L Carnitine Bodybuilding.com L Carnitine Liquid 3300mg for Fat Burn and Energy Boost Try L Carnitine 3000 from @1upnutrition if you want to turn up the heat on your cut. It helps the body convert stored fat into energy by transporting fatty acids into the mitochondria 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