I experimented with a caffeine liquid boost (or something that came in a tube) thing last week... and I think I'll stay away from that type of stuff. 3 minutes afterwards, my tongue felt prickly. Then I could feel something spiky, tingly go through my entire bloodstream. I 1st felt it in my brain, it them went down my arms, through my torso, and on down through my legs. It was poison, I thought I was going to die, seriously. I had to stop a few times while I was walking to the gym to shake this feeling of "heat" off! Felt like I had been rolling around with a cactus. I almost didn't work out, but I was like, fuck it, and proceeded to get that shit out of my system by working the fuck out as hard as I could. (so i guess that was the 'trick' :lol good stuff)
I think I'll stick to shit like Olive oil, water, and my own adrenaline for now on!