While I believe in the right supplements a little more than most around here, one such supplement I refuse to support are weight gainers
Diet is so so so important, and solid food will benefit you much more than a weight gainer like that. 1,250kcal is a nice number for one shake, but if you can afford that, you can afford slightly more food a week to get that from good food.
Now my knowledge of growth hormones is very little, but when you are taking hormones (that will always be synthetic versions of the real thing) your body tends to rely on that, so after a long time on testosterone for example, you'll find that your body begins to need it, and when you stop taking it, your natural testosterone levels will be much much lower than before you started taking it.
A part of me wants to say growth hormones pretty much are steroids, so the side effects will be very similar if not identical depending on the hormone you are taking.
My advice for you would be to train naturally, for a while, a long while, and by that I mean a few years. It will take you that to get anywhere near your natural limits. If after that you still find yourself wanting more and not happy with your progress, then give it another thought, but until then, it really isn't worth the gamble on your health. Get yourself a spot on diet, which anyone here will help you with, maybe some whey protein if you really want some extra easy calories, and maybe some creatine.
Then as Morba says, "Eat Like a Horse, Train Like a Demon, Sleep Like a Baby"
EDIT - Quite a few posts since I started writing that lol, anyway natural test boosters such as Tribulus are very hit and miss, some people react brilliantly to it, but others won't notice a difference. And I do know someone who got a written warning at their job shortly after taking Tribulus, it made him a very very angry man

To be honest, just knock one out before the gym, save your money and get similar benefits
