L Carnitine: Benefits, Uses, Side Effects, and More Carnitine, Boost Your Energy, Weight Loss and Health Uses. L Carnitine Uses, Benefits, and Side Effects thegoodbug l Carnitine Supplementation in Recovery after Exercise The Role of l Carnitine in Mitochondria, Prevention of Metabolic Inflexibility and Disease Initiation If you are like a lot of people, you may have never heard of carnitine but this important nutrient is critical for our body's ability to optimally burn fat required for energy.