as far as preowrk out drinks go ive tried alot of gnc products....noxplode, superpump250, supercharge, trac, fast twitch, nanovapor, NOZ IV i would say superpump250 and fasttwitch worked well for me...i got stronger and more engery to work out. alot of hype was given to noxplode but to me it didnt realy work that well.....one thing i would like to mention tho is that for some reason after i take the preworkout drinks (currently taking NOZ IV) i gag like im about to throw up but dont. I know im not going to but i gag every once in a while in the gym its really strange