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. Carnitine: the claims and why it may not work L Carnitine Liquid Benefits Explained: A Guide The Science of Good Health L Carnitine Vitamin Supplement for Energy and Metabolism Boost L Carnitine 1000mg Energy, Metabolism & Fat Burning L Carnitine Benefits for Fat Burning and How to Use ICONFIT