition Intestinal microbiota metabolism of l carnitine, a nutrient in red meat, promotes atherosclerosis Nature Medicine Dietary allicin reduces transformation of L carnitine to TMAO through impact on gut microbiota ScienceDirect