L Carnitine Role of carnitine in disease Nutrition & Metabolism Springer Nature Link 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 Frontiers Role of Carnitine in Non alcoholic Fatty Liver Disease and Other Related Diseases: An Update Comprehensive review of the expanding roles of the carnitine pool in metabolic physiology: beyond fatty acid oxidation Journal of Translational Medicine Springer Nature Link