Welcome to the board. At your age, your most common answers are going to include eating more, sleeping 8 hours, and lifting hard.
One supplement that can help to put some additional size would be a form a creatine, but at your age you've already got everything going for you.
What about protein?
which creatine do u think is best?
What about protein?
What are EFAs? and which creatine would be good? Really new to supplements.. dont know to much. My friend is using anabolic halo with good results..