muscle gains on GH are a secondary effect, thats why you didnt notice anything for 2 months. Add in the fact your only 24 and should be producing plenty of natural GH my opinion is your wasting your money, but im sure your source appreciates the business.
P.S. Gh doesnt GIVE you anything, it helps promote muscle growth in an optimal environment where proper diet and exercise protocols are followed. And FYI, Ive been playing this game for over 25 years.