Corebolics L Carnitine Energy And Recovery Catalyst Liquid L Carnitine Energy, Metabolism & Fat Burning Acetyl L Carnitine: Benefits, Forms, Dosing, and Side Effects Dr Brad Stanfield L Carnitine: Benefits, Uses, Side Effects, and More L Carnitine: Benefits, Uses, Side Effects, and More Govinda Lifecare 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.