I have to switch it up every month or jug as it dosnt work for me. I know someone who works for bsn and there coming out with a new product next month that he says to be awesome said hell bring samples next time he comes in so have to see. I normally jump between jacked, body rush, and assault. All great for me.

i dont know a whole lot about this stuff but in doing a little research all this stuff is made up of a few basic things arginine and creatine some beta and tons of caffine. i dont do caffine and have found that agmatine does me just fine pre workout with out all the extra crap these companies put into it for flash. if i am missing something i am certain its not all the caffine they put in there. try some the agmatine and creatine or check this place out you can get stuff without all the extra crap you dont need. e.g. dies and flavors, caffine.

I have tried a lot of diffrent pre workout supps and they all seem to wear off with time. Your body gets accustomed to them and there effects diminish with time. With that said jack3d is my fav of the bunch. Best way to use em is to cycle on and off this way you dont grow a tolerance to them.