What is the best way to add weight to my teenage son for football season?

My son is 14 years old and I would like to make sure that he is as healthy as possible during football season. Does anyone know a good supplement or protein shake to give to him to help him gain weight and muscle?What is the best way to add weight to my teenage son for football season?
My son plays football as well, (same age)and don't get caught up with all the hype around name brand protein shakes. Whey protein is good, and powdered milk has a high protein concentration.


He eats lots of peanut butter and jam sandwiches, rice, potatoes, nuts... carbs.. quick energy.


';The situation is encouraged by the extraordinary vigor of the powdered protein supplement industry in the weight training and bodybuilding markets. Skim milk powder can supply all the extra protein required -- and at a fraction of the price of some expensive supplement brands.';


Here's a helpful site.What is the best way to add weight to my teenage son for football season?
protein drinks high in calories will do it
bananas with milk will help him gain weight . if u can u can give him protein supplements which r sold in markets . esp.. in sports shops