I used to be hooked on the Tesco cheap Kick energy drink. Used to sink a bottle during my workout at the gym, did give me the edge but that continued for the rest of the day!! Lots of sleepness nights as well! lol
Can't stand the smell of the stuff now, but I do like the occasional can of berry Relentless.
I have been through detox and have to say i'm now off the source!
