excercising period should speed up your metabolism shouldn't it? lots of caffeine too, i'd imagine. the pills are pretty ridiculous, and i agree, should be avoided...but I broke down and got an energy supplement today at GNC..."5 hour energy" 2 ounce shots. chose them because they had the lowest amount of caffeine, essentially just megadoses of B vitamins and taurine i think. worked pretty well i'd say...i was able to do both more reps, heavier weights, and go for an hour nonstop.
then i had to move a bed (in pieces of course) to the garage to be thrown away later...no way i could have done all that and still be energized right now the way i've been dragging ass lately.
i think these will do for when i dont feel like the hassle of a b-12 injection, which is most of the time. i just don't like shots