Personally, I took the maximum dosage of 8 per day. I think it says 3 in the a.m. and 3 with lunch on the bottle but in the literature that comes with it, it says for severe fatigue you can take up to 8 per day.
It might be a good idea to start out with just one and see how it works though, especially if you have a sensitive system or are nervous about how it will affect you.
But just to let you know, I didn't feel weird or jittery or anything like that.