Supplements don't replace the workbut they can support it L Carnitine helps your body turn fat into usable energy, so you can push harder and recover better. Consistency first. Supplements second. Results Acetyl L Carnitine: Benefits and Side Effects Gene Food 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 1000mg Energy, Metabolism & Fat Burning L Carnitine Benefits, Uses, Dosage, Foods, Side Effects Dr. Axe