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 Fast&Up L Carnitine 3000 mg Triple Action Formula for Faster Fat Burn Acetyl L Carnitine (ALCAR) Supplement for Horses Mad Barn L Carnitine for PCOS: Everything You Need to Know PCOS Nutrition Center Is L Carnitine safe for athletes at doses up to 6000 mg day? Consensus