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: Health Benefits, Side Effects and More What is L Carnitine, and what does it do? Fit Nutrition Australia Efficacy of L carnitine supplementation on frailty status and its biom CIA Dove Medical Press