Seems like the guys that are marginally serious about lifting all drink protein shakes after working out.
The one guy I talked to uses Muscle Milk, Protein Pro. Says he has noticed a difference since using it. Of course, this same guy was drinking a can of chicken broth in the locker room.
First time I have ever seen that.
I've been casually lifting for close to a year now. "Subsistence lifting" I would call it. Not very hard, not very heavy, to try and maintain a certain level of strength in the least amount of time possible. I would like to get a bit more serious.