I'm also concerned about this, I'm the typical tall skinny teenager, I want to get big like everyone else, I just want nice big muscles, not bulk, and tone.. I do NOT want a ton of fat added with this!! A bunch of guys on our football team I talk to and see at the gym are fat + bulky and they tell me to eat a ton or my workouts wont do shit etc, but I don't want to end up looking like them ><