Characterization of TMAO productivity from carnitine challenge facilitates personalized nutrition and microbiome signatures discovery Microbiome Springer Nature Link Characterization of TMAO productivity from carnitine challenge facilitates personalized nutrition and microbiome signatures discovery Microbiome Springer Nature Link 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