anything over 2 scoops makes me irritable later in the day, because im wired lol so maybe my asshole peronality just comes out more.
No doubt this stuff is awesome. I liked the germanamine (1,3 dimethylamylamine) so much that I bought some separately - it kicks in about 30 minutes later than caffeine for me, but when I take it separately from caffeine it doesn't do as much. Seems synergistic with caffeine, which is why Jack3d rules.
I also don't sleep well if I take it after 5pm or so.
Here's links where I found mine for Jack3d and 1 3 dimethylamylamine