Do you do 500mg caffeine pre-workout? I find caffeine has an odd bell-curve response. Too little: nothing, just a tiny shade too much: jittery and 'not there'. I thought I had high caffeine tolerance but 500mg in one go? I'd be sky-high
Back when I was in college, we'd make a homemade ECA, take GHB postworkout -- all ingredients legally purchased over-the-counter from GNC. When they pulled Eph. and G I didn't have the heart to work out for about seven years:(
1,3 DMAA destroys caffeine in every way. Its everything a pre workout stimulant should be. Extreme focus, strength increase, and sustained energy.
If you get that from caffeine, great. But most get an initial buzz, a little shaky, and then a quick comedown. I think caffeine is good for the metabolism boosting effects but the point of diminshing returns wrt to the other effects is pretty low IMO.
With that said, Jack3d is ridiculously overpriced. Similar products exist 135 scoops for $18 or so compared to jack3d 90 scoops for $25+.
for what it's worth, I find there's a huge difference between Java Stim (Poliquin caffeine product), as opposed to some caffeine tabs at Walgreens. 500mg of the OTC stuff made me feel nauseous, but that doesn't happen with Java Stim at the same amount. It's got two amino acids in there to support the adrenals... so yeah it's a tiny bit more expensive, but well worth it imo.