Carnitine: the claims and why it may not work L Carnitine Linus Pauling Institute Oregon State University 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 Side Effects & Risks Association between red meat consumption and the risk of cardiovascular disease: An important role of L carnitine metabolites Prevention Observatory of the Montreal Heart Institute