Prime is not a Test Booster, so it won't hurt to take that and Animal Stak at the same time. IMO there are better test boosters out there than Animal Stak though. TestoPro, Stoked, Diesel Test Hardcore/Pro Cycle, Sustain Alpha...just to name a few. You're also overpaying on the Nitrotech for pre-workout. Get some BCAA's or just eat a high protein whole food meal 1.5-2 hours before training. Be sure not to take your Jack3d too close to your pre-workout meal to diminish it's effects at all.