Dietary allicin reduces transformation of L carnitine to TMAO through impact on gut microbiota ScienceDirect Characterization of TMAO productivity from carnitine challenge facilitates personalized nutrition and microbiome signatures discovery Microbiome Springer Nature Link Dietary allicin reduces transformation of L carnitine to TMAO through impact on gut microbiota ScienceDirect TMAO: Why It Increases & Factors That May Reduce TMAO levels SelfDecode Labs