Are there any energy drinks or other energy booster products out there that actually improve focus and stamina...for say staying up late and concentrating intently and working your ass off? It seems they mostly just give a caffeine buzz.
The stimulant is what improves focus. Most have caffeine USP or the caffeine is simply masked by adding guarana. Either way, it's the caffeine. Nice formula w/o the jitters: http://www.dpsnutrition.net/get_item_man05.htm although the synephrine is useless.
Not so high on AMP anymore? As mentioned before, I added oxiracetam and it's legal MDMA; sure the caffeine is the foundation but you can't negate chocamine and geranamine. I will reserve my comments about Biotest's Spike Shooter, as, I already know how you feel about them. lol