Receive any L-carnitine supplement in the last 6 months Participate in any other research project History of liver and kidney disease Pregnancy and lactation Any allergy to L-carnitine Patients who stayed in the ICU for < 72 hours Patients who receive parenteral nutritional support Patients treated with different drug regimens from the routine ICU protocol Patients will be ongoing treatment with cisplatin, phenobarbital, phenytoin, pivalic acid, valproic acid, ifosfamide, and levetiracetam Any gastrointestinal disorders that lead to stopping enteral feeding for more than 48 hours

Receive any L-carnitine supplement in the last 6 months Participate in any other research project History of liver and kidney disease Pregnancy and lactation Any allergy to L-carnitine Patients who stayed in the ICU for < 72 hours Patients who receive parenteral nutritional support Patients treated with different drug regimens from the routine ICU protocol Patients will be ongoing treatment with cisplatin, phenobarbital, phenytoin, pivalic acid, valproic acid, ifosfamide, and levetiracetam Any gastrointestinal disorders that lead to stopping enteral feeding for more than 48 hours

Receive any L-carnitine supplement in the last 6 months Participate in any other research project History of liver and kidney disease Pregnancy and lactation Any allergy to L-carnitine

Receive any L-carnitine supplement in the last 6 months Participate in any other research project History of liver and kidney disease Pregnancy and lactation Any allergy to L-carnitine