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 N Methyl L lysine hydrochloride Chem Impex Role of L carnitine in female infertility Reproductive Biology and Endocrinology Springer Nature Link The Role of l Carnitine in Mitochondria, Prevention of Metabolic Inflexibility and Disease Initiation