With the Metformin(Glucophage , Glucophage XR, Glumetza)
it sounds similiar, but is more for people with type 2 diabetes. And it seems that there are side effects with it's usages as well.
I feel that you would see better results with the AP instead of the metformin.(Unless of course you has diabetes and need the metformin)
AP would be my choice for you to stack with the GH.