I use it, and I use a lot of it.
I do cardio almost every morning.
An hour before lifting, I take 60 MG.
On intense cardio (track), I take 80 MG an hour before. On lighter ones I take 60 an hour before.
So I take between 120 and 140 MG a day. I may increment it up.
I suggest you start with 40 mg and see what happens.
So I take between 60