Full article: The bright and the dark sides of L carnitine supplementation: a systematic review L Carnitine Male Enhancement: What the Evidence Shows for Energy, Sperm Health, and Performance 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 Characterization of TMAO productivity from carnitine challenge facilitates personalized nutrition and microbiome signatures discovery Microbiome Springer Nature Link