L carnitine is an amino acid derivative that plays a crucial role in the body's energy production processes. As an injectable supplement, L carnitine has been employed to support various health conditions, including heart L carnitine promotes liver regeneration after hepatectomy by enhancing lipid metabolism Journal of Translational Medicine Springer Nature Link Molecular developments in cell models of fatty liver disease DYSONA Life Science 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 L Carnitine in Mitochondria Encyclopedia MDPI