Simultaneous quantification of trimethylamine oxide and its precursors from gut microbial metabolic pathway Systematic investigation of the relationships of trimethylamine N oxide and l carnitine with obesity in both humans and rodents Food & Function (RSC Publishing) Full article: Gut microbes with the gbu genes determine TMAO production from L carnitine intake and serve as a biomarker for precision nutrition Dietary allicin reduces transformation of L carnitine to TMAO through impact on gut microbiota ScienceDirect