Does L Carnitine Really Work? An Honest Guide The Science of Good Health L Carnitine Linus Pauling Institute Oregon State University 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. L Carnitine for Fat Burning: How It Really Works (Without the Hype) Is L Carnitine the Key to Fat Loss? Protyze