John, can you recheck what you wrote as his height and weight? I don't think that's what you meant to say.
I don't think your son needs a shake per se. He should be bulking up on protein and calories. It doesn't really matter which form. I always think the less processed food the better, but if your son prefers powdered protein, it is not really dangerous, it just has a lot of unnecessary additives and I find them difficult to digest. It is important to eat some sort of protein within a half an hour of working out to repair any muscular damage that has occurred. Also drink a lot of water and make sure you are getting enough calcium and potassium.
Bulking up is not only a matter of what you eat or how much you lift, but also the way in which you do it. When lifting for bulk fewer reps with more weight is better, and you want to totally burn out the muscle, lift until you don't think you can do any more, than do 1 more, rest, do as many more as you can, rest, do 3 more, rest, 2 more rest, 1 more. Load on so much weight that you can only do about 15 or 20 the first time around. After time you will have to increase this. If you work out every day, the next day let the muscle groups you worked rest and do a different area.
The Most Important Thing is to protect your spine when lifting. Hold you abs tight, and lift your pelvic floor (do this by tightening the muscles you use to stop the flow of urine) and relax your jaw and neck.
Let us know how it goes or if you and your son have any questions.