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 The Benefits (and Limitations) of L Carnitine for Fat Loss Is L Carnitine safe for athletes at doses up to 6000 mg day? Consensus L Carnitine vs L Arginine: Understanding Their Differences and Benefit Fitness Health