From the web -
Causes of low globulin level can be caused by malnutrition, liver disease, severe burns, or severe kidney disease.
One of the ways to improve globulin level is to consume high protein foods rich in globulin such as soy, hemp seeds, green leafy vegetables, whole grains, eggs, seafood and red meat.
Supplements and Medication
Depending on the clinical report of your blood profile, your doctor may prescribe globulin supplements and medication to raise globulin count to its normal range.