So after taking jack3d for 6 months I know I have become much more tolerant seeing how I need to take 4 scopes just too feel a difference. Today I got Neurocore as a substitute seeing how the guy at gnc said it was once of the best pre workouts on the supplement. He also said to wait a couple days before using it, until all the remnants of jack3d are completely flushed out of my system. Lastly what are the best pre workouts any of you guys tried?
I don't understand?
I don't understand?