I can't answer for Vast but I'm going to pretend I'm Vast answering for Dat.
If the frag is inexpensive to you and good quality then adding it to a GH run should exacerbate the fatloss.
So lets see. Frag is about 15 aminos lonq which is about 1/13th the size (assumed weight) of GH (which is 191 aminos).
Nutropin reveals that 1 iu of their GH is equal to 333 mcg. So if you take 1/13 of 333mg of frag with each iu of GH you will double the fat burning power of GH. Ceteris paribus of course.
So if you take about 100mcg of frag per 1 iu of GH you will increase GH's fat reducing power by a factor of 4.
Not bad.
How about 2iu of GH + 200mcg of frag in the morning and 2iu of GH + 200mcg of frag in the evening?
No single hormone, no single aspect of body reconstruction be it cardio, diet, weight-lifting, hormone or supplements should be expected to carry the entire load of enabling you to reach your goal.
If something makes a positive contribution then that is a good thing.