which one does everyone think is the most effective? Id be interested in people's opinions as there's so many and much hype and bullshit around them. Sometimes i think i'd be better off drinking strong coffee and green tea...
No side effects...
Im 16 and taken it and ive been having best workouts ever...
Only thing may be that you might lose some sleep, if this happens then take it well before you sleep, like for morning lifts and such