High l Carnitine Ingestion Impairs Liver Function by Disordering Gut Bacteria Composition in Mice Journal of Agricultural and Food Chemistry Should I Take Acetyl L Carnitine or L Carnitine HealthAid Branched chain amino acids and l carnitine attenuate lipotoxic hepatocellular damage in rat cirrhotic liver ScienceDirect Early research into L carnitine was often cited as underwhelming, showing negligible changes in muscle carnitine content and fat loss outcomes. However, these findings may have been limited by a short study window