Dietary allicin reduces transformation of L carnitine to TMAO through impact on gut microbiota ScienceDirect L Carnitine Male Enhancement: What the Evidence Shows for Energy, Sperm Health, and Performance I take L Carnitine for weight loss, it says not to take more then 1g per day, but I read online that i should have 2 4g per day to lose weight. What is Characterization of TMAO productivity from carnitine challenge facilitates personalized nutrition and microbiome signatures discovery Microbiome Springer Nature Link Study reveals how red meat harms the heart. A species of gut bacteria, more abundant in red meat eaters, is key in turning a dietary nutrient called carnitine into TMAO which promotes blood clotting