I think it's the taurine, I drank a Red Bull once and I was good to go for a few hours, no afternoon slowdown at all, then in the middle of the night I woke up hungry for everything in the refrigerator........
Folgers Classic Roast coffee crystals (instant coffee). I do not get the jitters/nervousness as with regular coffee. It does improve my focus (reading/computerizing) and I'll have a cup an hour before the gym for stamina. Note: Your results may differ (as with all products).
AMP is good but you attenuate to it quickly....Venom by ALRI is good shit too. *whoooo* I've tried Piracetam Oxiracetam and Pramiracetam, Piracetam is what I prefer so far, mostly because it's cheap and effective. Pram was a waste of money, that shit is expensive and hard to get (used to be at least). It worked but it wasn't anything to write home about, especially when the alternatives are cheaper. I used Pramistar. Maybe I had a bad batch.