Gh is unlike any other out there bro. as you may know, GH increases the number of muscle cells. with this in mind, gains will be permanent, but as you age obviously cells decrease in number.
on a side note, fina increases the size of the cells, so GH and fina is a killa combo esp filling the new and enlarged cells with plenty of Test..hehehe
hope this was helpful !
2ez (i'm not a vet nor guru...just 2ez giving his 2cc's..hehe)