This amino acid is found in the heart muscle, white blood cells, skeletal muscle and central nervous system. It has a protective effect on the brain, particularly when the brain is dehydrated. It has been used for anxiety, hyperactivity, poor brain function, and seizures. Can be useful for those with atherosclerosis, edema, hypertension and hypoglycemia. It is vital for proper utilization of sodium, potassium, calcium, and magnesium, shown to play a particular role in sparing the loss of potassium from the heart muscle.