Like Anthrax said..your not going to get crazy gains off of it. However, if you are zinc deficient which many many people are without knowing it..it will boost test levels a bit...I took it for a month and if nothing else it knocks you out for the night...but id buy a diff brand if i were you...theirs similar products from diff brands that are a bit cheaper...just make sure you avoid calcium when taking it and take it before bed