I would see a doctor before adding any supplement. They can do blood tests too to see if his levels are deficient, and if any is needed or would be dangerous. Too much protein puts added stress on the organs, especially the kidney's to rid the ketones in the urine, and this can cause dehydration amongst other problems. Your body can only assimilate 23 grams of protein at a time anyway. Another factor, is some of these bodybuilding proteins, at least in the recent past, had steroids in them, and a bunch of other potential harmful chemicals, herbs, and my doctor had warning signs about creatine, a popular added supplement in many.