Well I should be getting a bottle of it soon here anyday now, and I have experienced HGH supplements before so I am eager for it. But really other than a decent pre-workout and your diet, nothing should be needed.
Results of your workouts will be based on your intensity, dedication, and diet. At most supplements can give you a 5-10% boost depending on the supplement, the desired effect, and your standing in training.(Obviously someone who just started lifting will make great gains regardless, someone who just started losing weight will get great results off the bat, etc.)
Stacking is over rated, food is underrated. Remember that.