it's very hard to add a single inch to anything in such a short amount of time if you aren't a beginner, or aren't on a steroid. hyperdrol is an aromatase inhibitor, so its primary use is to block the conversion of testosterone to estrogen. this is mainly a large factor following an anabolic steroids or PH cycle when your synthetic test quickly transforms into estrogen. the result is bloat, gyno, loss of gains, etc.
unless you're coming off of a cycle, i wouldn't mess with your endocrine system. i did a pretty big natty stack a few months ago and I think it negatively affected my endocrine system. i had a rebound. still waiting on the bloodwork to confirm.
may be something to consider, however. but even that brings potential health risks. make sure your diet is in check first. all your results will come from proper goal-oriented eating habits, supplements second.