I know the thread is very old but I want to contribute with my exp..today I did my workout on an empty stomach(as usual), I took 50 mg of caffeine in pill at 5:15 a.m and I made a BCAA complex that contains 2400 mg of glutamine, leucine, isoleucine, arginine and valine(not much but didn't have money at the time) .. I took about 125 to 200 ml of this at 5:40 and got to the gym ... Started my workout with HIIT, the beckham sprinting workout to be precise, for twenty minutes; during that time I drank another 125 ml of the BCAA complex, felt good, then did my back and triceps routine, I felt awesome, great pump ( arginine probably helped here) and focus was there as well, after got home took my whey immediately and felt that anabolic state of hunger. For me I don't k ow it it wslas the caffeine or the BCAA's ( I have worked only on caffeine and didn't feel as good as today) or the placebo but definetly felt great I'm looking forward to working out tomorrow, what do u guys think placebo, BCAA, or placebo and caffeine or BCAA and caffeine?