L carnitine is a naturally occurring amino acid structure that is made in the human brain, liver, and kidneys. L carnitine plays a critical role in energy production, as it converts fat into energy. Full article: Effects of high dose L carnitine supplementation on diaphragmatic function in patients with respiratory failure: A randomized clinical trial Did you know L carnitine, a vital amino acid, is naturally produced by your body and found in various foods? While acetyl L carnitine (ALCAR) can be a beneficial supplement for some, most people get L Carnitine (Orange) Outlastlabz Liquid L Carnitine 3000: Metabolism & Energy Support Cutler Nutrition L Carnitine Benefits, Uses, Dosage, Foods, Side Effects Dr. Axe