Jack3d was banned, because it is one of the most powerful pre workouts in existence. After the FDA made DMAA illegal in 2012, Jack3d had to remove its pre workouts from the shelves, because it contained a hefty dose of this powerful stimulant. Thankfully, after reformulating their pre workout, Jack3d is back on the shelves with a more legal ingredient lineup. It's still difficult to find, because Amazon doesn't sell it, but you can buy it on other places online. Read more