L Carnitine Benefits for Fat Burning and How to Use ICONFIT Carnitine: Genetic Variants Affecting Mitochondrial Energy and Health Losing weight with L carnitine supplements. Yes or no? L Carnitine Safety Dosing Consensus Potential Adverse Effects of L Carnitine Marnys 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