well although i agree somewhat with you, when comes to gear u never know what u put in your body,most of the shit ppl inject is from some underground lab,where quality control is somewhat shaddy at best,look at the kingtrophin fiasco,they where selling good shit untill ppl started to get vial with sugar on them!!
As for gh,certain signs lets u know where exactly the product is going... over time weight loss is undeniable,cts,the sleep feeling an hour after injection,etc..
Unless u have access to top notch of the shelf pharma grade product i think u cant really know how real your product are unless you try them.I have try quite a few underdose products out there, just part of the game,now i buy somewhere else.just my 2 cents.