BIG BLAST is the most economical source, and incidentally, the only protein powder that contains it. The combination of whey isolate, whole egg, P12 creatine NO2, digestive enyzmes and hydrolyzed rice syrup all add up to the ultimate mass drink. If you can afford the straight stuff, go for it, but on an ongoing basis (which is how any food source needs to be taken) that'll start to take its toll, whereas the BIG BLAST is pretty reasonable. (Maybe a buck or two a pound more than other commercial brands. And it tastes good.