Full article: Gut microbes with the gbu genes determine TMAO production from L carnitine intake and serve as a biomarker for precision nutrition There's a molecule your gut quietly produces every time you eat red meat, eggs, or dairy, and most doctors never test for it. It's called TMAO. And it's been linked to a Decoding TMAO in the Gut Organ Axis: From Biomarkers and Cell Death Me DDDT Dove Medical Press Acetil L Carnitina