If you could inject something localy in the fat to make the said fat disapear, everyone would use that shit. And people would make big bucks selling it.
From what i know, HGH frag has to be used pre cardio on a completly fasted state in order to work. So its pretty inconvinient to use. And even if you do use it the proper way, i havent seen anyone who had good results. Those who did probably were in a calorie deficit in the first place and add to that the fasted cardio you get fat loss... How much did the frag contributed to that ? No way to tell but very little if anything imo.
If HGH is out of your budget, taking a GH secretagogue (CJC and GHRP combo) before fasted cardio is a much better way to release from fat, add to this a adregenic stimulant like yohimbine HCL or clen and you might get a significant effect (needless to say you STILL need to be in a net calorie deficit).