It increases your blood sugar which can increase insulin resistance if left unchecked for a long span of time. Ya there is a connection between increased GH levels and prolactin. And there is also a connection between increased prolactin reducing Testosterone levels. If it were the case that the amount it hindered you was so significant that it severely hindered your progress then there would be no natural competitors using GH though, so I feel like that’s just looking for problems with the compound at that point. Greatly increased GH and IGF-1 levels will outweigh negligibly suppressed Testosterone levels (if it even occurred), otherwise there would be no point of taking anything GH related unless you were on gear.