I'm not sure who has actually tried this and who hasn't, but I've actually tried the following:
GH pre workout
GH + insulin pre-workout
Insulin pre-workout
All were done with an intra workout shake consisting of aminos and dextrose.
I monitored blood sugar, and how I felt.
Results:
GH pre-workout: lethargic feeling, training intensity down. Blood sugar was too high for my comfort while taking in carbs/aminos during the workout
GH + Insulin pre-workout: More lethargic. Blood sugar all over the place, up and down.
Insuiln pre-workout: Amazing pump, great workout intensity, more stamina. Just need to ensure that I was taking in enough carbs/aminos to cover the insulin dose. I use Humulin R.
I know that knight was talking about cascade affects of GH. He's right, many peopel forget this.
However, the GH molecule itself makes it into the blood rather quickly, and then binds to receptors or hits the liver and undergoes metabolism. While the GH molecule itself is present, it's antagonizing the effects of insulin...this is why blood sugar goes up. Add sugars and aminos to this and the pancreas has to dump more and more insulin to lower sugar. So, I tried taking the GH with insulin. The insulin dose I started with was 10iu. This almost did nothing with the GH present and the carbs aminos. I worked up to 20iu once and this helped keep my BG in check during the workout, but I felt like shit - tired and lethargic.
The cascade effects of GH (IGF-1 conversion) take time, as Knight said. So if taking GH pre workout, I'd suggest only some amino's during the training, not carbs. Let the GH mobilize fat and don't cause yourself blood sugar issues.
I now use insulin (if at all) pre workout with an intra shake, and GH all in one dose pre-bed, or split dose pre-bed and pre-workout (but without intra workout carbs if I do this).
My .02c