Fig. 1From: Characterization of TMAO productivity from carnitine challenge facilitates personalized nutrition and microbiome signatures discoveryThe oral carnitine challenge test (OCCT) can be used to estimate potentially harmful plasma TMAO levels from carnitine intake. a Schematic of the OCCT procedure and study protocol. b The OCCT curves for vegetarians and omnivores pre- and post-carnitine supplementation. c Fasting plasma TMAO levels in vegetarians and omnivores pre- and post-carnitine supplementation. d Classification of low- and high-TMAO producers based on a cut-off value of 10 μM for TMAOMAX in the OCCT. e Fasting plasma TMAO levels in low- and high-TMAO producers pre- and post-carnitine supplementation. Data shown here were analyzed by paired and unpaired nonparametric test accordingly; bars represent the mean ± S.E.M for the indicated groupsBack to article page