if you are using gh, i would most certainly stay on it during PCT. GH has nothing to do with AAS and how steroids work. you can continue on with your gh into PCT and after. it will only help you continue to grow and give you a better shot at holding the gains you made. if you are not using gh currently and only plan to use it during PCT, then no, i would not use it just for PCT. it will not make much of a difference, using it for only a few wks. 

another peptide worth looking into for use during pct is igf lr3. this is a peptide that can be used for short bursts. in fact, that is exactly how it is meant to be used. it will give you great pumps and will certainly help you hold onto your gains. for use during PCT, i would suggest 35-50mcg of real igf lr3, taken either pre or post workout on your training days. if you are using gh, igf can be stacked with it to create an even stronger effect.