L Carnitine Benefits, Uses, Dosage, Foods, Side Effects Dr. Axe The bright and the dark sides of L carnitine supplementation: a systematic review Journal of the International Society of Sports Nutrition Springer Nature Link L Carnitine for Fat Burning: Boost Energy & Lose Weight Naturally Malook L Carnitine. Fat burning hero or just another hype supplement? If weight loss is your goal, L Carnitine might support your journey, but it's not a magic fix Here's what it actually does