L-ISOLEUCINE HAS BEEN IDENTIFIED AS ONE OF A GROUP OF AMINO ACIDS DEFICIENT IN MENTALLY AND PHYSICALLY ILL PATIENTS. LEUCINE (LIKE ISOLEUCINE) IS ALSO FOUND TO BE RELATIVELY DEFICIENT IN MENTALLY AND PHYSICALLY ILL PATIENTS.ISOLEUCINE, LEUCINE & VALINE ARE REPORTED TO BE ESSENTIAL TO RESTORE POSITIVE NITROGEN BALANCE IN HUMAN SUBJECTS.THESE BRANCHED CHAIN AMINO ACIDS (BCAAS) BEING LIVER INDEPENDENT,ACTS AS A READY SOURCE OF ENERGY, IN CONDITION OF DEPLETION. THEY OFFER MYOCARDIAL PROTECTION BY STIMULATING THE FORMATION OF ACETYL- OB, AND SUCCINYL COA THEREBY ENSURING RECOVERY OF OXIDATION METABOLISM."